WO2005093403A1 - 磁性体濃度計測装置、検出感度向上方法、ゼロ点補償方法及びゼロ点補正方法 - Google Patents
磁性体濃度計測装置、検出感度向上方法、ゼロ点補償方法及びゼロ点補正方法 Download PDFInfo
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- WO2005093403A1 WO2005093403A1 PCT/JP2004/016523 JP2004016523W WO2005093403A1 WO 2005093403 A1 WO2005093403 A1 WO 2005093403A1 JP 2004016523 W JP2004016523 W JP 2004016523W WO 2005093403 A1 WO2005093403 A1 WO 2005093403A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
Definitions
- Magnetic substance concentration measuring device detection sensitivity improvement method, zero point compensation method and zero point correction method
- the present invention relates to a magnetic substance concentration measuring device for measuring the concentration of a magnetic substance contained in a fluid, a detection sensitivity improving method, a zero point compensation method, and a zero point correction method.
- some sliding devices provided with a pipe for flowing a fluid may be worn by sliding, and when such sliding device is worn by sliding, the pipe may be worn. Since magnetic material such as iron flows, it is necessary to measure the concentration of the magnetic material contained in the fluid of the piping to understand the wear of the sliding equipment.
- a magnetic substance detection device for measuring the concentration of a magnetic substance is shown.
- a minute gap is provided in a part of an annular core provided with a winding, and the gap is formed by a magnetic substance. Some of them detect a magnetic material by detecting a change in impedance of the annular core when passing through.
- a core having two gaps at different distances is provided with a pair of coils located on both sides of the two gaps, and each coil is used when the magnetic material passes through the two gaps. There is one that detects the impedance of the above and corrects the effect of the temperature change by taking the difference between them (for example, see Patent Document 1;).
- a magnetic field applying unit and a magnetic measuring unit including a magnetic sensor of a superconducting quantum interference device, and detects only a magnetic field of a magnetized magnetic component for example, see Patent Document 2; ).
- Patent document 1 JP-A-9-236642
- Patent Document 2 JP-A-10-268013
- a device for measuring the concentration of a magnetic substance is affected by disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise, and the influence of the disturbances over time. That the concentration of the magnetic substance in the fluid cannot be measured continuously. was there. Further, the device for measuring the concentration of the magnetic substance has a problem that the concentration of the magnetic substance on the order of several ppm cannot be detected because the detection sensitivity of the magnetic substance is low. Further, there is a problem that the zero point is shifted due to aging or various reasons.
- the magnetic field applying means and the magnetic measuring means are provided as in the above another example, a cooling medium such as liquid nitrogen is required, and the magnetic measuring means includes a magnetic sensor of a superconducting quantum interference device.
- a cooling medium such as liquid nitrogen
- the magnetic measuring means includes a magnetic sensor of a superconducting quantum interference device.
- the present invention has been made in view of such circumstances, and a magnetic substance concentration measuring apparatus and method for continuously measuring the concentration of a magnetic substance in a fluid and improving the detection sensitivity of the magnetic substance.
- the purpose is to provide. It is another object of the present invention to provide a magnetic material concentration measuring device capable of correcting a deviation of a zero point, a zero point compensation method, and a zero point correction method.
- the present invention provides an actual measurement LC oscillation circuit in which a first coil is arranged near or in a fluid so as to detect a change in frequency corresponding to the magnetic substance concentration in the fluid, and a magnetic substance in the fluid.
- An LC oscillation circuit for correction in which the second coil is arranged at a position where the influence of the magnetic material in the position or fluid is small, which is not affected by
- the present invention is directed to the magnetic substance concentration measuring device thus configured.
- the measured data is processed from the oscillation frequency for measurement and the oscillation frequency for correction by each of the LC oscillation circuits and is converted into the concentration of the magnetic substance.
- Physical strength It is possible to constantly remove disturbance and make corrections to continuously measure the concentration of magnetic substances.
- the concentration of the magnetic material can be measured with a resolution of the order of several ppm.
- the second coil of the LC oscillation circuit for correction is placed in a position where it is not affected by the magnetic substance in the fluid or in a position where the influence of the magnetic substance in the fluid is small!
- the concentration measurement of the magnetic material can be performed with a simple configuration. Furthermore, since the first coil of the actual measurement LC oscillation circuit is arranged near or in the fluid, it is easy to configure the LC oscillation circuit without being affected by the arrangement of the piping through which the fluid passes. Can be arranged. Furthermore, the LC oscillation circuit can be configured at a low cost by eliminating the use of a cooling medium and reducing labor, and by eliminating the need for expensive components such as superconducting quantum devices.
- the difference between the measurement data and the influence of the magnetic material are used as a reference based on the difference between the measurement data. Increase the apparent numerical ratio of the amount of change due to the influence of the magnetic material, improve the detection sensitivity of the magnetic material, and consequently detect even if the concentration of the magnetic material is very small. be able to. Furthermore, the difference between the measured data is calculated by the processing means from the oscillation frequency of the actual measurement LC oscillation circuit and the oscillation frequency of the correction LC oscillation circuit, and the difference is converted into the concentration of the magnetic substance. Can be measured continuously. Furthermore, since the processing can be performed with a minimum number of parts, the cost can be reduced.
- the present invention provides an actual measurement LC oscillation circuit in which a first coil is arranged near or in a fluid so as to detect a change in frequency corresponding to the magnetic substance concentration in the fluid, and a magnetic substance in the fluid.
- the LC oscillation circuit for correction in which the second coil is arranged at a position where the influence of the magnetic material in the position or fluid is small and the position is not affected by the magnetic material in the fluid
- An LC oscillation circuit for comparison in which the third coil is arranged at a position where the body is less affected, The difference between the measured data is determined from the oscillation frequency of the LC oscillation circuit for measurement and the oscillation frequency of the LC oscillation circuit for comparison, and is used as the first data.
- the oscillation frequency of the LC oscillation circuit for correction and the LC oscillation for comparison are determined.
- the difference between the measured data and the oscillation frequency of the circuit is obtained as the second data, and the difference is obtained from the first data and the second data to remove disturbance and the difference between the first data and the second data is used as a reference.
- the present invention relates to a magnetic substance concentration measuring device configured to compare the data difference with the change amount due to the influence of the magnetic substance to improve the detection sensitivity of the magnetic substance.
- the LC oscillation circuit for measurement, the LC oscillation circuit for correction, and the LC oscillation circuit for comparison oscillate at different oscillation frequencies, respectively. Since the data difference is compared with the change due to the influence of the magnetic material based on the data difference, the visual ratio of the change due to the influence of the magnetic material is greatly increased, and the detection sensitivity of the magnetic material is improved. As a result, even if the concentration of the magnetic substance is very small, it can be more suitably detected. Further, since the processing is performed by taking the difference twice, it is possible to easily adjust the data difference in comparison with the variation due to the influence of the magnetic material.
- the disturbance of the magnetic force in the fluid is further removed by the oscillation frequency for comparison, so that it is more accurate. It can be corrected.
- the present invention provides an LC oscillation circuit having a first coil and an LC oscillation circuit having a second coil, wherein one of the first coil and the second coil is influenced by a magnetic substance in a fluid.
- the oscillation frequency with the influence of the magnetic material by the LC oscillation circuit of the first coil and the oscillation frequency without the influence of the magnetic material by the LC oscillation circuit of the second coil When the difference between the measured data is obtained as the first data and the magnetic material is applied to the second coil, the oscillation frequency without the effect of the LC oscillation circuit of the first coil and the LC oscillation circuit of the second coil The difference between the measured data and the oscillation frequency affected by the above is calculated as the second data.Then, the data difference between the first data and the second data is calculated to compensate for the deviation of the zero point and to determine the concentration of the magnetic material. It relates to a magnetic substance concentration measuring device configured to be obtained.
- the oscillation frequency of the LC oscillation circuit of the first coil affected by the magnetic material
- the difference between the measured data and the oscillation frequency without the influence of the magnetic material by the LC oscillation circuit is obtained as the first data.
- the difference between the measured data is calculated from the oscillation frequency of the first coil, which is not affected by the LC oscillation circuit, and the oscillation frequency of the second coil, which is affected by the LC oscillation circuit.
- the amount of change due to the influence of the magnetic material including the deviation of the zero point is obtained as the second data, and further, the difference between the first data and the second data is obtained.
- the concentration of the magnetic material is determined. Can be measured.
- an LC oscillation circuit having a first coil and an LC oscillation circuit having a second coil are selectively disposed in a fluid in one or both of the first and second coils. It is configured so that it can affect the magnetic material of
- a magnetic material is applied to both the first coil and the second coil to determine the difference between the measurement data from the respective oscillation frequencies, the difference between the measurement data is recognized as a zero point, and the deviation of the zero point is corrected.
- Magnetic substance concentration measuring device Magnetic substance concentration measuring device.
- an LC oscillation circuit having a first coil and an LC oscillation circuit having a second coil are selectively disposed in a fluid in one or both of the first coil and the second coil. It is configured so that it can affect the magnetic material of
- the difference between the measured data is determined from the respective oscillation frequencies, the difference between the measured data is recognized as a zero point, and the deviation of the zero point is corrected.
- the magnetic material concentration measuring device having the above-described configuration is useful.
- one of the first coil and the second coil is influenced by a magnetic material, and a difference between measurement data is obtained from an oscillation frequency affected by the magnetic material and an oscillation frequency affected by no magnetic material. Then, the magnetic substance concentration is calculated from the difference between the measured data and the recognized zero point.
- the first coil and the second coil in each LC oscillation circuit are provided.
- the difference between the measured data due to each oscillation frequency, which does not affect the influence of the magnetic substance in the liquid or the influence of the magnetic substance in the liquid at the same time, is recognized as the zero point.
- the difference between the measurement data is obtained by applying the effect of the magnetic substance in the liquid to one of the first coil and the second coil of the circuit, and the deviation of the zero point is calculated from the difference between the measurement data and the recognized zero point. Is corrected to determine the concentration of the magnetic substance. Thereby, the deviation of the zero point can be eliminated, and the concentration measurement of the magnetic material can be easily performed.
- the present invention may be configured such that, when obtaining the difference between the measurement data, the beat period generated by superimposing the oscillation waves is detected to obtain the difference between the measurement data.
- the processing means for obtaining the difference between the measurement data is configured to detect the beat period generated by superimposing the oscillation waves and obtain the difference between the measurement data
- the processing means for obtaining the difference between the minute measurement data is obtained.
- the concentration of the magnetic material can be strictly measured.
- the present invention may be configured so that, when obtaining the difference between the measurement data, the frequency is converted into a voltage signal by an FZV converter, and the difference between the measurement data is obtained from the difference between the voltage values.
- the present invention may be configured so that, when obtaining the difference between the measurement data, the frequency is converted into a numerical value by a pulse counter and the difference between the measurement data is obtained by calculation.
- the frequency is converted into a voltage signal by the FZV converter, and the difference between the measurement data is calculated based on the difference between the voltage values, or the difference between the measurement data is calculated.
- the frequency is converted into a numerical value by a pulse counter and the difference between the measured data is obtained by calculation, it can be configured by combining generally commercially available devices, so that the cost can be further reduced.
- the present invention may be configured so that the flow path of the fluid can be opened and closed or switchable so that the first coil and the Z or the second coil can be influenced by the magnetic material.
- the fluid flow path is configured to be openable / closable or switchable so that the first coil and the Z or the second coil can be influenced by the magnetic material
- the first LC oscillation circuit and the second Since the measurement can be performed with the LC oscillation circuit fixed, the occurrence of noise in the LC oscillation circuit can be prevented.
- the first coil and / or the second coil may be configured to be accessible to a fluid so that the first coil and the Z or the second coil can be affected by a magnetic material.
- the present invention may be configured so that the circuit operation of the first coil, the Z, or the second coil can be switched so that the magnetic material can affect the first coil and the Z or the second coil.
- the first coil and the Z or the second coil are configured to be close to the fluid so that the magnetic material can affect the first coil and the Z or the second coil. If the circuit operation of the first coil and the Z or second coil can be switched so that the magnetic material can affect the Z or second coil, the measurement can be performed with the flow path fixed, so a large-scale device is required. And the cost can be further reduced.
- the oscillation frequency of the LC oscillation circuit for measurement and the oscillation frequency of the LC oscillation circuit for correction are different from each other, and the oscillation frequency of the LC oscillation circuit for measurement and the oscillation frequency of the LC oscillation circuit for correction are A method for improving the detection sensitivity of magnetic materials by calculating the difference between the measurement data and removing disturbances, and comparing the difference between the measurement data and the amount of change due to the influence of the magnetic material based on the difference between the measurement data to improve the detection sensitivity of the magnetic material , To help.
- the measurement is performed based on the difference between the measurement data. Since the difference between the data and the amount of change due to the influence of the magnetic material are compared, the apparent numerical ratio of the amount of change due to the effect of the magnetic material is increased, the detection sensitivity of the magnetic material is improved, and as a result, the concentration of the magnetic material is increased. Can be suitably detected even if the amount is small. Furthermore, the difference between the measured data is calculated by the processing means from the oscillation frequency of the actual measurement LC oscillation circuit and the oscillation frequency of the correction LC oscillation circuit and converted into the concentration of the magnetic substance. Can be measured continuously.
- the present invention includes an LC oscillation circuit having a first coil and an LC oscillation circuit having a second coil.
- the difference between the measured data from the oscillation frequency with the influence of the magnetic body due to the above and the oscillation frequency without the influence of the magnetic body due to the LC oscillation circuit of the second coil is obtained as the first data, and then the second coil only
- the difference between the measured data is determined from the oscillation frequency that is affected by the magnetic material and is not affected by the LC oscillation circuit of the first coil, and the oscillation frequency that is affected by the LC oscillation circuit of the second coil, and is used as the second data.
- the oscillation frequency of the LC oscillation circuit of the first coil affected by the magnetic body and the second coil
- the amount of change due to the influence of the magnetic material including the deviation of the zero point is obtained as the first data.
- the difference between the measured data is calculated from the oscillation frequency of the first coil, which is not affected by the LC oscillation circuit, and the oscillation frequency of the second coil, which is affected by the LC oscillation circuit.
- the amount of change due to the influence of the magnetic material including the deviation of the zero point is obtained as the second data, and further, the difference between the first data and the second data is obtained.
- the concentration of the magnetic material is determined. Can be measured.
- the present invention includes an LC oscillation circuit including a first coil and an LC oscillation circuit including a second coil.
- the difference between the measured data is determined from the oscillation frequency, the difference between the measured data is recognized as a zero point, and then one of the first coil and the second coil is affected by the magnetic material, and the oscillation frequency is affected by the magnetic material.
- the present invention includes an LC oscillation circuit having a first coil and an LC oscillation circuit having a second coil, wherein both the first coil and the second coil are not affected by a magnetic substance in a liquid.
- the difference between the measured data is determined from each oscillation frequency, and the difference between the measured data is recognized as a zero point.
- one of the first coil and the second coil is influenced by the magnetic material, and the magnetic material is affected.
- a zero point correction method that determines the difference between the measured data from the oscillation frequency of the sample and the oscillation frequency without the effect of the magnetic material, and determines the concentration of the magnetic material from the difference between the measured data and the zero point recognized Acts on the law.
- the influence of the magnetic substance in the liquid on both the first coil and the second coil in each of the LC oscillation circuits or the influence of the magnetic substance in the liquid is simultaneously applied.
- the difference between the measurement data and the difference between the measured data and the recognized zero point is obtained by applying the effect of the magnetic substance in the liquid to one of the first coil and the second coil of each LC oscillation circuit.
- the deviation of the zero point is corrected to determine the density of the magnetic substance. Thereby, the deviation of the zero point can be eliminated, and the concentration measurement of the magnetic material can be easily performed.
- measurement data is processed from the oscillation frequency for actual measurement and the oscillation frequency for correction by each LC oscillation circuit and is converted into the concentration of the magnetic substance.
- Medium magnetic force Forces can be measured continuously by removing disturbance and continuously measuring the concentration of magnetic material.
- each LC oscillation circuit oscillates at a different oscillation frequency, the apparent numerical ratio of the change due to the influence of the magnetic material is increased, the detection sensitivity of the magnetic material is improved, and even if the concentration of the magnetic material is very small. Even if there is, it can be suitably detected.
- the amount of change due to the influence of the magnetic material is calculated so as to eliminate the deviation of the zero point, and the amount of change due to the influence of the magnetic material is obtained.
- the zero point is recognized by recognizing a zero point that does not affect the magnetic substance in the liquid on both the first coil and the second coil of each LC oscillation circuit, or simultaneously affects the magnetic substance in the liquid. Since the deviation is eliminated, the concentration of the magnetic substance can be easily measured. Furthermore, if the cost can be reduced by simple processing !, various excellent effects can be obtained.
- FIG. 1 is a conceptual diagram of a first embodiment of the present invention.
- FIG. 2 is a schematic diagram of a first embodiment of the present invention.
- FIG. 3 is a schematic diagram showing a first modification of the first embodiment of the present invention.
- FIG. 4 is a schematic diagram showing a second modification of the first embodiment of the present invention.
- FIG. 5 is a conceptual diagram of a second embodiment of the present invention.
- FIG. 6 is a schematic diagram showing a state in which different frequencies are overlapped and processed in the second embodiment of the present invention.
- FIG. 7 is a schematic diagram of a second embodiment of the present invention.
- FIG. 8 is a schematic diagram showing a first modification of the second embodiment of the present invention.
- FIG. 9 is a schematic view showing a second modification of the second embodiment of the present invention.
- FIG. 10 is a schematic view showing a third modification of the second embodiment of the present invention.
- FIG. 11 is a schematic diagram showing a fourth modification of the second embodiment of the present invention.
- FIG. 12 is a flow chart showing zero point compensation processing in a third embodiment of the present invention.
- FIG. 13 is a schematic diagram showing a configuration of a flow path and an LC oscillation circuit according to a third embodiment of the present invention.
- FIG. 14 is a graph showing a relationship between a change in a zero point with time and a measured value in a third example of the present invention.
- FIG. 15 is a view similar to FIG. 13, but showing a first modification of the third embodiment of the present invention.
- FIG. 16 is a view similar to FIG. 13, but showing a second modification of the third embodiment of the present invention.
- FIG. 17 is a view similar to FIG. 13, but showing a third modification of the third embodiment of the present invention.
- FIG. 18 is a view similar to FIG. 13, but showing a fourth modification of the third embodiment of the present invention.
- FIG. 19 is a flowchart showing zero point compensation processing in a fourth embodiment of the present invention.
- FIG. 20 is a schematic diagram showing a configuration of a flow path and an LC oscillation circuit according to a fourth embodiment of the present invention.
- FIG. 21 is a graph showing the relationship between the deviation of the zero point and the concentration of the magnetic material in the fourth embodiment of the present invention.
- FIG. 22 is a view similar to FIG. 20, but showing a first modification of the fourth embodiment of the present invention.
- FIG. 23 is a view similar to FIG. 20, but showing a second modification of the fourth embodiment of the present invention.
- FIG. 24 is a flowchart showing zero point compensation processing in a fifth embodiment of the present invention.
- FIG. 25 is a schematic diagram showing a configuration of a flow path and an LC oscillation circuit according to a fifth embodiment of the present invention.
- FIG. 26 is a view similar to FIG. 25, but showing a first modification of the fifth embodiment of the present invention.
- FIG. 27 is a view similar to FIG. 25, but showing a second modification of the fifth embodiment of the present invention.
- Processing means a Processing means
- FIG. 1 is a conceptual diagram of a first embodiment of the present invention
- FIG. 2 is a schematic diagram showing a first embodiment of the present invention
- FIG. 3 is a schematic diagram showing a first modification of the first embodiment of the present invention
- FIG. 4 is a schematic diagram showing a second modification of the first embodiment of the present invention.
- An LC oscillation circuit 1 for actual measurement, an LC oscillation circuit 2 for correction, and data processing means 3 are provided.
- the first coil 5 is arranged near or in the pipe through which the fluid flows, and a predetermined oscillation frequency (oscillation wave) is oscillated by the circuit configuration including the first coil 5.
- the LC oscillation circuit 2 for compensation is located at a position that is not affected by the magnetic substance in the fluid or the influence of the magnetic substance in the fluid by passing a predetermined distance from the pipe 4 through which the fluid flows.
- the second coil 6 is arranged at a position where there is little, and the circuit configuration including the second coil 6 is configured to oscillate a predetermined oscillation frequency (oscillation wave).
- the LC oscillation circuit 1 for measurement and the LC oscillation circuit 2 for correction may be configured to have different frequencies within a range of several tens of%, or may be configured to have the same frequency. Is also good.
- the circuit configuration of the LC oscillation circuit 1 for measurement and the circuit configuration of the LC oscillation circuit 2 for correction may be any configuration such as a collector type, a Hartley type, a Colpitts type, etc. Is preferred.
- the LC oscillation circuit 1 for actual measurement and the LC oscillation circuit 2 for correction are identical to each other.
- the oscillation frequency f is changed by changing the inductance L of each coil. Note that, in each of the LC oscillation circuits 1 and 2, there is no correlation between the frequency f and the impedance Z.
- the data processing means 3 is connected to the LC oscillation circuit 1 for measurement and the LC oscillation circuit 2 for correction so that the difference between the two oscillation frequencies (the period of the beat due to the resonance phenomenon of both oscillation waves). )
- a magnetic substance concentration indicator 10 connected to the latter-stage processor 9 and displaying a screen.
- the first stage processor 7, the FZV converter 8, the second stage processor 9, and the magnetic substance concentration display 10 may be configured as a single device or may be configured separately. It may be composed of a predetermined combination.
- Oscillation frequency (oscillation wave) including the signal due to the above, and at the same time, disturbance such as magnetic noise, electromagnetic wave noise, temperature change, electric noise, etc. were included by the LC oscillation circuit 2 for correction.
- Oscillation frequency (oscillation wave) is oscillated and sent to the processor 7 at the preceding stage of the processing means 3.
- the rate of change (detection sensitivity) due to the detection of a magnetic substance in the actual measurement LC oscillation circuit 1 will be described using numerical values assuming the frequency. If the oscillation frequency of the actual measurement LC oscillation circuit 1 is 50 KHz, If the oscillation frequency of the LC oscillation circuit 2 for measurement is 45 KHz, and the amount of change due to the magnetic material of 10 Hz occurs in the LC oscillation circuit 1 for measurement, The rate of change (detection sensitivity) due to body detection is about 0.02% from 10HzZ (50KHz + 10Hz).
- the oscillation wave of the LC oscillation circuit 1 for measurement and the oscillation wave of the LC oscillation circuit 2 for correction are superimposed, and two The disturbance is removed by finding the beat period (waveform) that is the difference in frequency (difference in measurement data).
- the processor 7 compares the amount of change due to the influence of the magnetic material with reference to the beat period (waveform).
- the rate of change (detection sensitivity) based on the detection of the magnetic substance based on the beat period which is the difference between the two frequencies (the difference between the measurement data) is explained using numerical values based on the assumed frequency.
- the difference between the two frequencies is from (50KHz + 10Hz) -45KHz to 5KHz + 10Hz, and the rate of change (detection sensitivity) due to the detection of the magnetic material is about 0% from 10HzZ (5KHz + 10Hz). 2%.
- the beat cycle (waveform) is sent to the FZV converter 8, which converts the beat cycle (waveform) into a voltage signal (difference in voltage value) and sends the signal to the subsequent processor 9.
- the processor 9 in the subsequent stage compares the comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value with the voltage signal (difference in voltage value), converts the data into the concentration of the magnetic substance, and displays the concentration of the magnetic substance.
- the concentration of the magnetic substance in the fluid is indicated by a vessel 10. At this time, the concentration of the magnetic substance is continuously measured and displayed.
- the oscillation frequency force measured by the LC oscillation circuit 1 for measurement and the oscillation frequency force measured by the LC oscillation circuit 2 for correction are processed and converted into the concentration of the magnetic substance. Therefore, it is possible to always remove disturbances and correct by using a signal from the magnetic substance in the fluid, and to continuously measure the concentration of the magnetic substance. Also, the oscillation frequency oscillated by the LC oscillation circuit 1 for actual measurement and the LC oscillation circuit 2 for correction varies with a very small amount of magnetic material, so that the concentration of the magnetic material can be measured appropriately with a resolution of the order of several ppm. it can.
- the second coil 6 of the primary LC oscillation circuit 2 is located at a position that is not affected by the magnetic substance in the fluid or at a position that is less affected by the magnetic substance in the fluid. Therefore, disturbances such as magnetic noise can be appropriately eliminated, and the concentration measurement of the magnetic material can be performed with a simple configuration.
- the first coil 5 of the actual measurement LC oscillation circuit 1 is arranged near the pipe 4, the actual measurement LC oscillation circuit 1 is not affected by the arrangement of the pipe 4 through which the fluid passes. Can be easily arranged.
- the LC oscillation circuit 1 for actual measurement and the LC oscillation circuit 2 for correction can be configured at low cost by eliminating the need for a cooling medium and reducing labor, and by eliminating the need for expensive components such as superconducting quantum elements. can do.
- the difference between the measurement data and the magnetic material based on the difference between the measurement data are used. Since the amount of change due to the influence of the magnetic material is compared, the apparent numerical ratio of the amount of change due to the effect of the magnetic material is increased (10 times in the case of the above assumed value), and the detection sensitivity of the magnetic material is improved. Even if the concentration of the body is very small, it can be suitably detected.
- the frequency difference between the LC oscillation circuit 1 for measurement and the LC oscillation circuit 2 for correction is several percent or more, there is a possibility that disturbance may not be appropriately removed, and the detection sensitivity of the magnetic substance may be reduced. It cannot be improved appropriately.
- the difference between the measurement data is obtained by the processing means from the oscillation frequency of the LC oscillation circuit 1 for actual measurement and the oscillation frequency of the LC oscillation circuit 2 for correction, and is converted into the concentration of the magnetic substance.
- the concentration of the magnetic substance can be continuously measured.
- the processing can be performed with a minimum number of parts, the cost can be reduced.
- the processing means 3 for obtaining the difference between the measurement data is configured to detect the period of the beat generated by superimposing the oscillating waves and obtain the difference between the measurement data, a minute difference in the frequency can be detected.
- a minute change in measurement data such as one thousandth of the oscillation frequency can be suitably detected, and the concentration of the magnetic substance can be accurately measured.
- a first modified example of the first embodiment includes an actual measurement LC oscillation circuit 1 and a correction LC oscillation circuit 2 substantially similar to those of the first embodiment as shown in FIG.
- the data processing means 3 is changed to a new processing means 3a.
- the portions denoted by the same reference numerals as those in FIG. 2 represent the same components.
- the data processing means 3a is connected to the actual measurement LC oscillation circuit 1 and is connected to the first FZV converter (frequency / voltage converter 11 and correction LC oscillation circuit 2) which converts the frequency into a voltage signal.
- the second FZV converter (frequency-voltage converter) 12 that converts the frequency to a voltage signal with the first FZV converter 11 and the second FZV converter 12 Processor 13 for obtaining the difference), a subsequent processor 14 connected to the preceding processor 13 and provided with comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value in advance, and the subsequent processing.
- a magnetic substance concentration display 10 which can be displayed on a screen by being connected to the processing unit 14.
- a first FZV converter 11, a second FZV converter 12, and a preceding processing unit 13 which constitute the processing means 3a are provided.
- the post-processing unit 14 and the magnetic substance concentration indicator 10 May be composed of different devices, may be composed separately, or may be composed of a predetermined combination.
- Oscillation frequency including the signal due to the oscillating frequency is sent to the first FZV converter 11 and the LC oscillation circuit 2 for correction includes disturbances such as magnetic noise, electromagnetic noise, temperature change, and electrical noise.
- the oscillation frequency is oscillated and sent to the second FZV converter 12.
- each oscillation frequency is converted into a voltage signal and sent to the preceding processor 13, and the difference between the voltage values ( The difference between the measured data is obtained and sent to the subsequent processor 14, where the comparison data showing the correlation between the concentration of the magnetic substance and the voltage value, the difference between the voltage values (the difference between the measured data) and Are compared and converted into the concentration of the magnetic substance, and the concentration of the magnetic substance in the fluid is indicated by the magnetic substance concentration indicator 10.
- the concentration of the magnetic substance is continuously measured and displayed.
- the second modification of the first embodiment includes an actual measurement LC oscillation circuit 1 and a correction LC oscillation circuit 2 substantially similar to those of the first embodiment as shown in FIG.
- the data processing means 3 is changed to a new processing means 3b.
- the portions denoted by the same reference numerals as in FIG. 2 represent the same components.
- the data processing means 3b is connected to the LC oscillation circuit 1 for actual measurement and converts the frequency into a numerical value, and is connected to the LC oscillation circuit 2 for correction and counts the frequency.
- a second pulse counter 16 for converting the value into a value
- a first-stage processor 17 connected to the first pulse counter 15 and the second pulse counter 16 for calculating a difference between the two values (difference in measurement data)
- a second processor 18 connected to the first processor 17 and having previously inputted comparison data indicating the correlation between the concentration of the magnetic substance and the numerical value, and a second magnetic substance connected to the second processor 18 and capable of displaying a screen.
- a density indicator 10 10.
- the first pulse counter 15, the second pulse counter 16, the former stage processor 17, the latter stage processor 18, and the magnetic substance concentration indicator 10 constituting the processing means 3b are collectively constituted by one device. , May be composed of pieces, or may be composed of a predetermined combination.
- Oscillation frequency including the signal due to the above is oscillated and sent to the first Norse counter 15, and the disturbance including magnetic noise, electromagnetic wave noise, temperature change, electric noise, etc. is included by the LC oscillation circuit 2 for correction.
- the oscillation frequency is oscillated and sent to the second pulse counter 16.
- the first pulse counter 15 and the second pulse counter 16 convert the respective oscillating frequencies into numerical values and send them to the preceding processor 17, and the former processor 17 calculates the difference between the numerical values (the measurement data The difference is calculated and sent to the subsequent processor 18.
- the latter processor 18 compares the comparison data indicating the correlation between the concentration of the magnetic substance and the numerical value with the numerical value difference (measurement data difference).
- the concentration of the magnetic substance is converted into the concentration of the magnetic substance, and the magnetic substance concentration indicator 10 indicates the concentration of the magnetic substance in the fluid. At this time, the concentration of the magnetic substance is continuously measured and displayed.
- the second modification of the first embodiment it is possible to obtain substantially the same operation and effect as those of the first embodiment and the first modification of the first embodiment.
- the difference between the measurement data is obtained, if the frequency is converted into a numerical value by the pulse counters 15 and 16 and the difference between the measurement data is obtained by calculation, it can be configured by combining generally commercially available devices. Therefore, the cost can be further reduced.
- FIG. 5 is a conceptual diagram of a second embodiment of the present invention
- FIG. 6 is a schematic diagram showing a state in which different frequencies are overlapped and processed in the second embodiment of the present invention
- FIG. 7 is a second embodiment of the present invention.
- FIG. 8 is a schematic diagram showing a first modification of the second embodiment of the present invention
- FIG. 9 is a schematic diagram showing a second modification of the second embodiment of the present invention.
- 10 is a schematic diagram illustrating a third modification of the second embodiment of the present invention
- FIG. 11 is a schematic diagram illustrating a fourth modification of the second embodiment of the present invention.
- the magnetic substance concentration measuring apparatus and the method of improving the detection sensitivity of the second embodiment include an LC oscillation circuit 21 for measurement, an LC oscillation circuit 22 for correction, and an LC oscillation circuit 23 for comparison as shown in FIG. And data processing means 24.
- the LC oscillation circuit 21 for actual measurement has the first coil 26 arranged near or in the pipe 25 through which the fluid flows (shown in the vicinity of the pipe 25 in FIGS. 7 to 11).
- the circuit configuration including the coil 26 is configured to oscillate a predetermined oscillation frequency (oscillation wave).
- the LC oscillation circuit 22 for correction is located at a position not affected by the magnetic substance in the fluid or at a position less affected by the magnetic substance in the fluid by passing a predetermined distance from the pipe 25 through which the fluid flows.
- the second coil 27 is arranged, and a predetermined oscillation frequency (oscillation wave) is oscillated by a circuit configuration including the second coil 27.
- the LC oscillation circuit 23 for comparison is, similarly to the LC oscillation circuit 22 for correction, provided at a predetermined distance from the pipe 25 through which the fluid flows so as not to be affected by the magnetic substance in the fluid.
- the third coil 28 is arranged at a position where the influence of the magnetic substance in the fluid is small!
- the circuit configuration including the third coil 28 oscillates a predetermined oscillation frequency (oscillation wave).
- the LC oscillation circuit 21 for measurement, the LC oscillation circuit 22 for correction, and the LC oscillation circuit 23 for comparison are configured so that their frequencies are different from each other within a range of several tens of%. Or may be configured to be the same. Further, each circuit configuration may be any configuration such as a collector type, a Hartley type, a Colpitts type, etc. It is preferable that the oscillation circuits 22 are of the same type, and it is particularly preferable that all three oscillation circuits have the same type.
- the oscillation frequency f is changed by changing the inductance L of each coil.
- the frequency f and the impedance Z are not correlated.
- the data processing means 24 is connected to the LC oscillation circuit 21 for the actual measurement and the LC oscillation circuit 23 for the comparison, and detects the difference between the two oscillation frequencies (the beat due to the resonance phenomenon of both oscillation waves). Is connected to the first processor 29, the LC oscillator circuit 22 for correction, and the LC oscillator circuit 23 for comparison to determine the difference between the oscillation frequencies of both (the beat due to the resonance phenomenon of both oscillation waves).
- a second processor 30 and a middle processor 31 connected to the first processor 29 in the preceding stage and the second processor 30 in the preceding stage to determine a difference between the waveforms of the two (a beat due to a resonance phenomenon of both waveforms);
- the FZV converter (frequency-voltage conversion) 32 which is connected to the middle-stage processor 31 and converts the frequency into a voltage signal, is connected to the FZV converter 32 and shows the correlation between the concentration of the magnetic material and the voltage value in advance.
- the processor 33 connected to the latter stage where the comparison data is input is connected to the latter processor 33. Is that have a magnetic concentration indicator 34 capable of screen display.
- the first processor 29 in the former stage, the second processor 30 in the former stage, the processor 31 in the middle stage, the FZV converter 32, the processor 33 in the latter stage, and the magnetic substance concentration display 34 constituting the processing means 24 are summarized as follows. May be configured by one device, may be configured separately, or may be configured by a predetermined combination! Hereinafter, the operation of the second embodiment will be described.
- the measurement of the magnetic substance is performed by the actual measurement LC oscillation circuit 21 together with disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise.
- Oscillation frequency (oscillation wave) including the signal due to the influence is oscillated and sent to the first processor 29 in the preceding stage of the processing means 24, and the LC oscillation circuit 22 for correction causes magnetic noise, electromagnetic noise, and temperature change.
- the oscillation frequency (oscillation wave) including disturbance such as electric noise is oscillated and sent to the second processor 30 in the preceding stage of the processing means 24, and at the same time, the noise is generated by the LC oscillation circuit 23 for comparison.
- Oscillation frequency including disturbance such as is oscillated and sent to the first processor 29 and the second processor 30 in the preceding stage of the processing means 24.
- the rate of change (detection sensitivity) due to the detection of a magnetic substance in the actual measurement LC oscillation circuit 21 will be described using numerical values assuming the frequency. If the oscillation frequency of the actual measurement LC oscillation circuit 21 is ⁇ , The oscillation frequency of the LC oscillation circuit 22 for correction is 99 KHz, the oscillation frequency of the LC oscillation circuit 23 for comparison is 90 KHz, and the LC oscillation circuit 21 for actual measurement is made of a 10 Hz magnetic material. When the amount of change occurs, the change rate (detection sensitivity) due to the detection of the magnetic substance in the actual measurement LC oscillation circuit 21 is about 0.01% from 10 HzZ (100 KHz + 10 Hz).
- the oscillation wave of the LC oscillation circuit 21 for measurement and the oscillation wave of the LC oscillation circuit 23 for comparison are superimposed, and the resonance phenomenon beats,
- the beat period (waveform) which is the difference between the two frequencies (the difference between the measurement data) is obtained and sent to the middle-stage processor 31 as the first data.
- the oscillation wave of the LC oscillation circuit 22 for correction and the oscillation wave of the LC oscillation circuit 23 for comparison are superimposed, and the two A beat cycle (waveform), which is a difference between the measured data (difference in measured data), is obtained and sent to the middle-stage processor 31 as second data.
- the rate of change (detection sensitivity) due to the detection of the magnetic substance in the first processor 29 will be described using numerical values based on the assumption of the frequency.
- the difference in the frequency (the difference in the measurement data) in the second processor 30 is from 9 kHz to 90 kHz to 9 kHz.
- the waveform of the first data and the waveform of the second data are overlapped and shared.
- the beat period which is the difference (data difference) between the two frequencies
- the middle stage processor 31 calculates the difference (data difference) between the two frequencies.
- the amount of change due to the influence of the magnetic material is compared based on a certain beat period.
- the change rate (detection sensitivity) due to the detection of the magnetic substance based on the beat period, which is the difference (data difference) between the two frequencies, in the processor 31 in the middle stage will be described by numerical values on the assumption of the frequency.
- FIG. 6 shows a waveform in which different frequencies are superimposed and processed.
- the oscillation wave of the LC oscillation circuit 21 for measurement and the frequency of the LC oscillation circuit 23 for comparison are used.
- the waveform shown in F1 in Fig. 6 is obtained.
- the waveform shown in F2 is obtained, and the oscillation wave of the LC oscillation circuit 21 for measurement and the LC oscillation circuit 23 for comparison are obtained.
- Frequency difference (measurement data difference).
- the waveform becomes as shown by F3 in FIG.
- this waveform it becomes a waveform like F4, and becomes the difference between the frequency of the oscillation of the LC oscillation circuit 22 for correction and the frequency of the LC oscillation circuit 23 for comparison (difference in measurement data).
- the middle stage processor 31 when the waveform of the first data (difference in measurement data) and the waveform of the second data (difference in measurement data) are amplified and superimposed, as shown in F5 in FIG.
- the beat cycle becomes a waveform, and the beat cycle is the difference (data difference) between the frequency of the actual measurement LC oscillation circuit and that of the correction LC oscillation circuit.
- the beat cycle (waveform) is sent to the FZV converter 32, which converts the beat cycle (waveform) into a voltage signal (difference in voltage value) and sends it to the subsequent processor 33.
- the processor 33 in the subsequent stage compares the comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value with the voltage signal (difference in voltage value), converts the data into the concentration of the magnetic substance, and displays the concentration of the magnetic substance.
- Container 34 indicates the concentration of the magnetic substance in the fluid. At this time, the concentration of the magnetic substance is continuously measured and displayed.
- the oscillation frequency of the LC oscillation circuit 21 for measurement the oscillation frequency of the LC oscillation circuit 22 for correction, and the oscillation frequency meter of the LC oscillation circuit 23 for comparison Since the measured data is processed and converted into the concentration of the magnetic material, the disturbance is always removed by the signal from the magnetic material in the fluid, correction is performed, and the concentration of the magnetic material can be continuously measured. or
- the concentration of the magnetic It can be suitably measured with a resolution of.
- the second coil 27 of the LC oscillation circuit 22 for correction and the third coil 28 of the LC oscillation circuit 23 for comparison are not affected by the magnetic substance in the fluid. Since it is arranged at a small number of positions, disturbances such as magnetic noise can be appropriately eliminated, and the density measurement of the magnetic material can be performed with a simple configuration.
- the actual measurement LC oscillation circuit 21 since the first coil 26 of the actual measurement LC oscillation circuit 21 is disposed near the pipe 25, the actual measurement LC oscillation circuit is not affected by the arrangement of the pipe 25 through which the fluid passes. 21 configurations can be easily arranged. Furthermore, the LC oscillation circuit 21 for actual measurement, the LC oscillation circuit 22 for correction, and the LC oscillation circuit 23 for comparison make it unnecessary to use a cooling medium, reduce labor, and use expensive components such as superconducting quantum elements. And can be configured at low cost.
- the oscillation frequency for comparison further removes disturbances such as noise due to temperature change of the magnetic force in the fluid. Correction can be made correctly.
- a minute difference in the frequency can be detected. It is possible to suitably detect even a minute change in the measurement data, such as one-hundredths of, and accurately measure the concentration of the magnetic substance.
- a first modification of the second embodiment is similar to the second embodiment, as shown in FIG. 8, in which an actual measurement LC oscillation circuit 21, a correction LC oscillation circuit 22, and a comparison LC oscillation circuit 22 are provided.
- the data processing means 24a is connected to a first FZV converter (frequency / voltage converter) 35 connected to the first processor 29 in the preceding stage and converting the frequency into a voltage signal, and a second processor 30 in the preceding stage.
- the second FZV converter (frequency-to-voltage conversion) 36 that is connected and converts the frequency to a voltage signal, and the difference between the voltage values of the two FZV converters that are connected to the first FZV converter 35 and the second FZV converter 36
- the first processing unit 29 in the previous stage, the second processing unit 30 in the previous stage, the first FZV converter 35, the second FZV converter 36, the middle processing unit 37, and the processing unit in the second stage constitute the processing means 24a.
- the magnetic substance concentration indicator 34 may be constituted by one device collectively, may be constituted separately, or may be constituted by a predetermined combination.
- the magnetic noise, the electromagnetic wave noise, the temperature change, and the electric noise are measured by the actual measurement LC oscillation circuit 21 in substantially the same manner as in the second embodiment.
- Oscillation frequency (oscillation wave) including a signal due to the influence of the magnetic material is oscillated and sent to the first processor 29 before the processing means 24a, and the magnetic noise is corrected by the LC oscillation circuit 22 for correction.
- Oscillation frequency including disturbances such as electromagnetic noise, temperature change, electric noise, etc.
- the circuit 23 oscillates an oscillation frequency (oscillation wave) including disturbance such as noise and sends it to the first processor 29 and the second processor 30 in the preceding stage of the processing means 24a.
- the oscillation wave of the LC oscillation circuit 21 for measurement and the oscillation wave of the LC oscillation circuit 23 for comparison are superimposed, and the two difference A beat cycle (waveform) as (difference in measurement data) is obtained and sent to the first FZV converter 35 as first data.
- the oscillation wave of the LC oscillation circuit 22 for correction and the oscillation wave of the LC oscillation circuit 23 for comparison are superimposed, and the two The beat frequency (waveform), which is the difference between the measured data (difference in measured data), is obtained and sent to the second FZV converter 36 as second data.
- the first FZV converter 35 and the second FZV converter 36 convert the respective waveforms into voltage signals and send them to the middle processing unit 37. Data difference) and sends it to the subsequent processor 38, where the comparison data showing the correlation between the concentration of the magnetic substance and the voltage value and the difference between the voltage values (the difference between the measured data) Then, the concentration of the magnetic substance is converted into the concentration of the magnetic substance, and the magnetic substance concentration indicator 34 indicates the concentration of the magnetic substance in the fluid. At this time, the concentration of the magnetic substance is continuously measured and displayed.
- a second modification of the second embodiment is similar to that of the second embodiment, as shown in FIG. 9, and includes an actual measurement LC oscillation circuit 21, a correction LC oscillation circuit 22, and a comparison LC oscillation circuit 22.
- the data processing means 24 is changed to new processing means 24b.
- the portions denoted by the same reference numerals as in FIG. 7 represent the same components.
- the data processing means 24b is connected to the actual measurement LC oscillation circuit 21 and converts the frequency into a voltage signal by the first FZV converter (frequency / voltage conversion 39 and correction LC oscillation circuit 22).
- a second FZV converter (frequency-voltage converter) 40 that is connected to convert the frequency to a voltage signal
- a third FZV converter (frequency-to-voltage converter) that is connected to the LC oscillation circuit 23 for comparison and converts the frequency to a voltage signal ( (Frequency-voltage conversion) 41 and the fourth FZV converter (frequency-voltage converter) 42 and the first FZV converter 39 and the third FZV converter 41 Is connected to the first processor 43 in the preceding stage to obtain the data difference)
- the second F / V converter 40 and the fourth F / V converter 42 calculates the difference between the two voltage values (measurement data difference).
- the apparatus includes a processor 46 at the subsequent stage to which comparison data indicating a correlation between the concentration and the voltage value is input, and a magnetic substance concentration indicator 34 connected to the processor 46 at the subsequent stage and capable of displaying a screen.
- the processing unit 43, the second processing unit 44 in the previous stage, the processing unit 45 in the middle stage, the processing unit 46 in the second stage, and the magnetic substance concentration indicator 34 may be configured as a single device or may be configured separately. It may be composed of a certain combination.
- the LC oscillation circuit 21 for actual measurement is used to measure the magnetic substance, electromagnetic noise, temperature change, electric noise, and other disturbances.
- Oscillation frequency (oscillation wave) including the signal due to the influence is oscillated and sent to the first FZV converter 39 of the processing means 24b, and the LC oscillation circuit 22 for correction generates magnetic noise, electromagnetic noise, and temperature.
- Oscillation frequency (oscillation wave) including disturbance such as change and electric noise is oscillated and sent to the second FZV converter 40 of the processing means 24b, and at the same time, noise and the like are generated by the LC oscillation circuit 23 for comparison.
- Oscillation frequency (oscillation wave) including the disturbance is oscillated and sent to the third F / V converter 41 and the fourth F / V converter 42 of the processing means 24b.
- the respective oscillation frequencies are converted into voltage signals and sent to the first processor 43 in the preceding stage
- each oscillation frequency is converted into a voltage signal and sent to the second processor 44 in the preceding stage.
- the first processor 43 in the former stage calculates the difference in voltage value (difference in measurement data) and sends it to the processor 45 in the middle stage
- the second processor 44 in the previous stage calculates the difference in voltage value (difference in measured data). ) Is similarly sent to the middle processor 45.
- the middle processor 45 further calculates the difference in voltage value (difference in measurement data) and sends it to the subsequent processor 46.
- the latter processor 46 shows the correlation between the concentration of the magnetic material and the voltage value.
- the comparison data is compared with the voltage value difference (measurement data difference) and converted into a magnetic substance concentration, and the magnetic substance concentration indicator 34 indicates the concentration of the magnetic substance in the fluid. At this time, the measurement and display of the concentration of the magnetic material are continuously performed.
- the difference between the measurement data is obtained, if the frequency is converted into a voltage signal by the FZV converters 39, 40, 41, and 42, and the difference between the measurement data is obtained based on the difference in the voltage value, it is generally sold. Since the apparatus can be configured by combining the apparatuses, the cost can be further reduced.
- an LC oscillation circuit 21 for measurement an LC oscillation circuit 22 for correction, and a comparison
- the data processing means 24 is changed to a new processing means 24c.
- portions denoted by the same reference numerals as those in FIG. 7 represent the same components.
- the data processing means 24c is connected to the LC oscillation circuit 21 for actual measurement and converts the frequency into a numerical value.
- the first pulse counter 47 is connected to the LC oscillation circuit 22 for correction and converts the frequency into a numerical value.
- the first processor 51 is connected to the third pulse counter 49 and calculates the difference between the two values (difference in measurement data), and is connected to the second pulse counter 48 and the fourth pulse counter 50.
- the processor 52, the middle processor 53, the latter processor 54, and the magnetic substance concentration indicator 34 may be configured as one device at a time, may be configured separately, or may have a predetermined configuration. It may be composed of combinations.
- the LC oscillation circuit 21 When measuring the concentration of a magnetic substance contained in a fluid, the LC oscillation circuit 21 for actual measurement is used to measure the magnetic substance, electromagnetic noise, temperature change, electrical noise, and other disturbances.
- Oscillation frequency (oscillation wave) including the signal due to the influence is oscillated to generate the first pulse of the processing means 24c.
- the oscillation frequency (oscillation wave) including disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise is oscillated by the correction LC oscillation circuit 22 and the processing means 24c.
- the first pulse counter 47 and the third pulse counter 49 convert each oscillation frequency into a numerical value and send it to the first processor 51 in the preceding stage
- the second pulse counter 48 and the fourth pulse counter In the pulse counter 50 each oscillation frequency is converted into a numerical value and sent to the second processor 52 in the preceding stage.
- the first processor 51 in the former stage calculates the difference in numerical values (difference in measured data) and sends it to the processor 53 in the middle stage
- the second processor 52 in the former stage calculates the difference in numerical values (difference in measured data). It is sent to the processor 53 in the middle stage.
- the processor 53 in the middle stage further calculates the difference in numerical values (difference in measurement data) and sends it to the processor 54 in the subsequent stage.
- the processor 54 in the latter stage provides comparison data indicating the correlation between the concentration of the magnetic substance and the numerical value. And the difference between the numerical values (the difference between the measured data) is converted to the concentration of the magnetic substance, and the concentration of the magnetic substance in the fluid is indicated by the magnetic substance concentration indicator 34. At this time, the concentration of the magnetic substance is continuously measured and displayed.
- a fourth modification of the second embodiment is similar to the second embodiment, as shown in FIG. 11, in which an actual measurement LC oscillation circuit 21, a correction LC oscillation circuit 22, and a comparison LC oscillation circuit 22 are provided.
- This is provided with an LC oscillation circuit 23, a first processing unit 29 in a preceding stage, and a second processing unit 30 in a preceding stage, and the other part of the processing unit 24 is changed to a new processing unit 24d.
- portions denoted by the same reference numerals as those in FIG. 7 represent the same components.
- the data processing means 24d is connected to the first processor 29 in the preceding stage and converts the frequency into a voltage signal
- the first pulse counter 55 is connected to the second processor 30 in the preceding stage to convert the frequency into a voltage signal.
- a second pulse counter 56 that converts the signal into a signal
- a second-stage processor 57 connected to the second pulse counter 56 for calculating a difference between the two values (difference in measured data), and a correlating relationship between the concentration of the magnetic substance and the numerical value, which is connected to the middle-stage processor 57 in advance.
- a magnetic substance concentration indicator 34 connected to the subsequent processor 58 and capable of displaying a screen.
- the magnetic substance concentration indicator 34 may be constituted by one device as a whole, may be constituted separately, or may be constituted by a predetermined combination.
- the magnetic noise, electromagnetic wave noise, temperature change, and electrical noise are measured by the actual measurement LC oscillation circuit 21 in a manner similar to the second embodiment.
- Oscillation frequency (oscillation wave) including the signal due to the influence of the magnetic material is oscillated together with the disturbance and sent to the first processor 29 in the preceding stage of the processing means 24d, and the magnetic noise is generated by the LC oscillation circuit 22 for correction.
- Oscillation frequency including disturbances such as electromagnetic noise, temperature change, and electrical noise is oscillated and sent to the second processor 30 in the preceding stage of the processing means 24d, and at the same time, LC oscillation for comparison
- the circuit 23 oscillates an oscillating frequency (oscillation wave) including disturbance such as noise and sends it to the first processor 29 and the second processor 30 in the preceding stage of the processing means 24d.
- the oscillation wave of the LC oscillation circuit 21 for measurement and the oscillation wave of the LC oscillation circuit 23 for comparison are superimposed, and the two The beat period (waveform), which is the difference (difference in measured data), is obtained and sent to the first pulse counter 55 as first data.
- the oscillation wave of the LC oscillation circuit 22 for correction and the oscillation wave of the LC oscillation circuit 23 for comparison are superimposed, and the two The beat cycle (waveform), which is the difference between the measured data (difference in measured data), is obtained and sent to the second pulse counter 56 as second data.
- the first pulse counter 55 and the second pulse counter 56 convert the respective waveforms into numerical values and send them to the middle processor 57, where the difference between the numerical values (measurement data The difference is calculated and sent to the subsequent processor 58.
- the latter processor 58 compares the comparison data indicating the correlation between the concentration of the magnetic substance and the numerical value with the difference between the numerical values (the difference between the measured data).
- Magnetic substance concentration The magnetic substance concentration indicator 34 indicates the concentration of the magnetic substance in the fluid. At this time, the concentration of the magnetic material is continuously measured and displayed by using the oscillation frequency for actual measurement, the oscillation frequency for correction, and the oscillation frequency for comparison.
- FIG. 12 is a flowchart showing the zero point compensation processing in the third embodiment of the present invention
- FIG. 13 is a schematic diagram showing the configuration of the flow path and the LC oscillation circuit in the third embodiment of the present invention
- FIG. 15 is a graph showing the relationship between the change of the zero point and the measured value over time in the third embodiment.
- FIGS. 15 to 18 show first to fourth modifications of the third embodiment of the present invention, respectively.
- the magnetic substance concentration measuring apparatus and the zero point compensation method of the third embodiment include a first LC oscillation circuit 1, a second LC oscillation circuit 2, and a first embodiment as shown in Figs. And data processing means 3 (see Fig. 2) which is almost the same as the above.
- FIG. 12 to FIG. 14 the parts denoted by the same reference numerals as those in FIG. 2 represent the same parts.
- the first LC oscillation circuit 1 fixes the first coil 5 in the vicinity of or in the pipe 60 through which the fluid flows, and generates a predetermined oscillation frequency (oscillation wave) by the circuit configuration including the first coil 5. It is configured to oscillate.
- the second LC oscillation circuit 2 is arranged substantially in parallel with the first LC oscillation circuit 1 along the direction in which the pipe 60 extends, and the second coil 6 is fixed near or in the pipe 60. Further, the circuit configuration including the second coil 6 is configured to oscillate a predetermined oscillation frequency (oscillation wave).
- the pipe 60 through which the fluid flows has a first opening / closing valve 61 which can be opened / closed upstream of the position near the first coil 5, and a position close to the first coil 5 and a position near the second coil 6.
- a second on-off valve 62 that can be opened and closed between them, and a third on-off valve 63 that can be opened and closed downstream from a position near the second coil 6.
- the first LC oscillation circuit 1 and the second LC oscillation circuit 2 may be configured so that the frequencies are different from each other in a range of several tens of%! It may be configured to!
- the circuit configuration of the first LC oscillation circuit 1 and the circuit configuration of the second LC oscillation circuit 2 are Any configuration such as a Kuta type, a Hartley type, a Colpitts type, etc. may be used, but it is preferable that both have the same type.
- the oscillation frequency f is changed by changing the inductance L of each coil. Note that, in each of the LC oscillation circuits 1 and 2, there is no correlation between the frequency f and the impedance Z.
- the data processing means 3 is connected to the first LC oscillation circuit 1 and the second LC oscillation circuit 2 as shown in FIG.
- an FZV converter (frequency / voltage conversion) 8 connected to the preprocessor 7 and converting the frequency to a voltage signal
- a processor 9 connected to the FZV converter 8 and to which comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value is input in advance, and a magnetic substance concentration display which is connected to the processor 9 and can be displayed on the screen.
- the container 10 is provided.
- the data processing means 3 includes a first FZV converter (frequency / voltage converter 11 and a second LC oscillator A second FZV converter (frequency-voltage converter) 12 that is connected to the circuit 2 and converts a frequency into a voltage signal, and is connected to the first FZV converter 11 and the second FZV converter 12 so that the A preceding processor 13 for calculating the difference (difference in measurement data), and a later processor connected to the preceding processor 13 and receiving comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value in advance. And a magnetic substance concentration display 10 that can be displayed on a screen by being connected to a processing unit 14 at the subsequent stage. Furthermore, the data processing means 3 includes a first LC oscillation circuit 1 as shown in FIG.
- a first pulse counter 15 connected to convert a frequency to a numerical value
- a second pulse counter 16 connected to a second LC oscillation circuit 2 to convert a frequency to a numerical value
- a first pulse counter 15 and a second pulse counter 16 connected to the former stage processor 17 for calculating the difference between the two values (difference in measured data), and connected to the former stage processor 17 to determine the concentration of the magnetic substance and the numerical value in advance.
- a processor 18 at the subsequent stage to which comparison data indicating a correlation is input, and a magnetic substance concentration indicator 10 connected to the processor 18 at the subsequent stage and capable of displaying a screen may be provided.
- the configuration of the processing means 3 may be configured as a single device collectively, may be configured separately, or may be configured in a predetermined combination.
- the first on-off valve 61 and the third on-off valve 61 are started from the start of measurement (step S1 in Fig. 12; each step is hereinafter shown in Fig. 12).
- the fluid is filled only in the vicinity of the first coil 5 of the pipe 60, and the influence of the magnetic material of the fluid is reduced by the first LC through the first coil 5.
- the first LC oscillation circuit 1 oscillates an oscillation frequency (oscillation wave) including a signal due to the influence of the magnetic material together with disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise.
- the second LC oscillation circuit 2 oscillates an oscillation frequency (oscillation wave) including disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise, thereby processing each frequency.
- the frequency is sent to the processor 7 in the preceding stage, and the difference between the frequency of the first LC oscillation circuit 1 and the frequency of the second LC oscillation circuit 2 is measured (step S3), and the frequency difference (first data) is measured in the preceding stage. Recording is performed by the processor 7 (step S4).
- the frequency difference (first data) is described as an assumed numerical value
- the oscillation frequency of the first LC oscillation circuit 1 is 50 KHz
- the oscillation frequency of the second LC oscillation circuit 2 is 45 KHz.
- the fluid is supplied to the pipe 60 in the vicinity of the first coil 5, and the positional force in the vicinity of the second coil 6 is also increased.
- the first LC oscillation circuit 1 generates magnetic noise, electromagnetic noise
- the second LC oscillation circuit 22 oscillates an oscillation frequency (oscillation wave) that includes disturbances such as a degree change and electrical noise, and at the same time, generates disturbances such as magnetic noise, electromagnetic noise, temperature change, and electrical noise.
- each frequency is sent to the processor 7 in the preceding stage of the processing means 3 so that the frequency of the first LC oscillation circuit 1 and the second
- the difference from the frequency of the LC oscillation circuit 22 is measured (step S6), and the frequency difference (second data) is recorded by the preceding processor 7 (step S7).
- the difference between the frequencies (second data) will be described using assumed values.
- the oscillation frequency of the first LC oscillation circuit 1 is 50 KHz
- the oscillation frequency of the second LC oscillation circuit 2 is 45 KHz.
- the difference is measured from the frequency difference at the time of the influence (second data) (Step S8), and the correlation between the concentration of the magnetic substance and the voltage value is processed by the subsequent processor 9 via the FZV converter 8 and the like.
- the comparison data indicating the relationship is compared with a voltage signal (difference in voltage value) and converted into a magnetic substance concentration (step S9), and the magnetic substance concentration indicator 10 indicates the concentration of the magnetic substance in the fluid.
- the first on-off valve 61, the second on-off valve 62, The three on-off valves 63 are sequentially opened and closed by the same processing as the flow following the start of measurement (step S1), and continuously determine the concentration of the magnetic substance.
- the relationship between the change of the zero point with time and the measured value is represented in a force graph, as shown in FIG. 14, where the frequency of the fluid when the magnetic material of the fluid affects only the first LC oscillation circuit 1 is shown.
- the difference (first data) is Pl
- the frequency difference (second data) when only the second LC oscillation circuit 2 is affected by the magnetic material of the fluid is P2
- the difference between these two values is ⁇ VI Is contrast Is converted to the concentration of the magnetic material by the data.
- first and second coils 5 and 6 are configured to open and close the fluid flow path by the first on-off valve 61, the second on-off valve 62, and the third on-off valve 63 so that the magnetic substance can be affected, Since the measurement can be performed with the first LC oscillation circuit 1 and the second LC oscillation circuit 2 fixed, generation of noise in the LC oscillation circuits 1 and 2 can be prevented.
- a first modification of the third embodiment includes a data processing means 3 substantially similar to that of the third embodiment as shown in FIG. 15, and a first LC oscillation circuit 1 and a second This is a modification of the LC oscillation circuit 2 in which the configuration of the flow path through which the fluid flows is changed.
- a data processing means 3 substantially similar to that of the third embodiment as shown in FIG. 15, and a first LC oscillation circuit 1 and a second
- portions denoted by the same reference numerals as those in FIG. 2 represent the same components.
- the pipe 65 through which the fluid flows is configured to branch into a first pipe 65a and a second pipe 65b at an intermediate position and to merge on the downstream side, and switch the flow path to the branch point of the pipe 65.
- a first switching valve 66 is provided, and a second switching valve 67 for similarly switching a flow path is provided at a junction downstream of the pipe 65.
- the first coil 5 is fixed near the first pipe 65a or in the first pipe 65a, and a predetermined oscillation frequency (oscillation Wave) It is configured to oscillate.
- the second LC oscillation circuit 2 is configured such that the second coil 6 is fixed near the second pipe 65b or in the second pipe 65b, and a predetermined oscillation frequency (oscillation wave) is obtained by a circuit configuration including the second coil 6. It is configured to oscillate!
- the influence of the magnetic substance of the fluid is measured through the first coil 5 through the first coil 5 in substantially the same procedure as in the third embodiment.
- the difference in frequency (first data) is obtained by giving only to the circuit 1 to obtain the frequency difference (first data), and the difference in frequency (second data) is given to only the second LC oscillation circuit 2 via the second coil 6. Is measured and converted into the concentration of the magnetic substance from the comparison data.
- the first modification of the third embodiment it is possible to obtain substantially the same operation and effect as the third embodiment.
- the fluid path of the fluid can be opened and closed by the first switching valve 66 and the second switching valve 67 so that the first coil 5 and the second coil 6 can be affected by the magnetic material, the first LC oscillation circuit Since the measurement can be performed with the first and second LC oscillation circuits 2 fixed, it is possible to prevent noise from occurring in the LC oscillation circuits 1 and 2.
- a second modification of the third embodiment includes a data processing means 3 substantially similar to that of the third embodiment as shown in FIG.
- This is a modification of the LC oscillation circuit 2 in which the configuration of the flow path through which the fluid flows is changed.
- the portions denoted by the same reference numerals as in FIG. 2 represent the same components.
- the pipe 68 through which the fluid flows is provided with a U-shaped bent pipe 69 at an intermediate position, and the bent pipe 69 is configured to rotate by a driving means (not shown).
- the first LC oscillation circuit 1 has the bent pipe 69 when the bent pipe 69 is stopped on one side.
- the first coil 5 is fixed in the vicinity of the first coil 5, and is configured to oscillate a predetermined oscillation frequency (oscillation wave) by a circuit configuration including the first coil 5.
- the second LC oscillation circuit 2 fixes the second coil 6 in the vicinity of the bent pipe 69 when the bent pipe 69 is stopped on the other side, and performs a predetermined oscillation by a circuit configuration including the second coil 6. It is configured to oscillate a frequency (oscillation wave).
- the influence of the magnetic substance of the fluid is measured through the first coil 5 by the first LC oscillation in substantially the same procedure as in the third embodiment.
- the difference in frequency (first data) is obtained by giving only to the circuit 1 to obtain the frequency difference (first data), and the difference in frequency (second data) is given to only the second LC oscillation circuit 2 via the second coil 6. Is measured and converted into the concentration of the magnetic substance from the comparison data.
- the second modification of the third embodiment it is possible to obtain substantially the same operation and effect as the third embodiment.
- the flow path of the fluid can be switched by rotating the bent pipe 69 so that the magnetic material can influence the first coil 5 and the second coil 6, the first LC oscillation circuit 1 and the second LC Since the measurement can be performed with the oscillation circuit 2 fixed, it is possible to prevent noise from being generated in the LC oscillation circuits 1 and 2 at V.
- a third modification of the third embodiment includes a data processing means 3 substantially similar to that of the third embodiment as shown in FIG. 17, and a first LC oscillation circuit 70,
- the second LC oscillation circuit 71 is a modification of the configuration of the flow path through which the fluid flows.
- FIG. 17 the same symbols as those in FIG. 2 are used.
- the parts with numbers represent the same items.
- the first LC oscillation circuit 70 includes a first coil 72 disposed near or in the pipe 4 through which the fluid flows, and a position not affected by the magnetic substance in the fluid, or
- the first spare coil 73 is arranged at a position where the influence of the magnetic material is small, the first coil 72 and the first spare coil 73 can be selected by the first switch 74, and a predetermined oscillation frequency (oscillation wave) can be selected depending on the circuit configuration. It is configured to oscillate.
- the second LC oscillation circuit 71 is arranged substantially in parallel with the first LC oscillation circuit 70 along the direction in which the pipe 4 extends, and a second coil 75 is provided near or in the pipe 4.
- the second spare coil 76 at a position where the magnetic material in the fluid is not affected or at a position where the magnetic material in the fluid is less affected. It is made selectable by the two switches 77, and is configured to oscillate a predetermined oscillation frequency (oscillation wave) depending on the circuit configuration.
- the frequency is changed by the first coil 72 of the first LC oscillation circuit 70 by the first switch 74.
- the first switch 74 oscillates the frequency with the first spare coil 73 of the first LC oscillation circuit 70.
- the frequency is oscillated by the second coil 75 of the second LC oscillation circuit 71 by the first varnish switch 77 so that the first LC oscillation circuit 70 is not affected by the magnetic material,
- the influence of the magnetic material on the LC oscillation circuit 71 of FIG. By alternately switching the first switch 74 and the second switch 77, the same operation is repeated, and the concentration of the magnetic substance is continuously obtained.
- the influence of the magnetic substance of the fluid is measured through the first coil 72 through the first coil 72 in substantially the same procedure as in the third embodiment.
- the difference between the frequencies (second data) is given to only the second LC oscillation circuit 71 via the second coil 75, and the difference between the two frequencies (second data) is found. Measure and compare Data to the concentration of the magnetic substance.
- the circuit operation of the first coil 72 or the nicole 75 can be switched by switching the first switch 74 and the second switch 77 so that the magnetic material can affect the first coil 72 or the second coil 75.
- the measurement can be performed with the flow path fixed, so that a large-scale device is not required and the cost can be further reduced.
- a fourth modification of the third embodiment includes a data processing means 3 substantially similar to that of the third embodiment as shown in FIG.
- the LC oscillation circuit 81 of this embodiment is a modification of the configuration of the flow path through which the fluid flows.
- FIG. 18 the portions denoted by the same reference numerals as those in FIG. 2 represent the same components.
- the first LC oscillation circuit 80 includes a first coil 82 placed near or in the pipe 4 through which the fluid flows, and a position not affected by the magnetic substance in the fluid, or
- the spare coil 83 is arranged at a position where the influence of the magnetic material is small, and the first coil 82 and the spare coil 83 can be selected by the first switch 84 and the spare switch 85, and a predetermined oscillation frequency (oscillation wave) is determined by the circuit configuration. It is configured to oscillate.
- the second LC oscillation circuit 81 is arranged substantially in parallel with the first LC oscillation circuit 80 along the direction in which the pipe 4 extends, and the second coil 86 is arranged near or in the pipe 4. Connected to the reserve coil 83 of the first LC oscillation circuit 80, and the second coil 86 and the reserve coil 83 can be selected by the second switch 87 and the reserve switch 85. (Oscillation wave).
- the frequency is oscillated by the first coil 82 by the first switch 84 and the spare switch 85.
- the frequency is oscillated by the spare coil 83, which oscillates the frequency by the second coil 86 by the second switch 87 and the spare switch 85.
- the first LC oscillation circuit 80 has an effect of the magnetic material
- the second LC oscillation circuit 81 has no influence of the magnetic material.
- the frequency is oscillated by the first coil 82 by the first switch 84 and the spare switch 85.
- the frequency is oscillated by the auxiliary coil 83 and the frequency is oscillated by the second switch 86 by the second switch 87.
- the first LC oscillation circuit 80 is not affected by the magnetic material
- the second LC oscillation circuit 81 is affected by the magnetic material.
- the same operation is repeated by alternately switching the first switch 84, the second switch 87, and the spare switch 85, and the concentration of the magnetic substance is continuously obtained.
- the influence of the magnetic substance of the fluid is measured through the first coil 82 through the first coil 82 in substantially the same procedure as in the third embodiment.
- the difference between the frequencies (second data) is obtained by giving only to the circuit 80 to obtain the frequency difference (first data), and the difference between the frequencies (second data) is given to only the second LC oscillation circuit 81 via the second coil 86. Is measured and converted into the concentration of the magnetic substance from the comparison data.
- the circuit of the first coil 82 or the second coil 86 is switched by switching the first switch 84, the second switch 87, and the spare switch 85 so that the magnetic material can affect the first coil 82 or the second coil 86.
- the operation is switchable, the measurement can be performed with the flow path fixed, so that the configuration of a large-scale apparatus is unnecessary, and the cost can be further reduced.
- FIG. 19 is a flowchart showing an example of processing of zero point compensation in the fourth embodiment of the present invention
- FIG. 20 is a schematic diagram showing the configuration of the flow path and the LC oscillation circuit in the fourth embodiment of the present invention
- FIG. FIG. 22 is a graph showing the relationship between the deviation of the zero point and the concentration of the magnetic material in the fourth embodiment of the present invention.
- FIGS. 22 to 24 show first and second modifications of the fourth embodiment of the present invention, respectively.
- the magnetic substance concentration measuring apparatus and the zero point correction method of the fourth embodiment include a first LC oscillation circuit 1, a second LC oscillation circuit 2, and a first embodiment as shown in Figs. And data processing means 3 (see Fig. 2) which is almost the same as the above.
- FIG. 19 and FIG. 21 portions denoted by the same reference numerals as in FIG. 2 represent the same components.
- the first LC oscillation circuit 1 fixes the first coil 5 in the vicinity of or in the pipe 90 through which the fluid flows, and generates a predetermined oscillation frequency (oscillation wave) by the circuit configuration including the first coil 5. It is configured to oscillate.
- the second LC oscillation circuit 2 extends along the direction in which the pipe 90 extends.
- the second coil 6 is fixed near the pipe 90 or in the pipe 90 substantially parallel to the first LC oscillation circuit 1, and a predetermined oscillation frequency (oscillation wave) is generated by the circuit configuration including the second coil 6. It is configured to oscillate.
- the pipe 90 through which the fluid flows has a first on-off valve 91 that can be opened and closed upstream of the position near the first coil 5, and a position near the first coil 5 and a position near the second coil 6.
- a second on-off valve 92 that can be opened and closed between them, and a third on-off valve 93 that can be opened and closed downstream from a position near the second coil 6.
- the first LC oscillation circuit 1 and the second LC oscillation circuit 2 may be configured so that the frequencies are different from each other within a range of several tens of%! It may be configured to!
- the circuit configuration of the first LC oscillation circuit 1 and the circuit configuration of the second LC oscillation circuit 2 may be of any type such as a collector type, a Hartley type, a Colpitts type, etc. Is preferred.
- the oscillation frequency f is changed by changing the inductance L of each coil. Note that, in each of the LC oscillation circuits 1 and 2, there is no correlation between the frequency f and the impedance Z.
- the data processing means 3 is connected to the first LC oscillation circuit 1 and the second LC oscillation circuit 2 as shown in FIG.
- the data processing means 3 includes a first FZV converter (frequency / voltage converter 11 and a second LC oscillator A second FZV converter (frequency-voltage converter) 12 that is connected to the circuit 2 and converts a frequency into a voltage signal, and is connected to the first FZV converter 11 and the second FZV converter 12 so that the A preceding processor 13 for calculating the difference (difference in measurement data), and a later processor connected to the preceding processor 13 and receiving comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value in advance. And a magnetic substance concentration display 10 that can be displayed on a screen by being connected to a processing unit 14 at the subsequent stage. Furthermore, the data processing means 3 includes a first LC oscillation circuit 1 as shown in FIG.
- the first pulse counter 15 which is connected to The second pulse counter 16 is connected to the circuit 2 and converts the frequency to a numerical value.
- the second pulse counter 16 is connected to the first pulse counter 15 and the second pulse counter 16 to calculate the difference between the two values (the difference in the measured data).
- the latter-stage processor 18 connected to the former-stage processor 17, and inputting contrast data indicating the correlation between the concentration of the magnetic substance and the numerical value in advance, and the latter-stage processor 18. It may be provided with a magnetic substance concentration indicator 10 that can be connected and display a screen.
- the configuration of the processing means 3 may be configured as a single device or may be configured separately. Then, it may be composed of a predetermined combination.
- Step S12 When measuring the concentration of the magnetic substance contained in the fluid, from the start of the measurement (step S11 in Fig. 19; hereinafter, each step is shown in Fig. 19), it is determined whether the zero point should be checked first. (Step S12). When the zero point is to be confirmed, the process proceeds to the next step (step S13). When the zero point is not to be confirmed, the frequency difference is determined so as to determine the concentration of the magnetic substance (step S17). Move to.
- the confirmation of the zero point may be performed at predetermined time intervals, or an arbitrary time may be set.
- first LC oscillating circuit 1 and the second LC oscillating circuit 2 operate at an oscillation frequency including disturbances such as magnetic noise, electromagnetic wave noise, temperature change, electric noise, and a signal due to the influence of a magnetic material.
- each frequency is sent to the processor 7 before the processing means 3 and the difference between the frequency of the first LC oscillation circuit 1 and the frequency of the second LC oscillation circuit 2 is measured. Then, the frequency difference (measurement data difference) is recognized as a zero point (step S15), and recorded by the preceding processor 7 (step S16).
- the frequency difference (measurement data difference) is a fixed predetermined value when the zero point is not displaced, and when the zero point is displaced, the value of the constant value increases and decreases.
- the graph in Fig. 21 shows the case where the position of the zero point has shifted, and the concentration of the magnetic substance (moving from G 'to G in Fig. 21) has shifted accordingly.
- the first LC oscillation circuit 1 oscillates an oscillation frequency (oscillation wave) including disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise
- the second LC oscillation circuit 2 Oscillates an oscillating frequency (oscillation wave) including disturbances such as magnetic noise, electromagnetic noise, temperature change, and electric noise, and sends each frequency to the processor 7 in the preceding stage of the processing means 3,
- the difference between the frequency of the first LC oscillation circuit 1 and the frequency of the second LC oscillation circuit 2 is measured (step S18), and recognized as a frequency difference (measurement data difference) (step S19).
- the difference (measurement data difference) is recorded by the preceding processor 7 (step S20). If the difference is recognized as a frequency difference (measurement data difference) (step 19), the process proceeds to step 20 while returning to the zero point confirmation process (step 12), where the process is continuously performed. ing.
- step S21 the difference between the frequency (difference in the measured data) when the magnetic material of the fluid affects only the first LC oscillation circuit 1 and the zero point obtained in steps S13 to S16 is calculated. It is obtained and used as the final measured value (step S21).
- the final measured value is obtained by canceling the deviation of the zero point by subtracting the zero point including the deviation.
- the processing of steps S13-S16 in which the zero point is obtained may be performed in the reverse order of the processing of steps S17-S20.
- the final measurement value is passed through the FZV converter 8 and the like, and processed by the subsequent processor 9 to provide comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value, and a voltage signal (difference in voltage value). Then, the concentration of the magnetic substance is converted into a magnetic substance concentration (step S22), and the magnetic substance concentration indicator 10 indicates the concentration of the magnetic substance in the fluid.
- the fourth embodiment substantially the same operation and effect as those of the first embodiment can be obtained, and the deviation of the zero point can be eliminated, so that the concentration measurement of the magnetic material can be easily performed. it can.
- the zero point can be automatically measured at the desired timing to eliminate the deviation of the zero point, it is easy to correct the zero point without having to calibrate the zero point before starting the measurement every time. Can be used.
- the first on-off valve 91, the second on-off valve 92, and the third on-off valve 93 can open and close the fluid flow path so that the first coil 5 and Z or the second coil 6 can be affected by the magnetic substance. With this configuration, measurement can be performed with the first LC oscillation circuit 1 and the second LC oscillation circuit 2 fixed, so that noise can be prevented from being generated in the LC oscillation circuits 1 and 2.
- a measurement value in which the change of the zero point is corrected is automatically obtained, so that operation and maintenance are facilitated, measurement accuracy is improved, and as a result, Use of a zero-point standard material with a clear concentration can be eliminated.
- a first modification of the fourth embodiment includes a data processing means 3 substantially similar to that of the fourth embodiment as shown in FIG. 22, and a first LC oscillation circuit 1 and a second This is a modification of the LC oscillation circuit 2 in which the configuration of the flow path through which the fluid flows is changed.
- a data processing means 3 substantially similar to that of the fourth embodiment as shown in FIG. 22, and a first LC oscillation circuit 1 and a second
- portions denoted by the same reference numerals as those in FIG. 2 represent the same components.
- the pipe 95 through which the fluid flows has a U-shaped bent pipe 96 at an intermediate position, and the bent pipe 96 is configured to rotate by driving means (not shown).
- the first coil 5 is fixed near the bent pipe 96 when the bent pipe 96 is stopped on one side, and a predetermined configuration is provided by the circuit configuration including the first coil 5. It is configured to oscillate the oscillation frequency (oscillation wave).
- the second LC oscillation circuit 2 is configured such that the second coil 6 is fixed near or in a normal pipe 95 located on the downstream side of the bent pipe 96, and a predetermined configuration is provided by a circuit configuration including the second coil 6. It is configured to oscillate the oscillation frequency (oscillation wave).
- the influence of the magnetic substance of the fluid is determined by the first LC oscillation circuit 1 and the second LC
- the difference between the frequencies (measured value data) is given to the oscillation circuit 2
- the frequency difference (measured value data) is recognized as the zero point
- the influence of the magnetic substance is given only to the second LC oscillation circuit 2.
- the frequency difference (measured value data) from the first LC oscillator circuit is recorded, and the frequency difference (measured data difference) when only the second LC oscillator circuit 2 is affected by the magnetic material and zero Find the difference from the point and convert it to the concentration of the magnetic substance from the comparison data.
- the flow path of the fluid can be switched by rotating the bent pipe 96 so that the magnetic material can affect the first coil 5 and / or the second coil 6, the first LC oscillation circuit 1 and the second Since the measurement can be performed while fixing the LC oscillation circuit 2, noise can be prevented from being generated in the LC oscillation circuits 1 and 2.
- a second modification of the fourth embodiment includes a data processing means 3 substantially similar to that of the fourth embodiment as shown in FIG.
- the LC oscillation circuit 102 of this embodiment is obtained by changing the configuration of a flow path through which a fluid flows.
- FIG. 23 portions denoted by the same reference numerals as in FIG. 2 represent the same components.
- the first LC oscillation circuit 101 is configured such that a first coil 103 is arranged near or in the pipe 4 through which a fluid flows, and oscillates at a predetermined oscillation frequency (oscillation wave) depending on the circuit configuration. Have been. Also, the second LC oscillation circuit 102 The second coil 104 is disposed near the pipe 4 or in the pipe 4 substantially in parallel with the vibration circuit 101, and at the position not affected by the magnetic substance in the fluid or the influence of the magnetic substance in the fluid. The spare coil 105 is arranged at a small number of positions, the second coil 104 and the spare coil 105 can be selected by the switch 106, and a predetermined oscillation frequency (oscillation wave) is oscillated by a circuit configuration.
- the frequency is oscillated by the first coil 103 as shown in FIG.
- the second coil 104 By causing the second coil 104 to oscillate the frequency in accordance with 06, the magnetic material affects both the first LC oscillation circuit 101 and the second LC oscillation circuit 102.
- the influence of the magnetic substance of the fluid is applied only to the first LC oscillation circuit 101, the frequency is oscillated by the first coil 103 and the frequency is oscillated by the spare coil 105 by the switch 106. Accordingly, the first LC oscillation circuit 101 is not affected by the magnetic material, and the second LC oscillation circuit 102 is not affected by the magnetic material. By switching the switch 106, the same operation is repeated, and the concentration of the magnetic substance is continuously obtained.
- the effect of the magnetic substance of the fluid is measured by the first LC oscillation circuit 101 and the second LC
- the difference between the frequencies (measured value data) is given to the oscillation circuit 102, the frequency difference (measured value data) is recognized as a zero point, and the influence of the magnetic substance is detected by the switch 106 using the first LC oscillation circuit 101.
- Frequency difference (measured value data) from the second LC oscillation circuit and record the frequency difference when only the first LC oscillation circuit 101 is affected by the magnetic material (measured data difference).
- the difference between the zero point are calculated, and converted to the concentration of the magnetic substance from the comparison data.
- the circuit operation of the first coil 103 and / or the second coil 104 can be switched by switching the switch 106 so that the magnetic material can affect the first coil 103 and / or the second coil 104, Since measurement can be performed with the flow path fixed, a large-scale device configuration is not required, and the cost can be further reduced.
- FIG. 24 is a flowchart showing the zero point compensation process in the fifth embodiment of the present invention
- FIG. 25 is a schematic diagram showing the configuration of the flow path and the LC oscillation circuit in the fifth embodiment of the present invention
- FIGS. FIG. 26 is a view similar to FIG. 25, showing first and second modifications of the fifth embodiment of the present invention.
- the magnetic substance concentration measuring apparatus and the zero point correction method of the fifth embodiment include a first LC oscillation circuit 1 and a second LC oscillation circuit 2 as shown in Figs. And data processing means 3 (see Fig. 2) which is almost the same as the above.
- FIGS. 24 and 25 portions denoted by the same reference numerals as those in FIG. 2 represent the same components.
- the first LC oscillation circuit 1 fixes the first coil 5 in the vicinity of or in the pipe 110 through which a fluid flows, and has a predetermined oscillation frequency (oscillation wave) by a circuit configuration including the first coil 5.
- the second LC oscillation circuit 2 includes the second coil 6 by fixing the second coil 6 at a position not affected by the magnetic material in the fluid or at a position less affected by the magnetic material in the fluid. It is configured to oscillate a predetermined oscillation frequency (oscillation wave) by the circuit configuration.
- the pipe 110 through which the fluid flows has a first on-off valve 111 that can be opened and closed on the upstream side of the position near the first coil 5 and a second on-off valve 111 that can be opened and closed on the downstream side of the position near the first coil 5.
- Two on-off valves 1 and 12 are provided.
- the first LC oscillation circuit 1 and the second LC oscillation circuit 2 may be configured so that the frequencies are different from each other in a range of several tens of%! It may be configured to!
- the circuit configuration of the first LC oscillation circuit 1 and the circuit configuration of the second LC oscillation circuit 2 may be of any type such as a collector type, a Hartley type, a Colpitts type, etc. Is preferred.
- the oscillation frequency f is changed by changing the inductance L of each coil. Note that, in each of the LC oscillation circuits 1 and 2, there is no correlation between the frequency f and the impedance Z.
- the data processing means 3 is connected to the first LC oscillation circuit 1 and the second LC oscillation circuit 2 as shown in FIG.
- a processor 7 at the previous stage for obtaining the beat period due to the resonance phenomenon of both oscillation waves an FZV converter (frequency / voltage conversion) 8 connected to the processor 7 at the previous stage and converting the frequency to a voltage signal, and an FZV converter 8 And a magnetic substance concentration indicator 10 connected to the latter stage and connected to the latter stage processor 9 and capable of displaying a screen. It has.
- the data processing means 3 includes a first FZV converter (frequency / voltage converter 11 and a second LC oscillator A second FZV converter (frequency-voltage converter) 12 that is connected to the circuit 2 and converts a frequency into a voltage signal, and is connected to the first FZV converter 11 and the second FZV converter 12 so that the A preceding processor 13 for calculating the difference (difference in measurement data), and a later processor connected to the preceding processor 13 and receiving comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value in advance. And a magnetic substance concentration display 10 that can be displayed on a screen by being connected to a processing unit 14 at the subsequent stage. Furthermore, the data processing means 3 includes a first LC oscillation circuit 1 as shown in FIG.
- the first pulse counter 15 which is connected to The second pulse counter 16 is connected to the circuit 2 and converts the frequency to a numerical value.
- the second pulse counter 16 is connected to the first pulse counter 15 and the second pulse counter 16 to calculate the difference between the two values (the difference in the measured data).
- the latter-stage processor 18 connected to the former-stage processor 17, and inputting contrast data indicating the correlation between the concentration of the magnetic substance and the numerical value in advance, and the latter-stage processor 18. It may be provided with a magnetic substance concentration indicator 10 that can be connected and display a screen.
- the configuration of the processing means 3 may be configured as a single device or may be configured separately. Then, it may be composed of a predetermined combination. [0179] Hereinafter, the operation of the fifth embodiment will be described.
- Step S32 When measuring the concentration of the magnetic substance contained in the fluid, from the start of measurement (step S31 in Fig. 24; hereinafter, each step is shown in Fig. 24), it is determined whether to perform zero point confirmation first. (Step S32). When checking the zero point, proceed to the next process (step S33) .When not checking the zero point, proceed to the process for calculating the frequency difference so as to obtain the concentration of the magnetic substance (step S37). Transition.
- the confirmation of the zero point may be performed at predetermined time intervals, or an arbitrary time may be set.
- the influence of the magnetic material of the fluid is prevented from being exerted on the first LC oscillation circuit 1 (step S33).
- the first LC oscillation circuit 1 and the second LC oscillation circuit 2 oscillate an oscillation frequency (oscillation wave) including disturbances such as magnetic noise, electromagnetic wave noise, temperature change, and electrical noise.
- the respective frequencies are sent to the processor 7 in the preceding stage of the processing means 3, and the difference between the frequency of the first LC oscillation circuit 1 and the frequency of the second LC oscillation circuit 2 is measured (step S34).
- the frequency difference (measurement data difference) is recognized as a zero point (step S35), and recorded by the preceding processor 7 (step S36).
- the difference in frequency (difference in measurement data) is a fixed predetermined value when there is no deviation in the zero point, and the value increases or decreases when the zero point is deviated.
- the fluid is introduced into the pipe 110 at a position near the first coil 5, and the influence of the magnetic substance of the fluid is reduced by the first
- the signal is supplied only to the first LC oscillation circuit 1 via the coil 5 (step S37).
- the first LC oscillation circuit 1 oscillates an oscillation frequency (oscillation wave) including a signal due to the influence of the magnetic material together with disturbances such as magnetic noise, electromagnetic noise, temperature change, and electrical noise, and simultaneously.
- the second LC oscillation circuit 2 oscillates an oscillation frequency (oscillation wave) including disturbances such as magnetic noise, electromagnetic noise, temperature change, and electrical noise, thereby processing each frequency before the processing means 3.
- an oscillation frequency oscillation wave
- the processor 7 measures the difference between the frequency of the first LC oscillation circuit 1 and the frequency of the second LC oscillation circuit 2 (step S38), and recognizes it as a frequency difference (difference in measurement data).
- the frequency difference (measurement data difference) is recorded by the preceding processor 7 (Step S40).
- the difference is recognized as a frequency difference (difference in measurement data) (step S39)
- the process proceeds to step S40, while returning to the process of checking the zero point (step S32), and the process is continuously performed. Yes.
- step S41 the difference between the frequency difference (measurement data difference) when the magnetic material of the fluid affects only the first LC oscillation circuit 1 and the zero point obtained in steps S33—S36 is calculated. It is obtained and used as the final measured value (step S41).
- the final measured value is obtained by canceling the deviation of the zero point by subtracting the zero point including the deviation.
- the processing of steps S33-S36 in which the zero point was obtained may be performed in the reverse order of the processing of steps S37-S40.
- the final measurement value is passed through an FZV converter 8 and the like, and processed by a subsequent processor 9 to provide comparison data indicating the correlation between the concentration of the magnetic substance and the voltage value, and a voltage signal (difference in voltage value). Is converted to a magnetic substance concentration (step S42), and the magnetic substance concentration indicator 10 indicates the concentration of the magnetic substance in the fluid.
- the fifth embodiment substantially the same operation and effect as those of the first embodiment can be obtained, the deviation of the zero point can be eliminated, and the concentration measurement of the magnetic material can be easily performed. it can.
- the zero point can be automatically measured at the desired timing to eliminate the deviation of the zero point, it is easy to correct the zero point without having to calibrate the zero point before starting the measurement every time. Can be used.
- the first on-off valve 111 and the second on-off valve 112 are configured to open and close the fluid flow path so that the first coil 5 and Z or the second coil 6 can be affected by the magnetic material, the first Since the measurement can be performed with the LC oscillation circuit 1 and the second LC oscillation circuit 2 fixed, generation of noise in the LC oscillation circuits 1 and 2 can be prevented.
- a first modified example of the fifth embodiment includes a data processing means 3 substantially similar to that of the fifth embodiment as shown in FIG. 26, and a first LC oscillation circuit 1 and a second
- portions denoted by the same reference numerals as in FIG. 2 represent the same components.
- the pipe 115 through which the fluid flows has a U-shaped bent pipe 116 at an intermediate position, and the bent pipe 116 is configured to rotate by a driving means (not shown).
- the first LC oscillation circuit 1 is configured to bend the bent pipe 116 when one of the bent pipes 116 is stopped.
- the first coil 5 is fixed near 16, and is configured to oscillate at a predetermined oscillation frequency (oscillation wave) by a circuit configuration including the first coil 5.
- the second LC oscillation circuit 2 fixes the second coil 6 at a position where the position force on the downstream side of the bent pipe 116 is not affected by the magnetic substance in the fluid or at a position where the magnetic substance in the fluid is less affected. Then, the circuit configuration including the second coil 6 is configured to oscillate a predetermined oscillation frequency (oscillation wave).
- the influence of the magnetic substance of the fluid is measured by the first LC oscillation circuit 1 and the second LC
- the difference between the frequencies (measured value data) is recognized as the zero point by not giving it to the oscillation circuit 2, and the influence of the magnetic material is given only to the first LC oscillation circuit 1 to make it different from the first LC oscillation circuit.
- the difference between the frequency (measured value data) and the difference between the frequency (measured data difference) and the zero point when only the first LC oscillation circuit 1 is affected by the magnetic material is measured. Then, convert to the concentration of the magnetic substance from the comparison data.
- a second modification of the fifth embodiment includes a data processing means 3 substantially similar to that of the fifth embodiment as shown in FIG. 27, and includes a first LC oscillation circuit 121 and a second LC oscillation circuit 121.
- LC oscillation circuit 122, flow This is a modification of the configuration of the flow path through which the body flows.
- the portions denoted by the same reference numerals in FIG. 27 as those in FIG. 2 represent the same components.
- the first LC oscillation circuit 121 has a structure in which the first coil 123 is disposed near or in the pipe 4 through which the fluid flows, and at a position that is not affected by the magnetic substance in the fluid, or
- the spare coil 124 is arranged at a position where the influence of the body is small, the first coil 123 and the spare coil 124 can be selected by the switch 125, and a predetermined oscillation frequency (oscillation wave) is oscillated by the circuit configuration. It is configured.
- the second LC oscillation circuit 122 has a circuit configuration in which the second coil 126 is arranged at a position where the influence of the magnetic substance in the fluid from the pipe 4 is small or where the influence of the magnetic substance in the fluid is small. Thus, a predetermined oscillation frequency (oscillation wave) is oscillated.
- the frequency of the frequency is controlled by the switch 125 as shown in FIG. Is oscillated, so that the first LC oscillation circuit 121 and the second LC oscillation circuit 122 are not affected by the magnetic material.
- the frequency is oscillated by the first coil 123 by the switch 125, so that the first LC oscillation circuit 121 is magnetized.
- the second LC oscillation circuit 122 is not affected by the magnetic material while affecting the body. By switching the switch 125, the same operation is repeated, and the concentration of the magnetic substance is continuously obtained.
- the influence of the magnetic substance of the fluid is determined by the first LC oscillation circuit 121 and the second LC
- the frequency difference (measured value data) is recognized as a zero point, and the influence of the magnetic material is limited to only the first LC oscillation circuit 121 via the first coil 123 by the switch 125.
- the difference in frequency (measured value data) from the second LC oscillation circuit is recorded, and the frequency difference (difference in measurement data) when the influence of the magnetic material is applied only to the first LC oscillation circuit 121, The difference from the zero point is measured and converted into the concentration of the magnetic substance from the comparison data.
- a switch 1 is provided so that the magnetic material can affect only the first coil 123. If the circuit operation of the first coil 123 and the spare coil 124 can be switched by switching 25, measurement can be performed with the flow path fixed, so that a large-scale device configuration is not required and the cost can be further reduced. it can.
- the magnetic substance concentration measuring apparatus, the detection sensitivity improving method, the zero point compensation method, and the zero point correction method of the present invention are not limited to the above-described embodiments and modified examples, and assume that the fluid is oil. Force Other solution, water, gas, etc. may be used, if the concentration of the magnetic substance can be corrected using the frequency of the LC oscillation circuit, any combination of devices may be used, and the data difference is calculated. It is needless to say that the processing may be replaced with another method, and that various changes may be made without departing from the spirit of the present invention.
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JP2004091727A JP3682459B1 (ja) | 2004-03-26 | 2004-03-26 | 磁性体濃度計測装置、検出感度向上方法、ゼロ点補償方法及びゼロ点補正方法 |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5838162U (ja) * | 1981-09-09 | 1983-03-12 | 株式会社リコー | トナ−濃度検出回路 |
JPH0117630B2 (ja) * | 1983-03-08 | 1989-03-31 | Kyosan Electric Mfg | |
JPH03123926U (ja) * | 1990-03-29 | 1991-12-17 | ||
JPH05264495A (ja) * | 1992-03-18 | 1993-10-12 | Ngk Spark Plug Co Ltd | オイル劣化検出装置 |
JPH0742128Y2 (ja) * | 1984-04-03 | 1995-09-27 | エルサグ・インターナショナル・ビー・ブイ | ガス中の酸素濃度測定用の酸素検出器 |
JP2579413Y2 (ja) * | 1992-01-21 | 1998-08-27 | ティーディーケイ株式会社 | 磁気的検知装置 |
JP2847788B2 (ja) * | 1989-08-11 | 1999-01-20 | 日本電気株式会社 | セメント混合物中のセメント量の測定装置 |
JP2002005892A (ja) * | 2000-04-10 | 2002-01-09 | Randox Lab Ltd | 磁性粒子検出 |
-
2004
- 2004-03-26 JP JP2004091727A patent/JP3682459B1/ja not_active Expired - Lifetime
- 2004-11-08 WO PCT/JP2004/016523 patent/WO2005093403A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5838162U (ja) * | 1981-09-09 | 1983-03-12 | 株式会社リコー | トナ−濃度検出回路 |
JPH0117630B2 (ja) * | 1983-03-08 | 1989-03-31 | Kyosan Electric Mfg | |
JPH0742128Y2 (ja) * | 1984-04-03 | 1995-09-27 | エルサグ・インターナショナル・ビー・ブイ | ガス中の酸素濃度測定用の酸素検出器 |
JP2847788B2 (ja) * | 1989-08-11 | 1999-01-20 | 日本電気株式会社 | セメント混合物中のセメント量の測定装置 |
JPH03123926U (ja) * | 1990-03-29 | 1991-12-17 | ||
JP2579413Y2 (ja) * | 1992-01-21 | 1998-08-27 | ティーディーケイ株式会社 | 磁気的検知装置 |
JPH05264495A (ja) * | 1992-03-18 | 1993-10-12 | Ngk Spark Plug Co Ltd | オイル劣化検出装置 |
JP2002005892A (ja) * | 2000-04-10 | 2002-01-09 | Randox Lab Ltd | 磁性粒子検出 |
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JP3682459B1 (ja) | 2005-08-10 |
JP2005274511A (ja) | 2005-10-06 |
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