CN219608164U - Signal processing system for magnetostrictive level meter - Google Patents
Signal processing system for magnetostrictive level meter Download PDFInfo
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Abstract
The utility model provides a signal processing system for a magnetostrictive material level instrument, and relates to the technical field of signal processing. The system comprises a pulse current generator, a waveguide wire, a receiving coil, a signal amplifying circuit, a signal amplitude filter, a signal pulse width filter and a processing chip with a high-speed timer function; the pulse current generator is used for applying pulse current to the waveguide wire; the waveguide wire is used for generating a torsional wave signal when pulse current is loaded; the receiving coil is used for responding to the torsional wave signal to generate an induced voltage pulse signal; the signal amplifying circuit is used for amplifying the signal; the signal amplitude filter is used for carrying out amplitude filtering on the signal; the signal pulse width filter is used for performing pulse width filtering on the signal; the processing chip with the high-speed timer function is used for measuring the propagation time of the torsional wave signal according to the received signal. The system can accurately measure the propagation time of the torsional wave and ensure the measurement accuracy of the magnetostrictive material level instrument.
Description
Technical Field
The utility model relates to the technical field of signal processing, in particular to a signal processing system for a magnetostrictive material level instrument.
Background
The magnetostrictive material level meter is an instrument for measuring displacement and distance of an object according to the effect of magnetostriction Wei Deman, and the specific principle is that pulse current is loaded on a cylindrical magnetostrictive material (waveguide wire), a magnetic field is generated in the axial direction, a circumferential magnetic field (generated by an annular permanent magnet) is superposed in the axial vertical direction, when two magnetic fields meet, a stress torsion wave (Wei Deman effect) is generated, the torsion wave propagates along the waveguide wire at the speed of sound, after the torsion wave propagates to a receiving coil, an induced voltage pulse signal is generated in the coil according to the inverse effect of magnetostriction, and the displacement of the annular permanent magnet can be measured by measuring the propagation time of the torsion wave because the speed of the torsion wave is known.
In general, the pulse current generator and the receiving coil are located at the same position, after the pulse current propagates to the annular permanent magnet at an ultra-high speed, the generated torsional wave propagates back to the receiving coil at a sonic speed, so that the propagation time of the pulse current can be ignored, the generation of the pulse current is started, the torsion wave voltage signal of the receiving coil is stopped, and the displacement of the permanent magnet can be obtained by measuring the time difference, namely the propagation time of the torsional wave. If the measurement of the propagation time of the torsion wave is inaccurate, the measurement result of the displacement amount of the permanent magnet is directly inaccurate. Therefore, it is critical to ensure the accuracy of measuring the displacement amount of the permanent magnet to measure the propagation time of the torsion wave with high accuracy.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a signal processing system for a magnetostrictive material level instrument, so as to solve the problem of high-precision measurement of the propagation time of torsional waves.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a signal processing system for a magnetostrictive material level instrument, which comprises a pulse current generator, a waveguide wire, a receiving coil, a signal amplifying circuit, a signal amplitude filter, a signal pulse width filter and a processing chip with a high-speed timer function, wherein the signal amplitude filter is connected with the signal amplitude filter;
the pulse current generator is used for applying pulse current to the waveguide wire;
the waveguide wire is used for generating a torsional wave signal when pulse current is loaded and transmitting the torsional wave signal to the receiving coil;
the receiving coil is used for responding to the received torsional wave signal to generate an induced voltage pulse signal and transmitting the induced voltage pulse signal to the signal amplifying circuit;
the signal amplifying circuit is used for amplifying the received induced voltage pulse signal and transmitting the amplified signal to the signal amplitude filter;
the signal amplitude filter is used for carrying out amplitude filtering on the received signal so as to filter interference signals with amplitude values smaller than a preset filtering amplitude value, and transmitting the amplitude-filtered signals to the signal pulse width filter;
the signal pulse width filter is used for performing pulse width filtering on the received signal so as to filter interference signals with pulse width smaller than the preset time width, and transmitting the signals subjected to pulse width filtering to the processing chip with the high-speed timer function;
the processing chip with the high-speed timer function is used for measuring the propagation time of the torsional wave signal according to the received signal, and further comprises a first signal generator and a second signal generator, wherein the first signal generator is used for generating a pulse signal applied to the pulse current generator, and the second signal generator is used for generating a square wave signal applied to the signal pulse width filter.
Optionally, the pulse current generator includes a triode, the pulse signal generated by the first signal generator is applied to a gate of the triode, and then the pulse current is applied to the waveguide wire via the triode, and the frequency of the pulse signal is 200Hz and the pulse width is 5 μs.
Optionally, the signal amplitude filter includes a comparator, a first resistor and a second resistor, where the first resistor and the second resistor are connected in series, one end of the first resistor, which is not connected to the second resistor, is connected to a 5V dc voltage, one end of the second resistor, which is not connected to the first resistor, is grounded, the connection ends of the first resistor and the second resistor are simultaneously connected to the negative end of the comparator, the positive end of the comparator is connected to the output end of the signal amplifying circuit, and the preset filtering amplitude is determined by the resistances of the first resistor and the second resistor.
Optionally, the signal pulse width filter includes a first high-speed counter, a first nand gate, a second nand gate, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, the output end of the signal amplitude filter is connected to the first input end of the first nand gate, the second input end of the first nand gate is connected to the reset signal output end of the processing chip, the signal from the reset signal output end is used for resetting the signal pulse width filter, the output end of the first nand gate is connected to the second input end of the second nand gate, the first input end of the second nand gate is connected to the 3V dc voltage, the output end of the second nand gate is connected to the first input end of the first high-speed counter, the first output end of the first high-speed counter is connected to one end of the third resistor, the second output end of the first high-speed counter is connected to one end of the fourth resistor, the fourth output end of the first high-speed counter is connected to one end of the fifth resistor, the fourth output end of the first high-speed counter is connected to one end of the sixth resistor, the fourth output end of the fourth high-speed counter is connected to the third output end of the fifth resistor, the first high-speed counter is connected to the third output end of the third high-speed counter.
Optionally, the start of the second high-speed timer is triggered after the pulse current generator generates the pulse current of 36 μs to filter out the interference generated by the pulse current, and the signal from the output terminal of the third nand gate is used for down-regulating the edge to trigger the second high-speed timer to stop counting.
Optionally, the second signal generator is configured to generate a 1MHz square wave signal for application as a clock signal to the first high speed counter.
The beneficial effects of the utility model include:
the signal processing system for the magnetostrictive material level instrument comprises a pulse current generator, a waveguide wire, a receiving coil, a signal amplifying circuit, a signal amplitude filter, a signal pulse width filter and a processing chip with a high-speed timer function, wherein the signal pulse width filter is connected with the processing chip; the pulse current generator is used for applying pulse current to the waveguide wire; the waveguide wire is used for generating a torsional wave signal when pulse current is loaded and transmitting the torsional wave signal to the receiving coil; the receiving coil is used for responding to the received torsional wave signal to generate an induced voltage pulse signal and transmitting the induced voltage pulse signal to the signal amplifying circuit; the signal amplifying circuit is used for amplifying the received induced voltage pulse signal and transmitting the amplified signal to the signal amplitude filter; the signal amplitude filter is used for carrying out amplitude filtering on the received signal so as to filter interference signals with amplitude values smaller than a preset filtering amplitude value, and transmitting the amplitude-filtered signals to the signal pulse width filter; the signal pulse width filter is used for performing pulse width filtering on the received signal so as to filter interference signals with pulse width smaller than the preset time width, and transmitting the signals subjected to pulse width filtering to the processing chip with the high-speed timer function; the processing chip with the high-speed timer function is used for measuring the propagation time of the torsional wave signal according to the received signal, and further comprises a first signal generator and a second signal generator, wherein the first signal generator is used for generating a pulse signal applied to the pulse current generator, and the second signal generator is used for generating a square wave signal applied to the signal pulse width filter. The system can accurately measure the propagation time of the torsional wave and ensure the measurement accuracy of the magnetostrictive material level instrument.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a block diagram of a signal processing system for a magnetostrictive level meter according to an embodiment of the present utility model;
FIGS. 2A-2C show circuit diagrams of a signal processing system for a magnetostrictive level meter according to an embodiment of the present utility model;
FIG. 3 shows a signal measurement result diagram of a signal processing system for a magnetostrictive level meter according to an embodiment of the present utility model;
FIG. 4 shows a flowchart of the operation of the signal processing system for a magnetostrictive level meter provided by an embodiment of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The magnetostrictive material level meter is an instrument for measuring displacement and distance of an object according to the effect of magnetostriction Wei Deman, and the specific principle is that pulse current is loaded on a cylindrical magnetostrictive material (waveguide wire), a magnetic field is generated in the axial direction, a circumferential magnetic field (generated by an annular permanent magnet) is superposed in the axial vertical direction, when two magnetic fields meet, a stress torsion wave (Wei Deman effect) is generated, the torsion wave propagates along the waveguide wire at the speed of sound, after the torsion wave propagates to a receiving coil, an induced voltage pulse signal is generated in the coil according to the inverse effect of magnetostriction, and the displacement of the annular permanent magnet can be measured by measuring the propagation time of the torsion wave because the speed of the torsion wave is known. In general, the pulse current generator and the receiving coil are located at the same position, and after the pulse current propagates to the annular permanent magnet at the speed of light, the generated torsional wave propagates back to the receiving coil at the speed of sound, so that the propagation time of the pulse current can be ignored, the generation of the pulse current is started, the torsion wave voltage signal of the receiving coil is stopped, and the displacement of the permanent magnet can be obtained by measuring the time difference, namely the propagation time of the torsional wave. The utility model provides a high-precision torsional wave timing measurement system aiming at the signal processing problem of a magnetostrictive material level instrument.
FIG. 1 shows a block diagram of a signal processing system for a magnetostrictive level meter according to an embodiment of the present utility model; fig. 2A to 2C show circuit diagrams of a signal processing system for a magnetostrictive level meter according to an embodiment of the present utility model.
As shown in fig. 1, the signal processing system for the magnetostrictive level meter provided by the utility model comprises a pulse current generator 101, a waveguide wire 102, a receiving coil 103, a signal amplifying circuit 104, a signal amplitude filter 105, a signal pulse width filter 106, a processing chip 107 with a high-speed timer function, and the processing chip 107 with the high-speed timer function is an MCU.
The pulse current generator 101 is used to apply a pulse current to the waveguide wire 102. Alternatively, the pulse current generator 101 includes a triode, and the pulse signal generated by the first signal generator is applied to the gate of the triode, and then the pulse current is applied to the waveguide wire 102 via the triode, and the frequency of the pulse signal is 200Hz and the pulse width is 5 μs.
Fig. 2A is a circuit diagram showing a connection relationship between the pulse current generator 101 and the waveguide wire 102. In fig. 2A, P3 represents a waveguide wire, to which a pulse current is applied through a transistor Q1, a pulse signal is generated by the MCU (i.e., the processing chip 107 with a high-speed timer function), the frequency is 200Hz, the pulse width is 5 μs, and the pin MCU 5us 200Hz represents a first signal generator of the MCU.
The waveguide wire 102 is used to generate a torsional wave signal when a pulse current is applied thereto, and propagate the torsional wave signal to the receiving coil 103. The receiving coil 103 is used for generating an induced voltage pulse signal in response to the received torsional wave signal, and transmitting the induced voltage pulse signal to the signal amplifying circuit 104. Fig. 2B is a circuit diagram of the connection relationship of the receiving coil 103, the signal amplifying circuit 104, the signal amplitude filter 105, and the signal pulse width filter 106. As shown in fig. 2B, P1 represents a receiving coil 103, which receives the torsional wave signal and sends the torsional wave signal to a signal amplifier U1 (i.e., a signal amplifying circuit 104) for amplifying, and a resistor R36 can adjust the amplification factor.
The signal amplification circuit 104 is configured to amplify the received induced voltage pulse signal, and the amplified signal is transmitted to the signal amplitude filter 105. Optionally, the signal amplitude filter 105 includes a comparator, and a first resistor and a second resistor, where the first resistor and the second resistor are connected in series, and one end of the first resistor, which is not connected to the second resistor, is connected to the 5V dc voltage, one end of the second resistor, which is not connected to the first resistor, is grounded, the connection ends of the first resistor and the second resistor are simultaneously connected to the negative end of the comparator, the positive end of the comparator is connected to the output end of the signal amplifying circuit, and the preset filtering amplitude is determined by the resistance values of the first resistor and the second resistor.
Specifically, as shown in fig. 2B, the amplified signal enters an amplitude filter (i.e., signal amplitude filter 105) composed of a comparator U6A and resistors R26 and R16, and functions to filter out interference with smaller amplitude values, and the filter amplitude is set according to the partial voltages of R26 and R16.
The signal amplitude filter 105 is used for performing amplitude filtering on the received signal to filter out an interference signal with an amplitude value smaller than a preset filtering amplitude, and transmitting the amplitude-filtered signal to the signal pulse width filter 106. The signal pulse width filter 106 is used for performing pulse width filtering on the received signal to filter out the interference signal with the pulse width smaller than the preset time width, and transmitting the signal with the pulse width filtered to the processing chip 107 with the high-speed timer function. The processing chip with high-speed timer function 107 is configured to measure a propagation time of a torsional wave signal based on the received signal, and the processing chip with high-speed timer function 107 further includes a first signal generator configured to generate a pulse signal applied to the pulse current generator and a second signal generator configured to generate a square wave signal applied to the signal pulse width filter.
Optionally, the signal pulse width filter 106 includes a first high-speed counter, a first nand gate, a second nand gate, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, the output end of the signal amplitude filter is connected to the first input end of the first nand gate, the second input end of the first nand gate is connected to the reset signal output end of the processing chip, the signal from the reset signal output end is used for resetting the signal pulse width filter, the output end of the first nand gate is connected to the second input end of the second nand gate, the first input end of the second nand gate is connected to the 3V dc voltage, the output end of the second nand gate is connected to the first input end of the first high-speed counter, the first output end of the first high-speed counter is connected to one end of the third resistor, the third output end of the first high-speed counter is connected to one end of the fourth resistor, the fourth output end of the first high-speed counter is connected to one end of the fifth resistor, the fourth output end of the first high-speed counter is connected to one end of the sixth resistor, the third output end of the third high-speed counter is connected to the third high-speed counter, the third output end of the third high-speed counter is connected to the third high-speed counter. Optionally, the start of the second high-speed timer is triggered after the pulse current generator generates the pulse current of 36 μs to filter out the interference generated by the pulse current, and the signal from the output terminal of the third nand gate is used for down-regulating the edge to trigger the second high-speed timer to stop counting. Optionally, the second signal generator is configured to generate a 1MHz square wave signal for application as a clock signal to the first high speed counter.
Specifically, as shown in fig. 2B, the signal after amplitude filtering enters a pulse width filter (i.e. a signal pulse width filter 106) formed by a nand gate U11B, U11B, U D and a high-speed counter U18, a 1MHz square wave (generated by a second signal generator) is generated by the MCU and is used as a clock signal to enter the counter U18, after the U6A outputs 5V high level, the U18 starts counting according to the clock signal, and outputs the clock signal as Q1, Q2, Q3 and TC pins, the corresponding count values 1, 2, 4 and 8 are in μs, a certain pin is arbitrarily selected, the input nand gate U11B can make the counter U18 enter a hold mode, the output pin can not be turned over any more, and the resistors R64A, R64B, R C and R64D can be used for setting the filtering time, and one of them is selected for use. Fig. 2C is a pin diagram of the processing chip 107 with the high-speed timer function, and as shown in fig. 2C, the MCU counter pin enters the MCU (i.e., the processing chip 107 with the high-speed timer function), the down-regulating edge triggers the high-speed timer of the MCU to stop timing, and the high-speed timer of the MCU is used to measure the propagation time of the torsional wave, and the start of the high-speed timer is triggered after the generation of the pulse current 36 μs to filter the interference generated by the pulse current. The MCU reset pin is used to reset the pulse width filter (i.e., the signal pulse width filter 106).
FIG. 3 shows a signal measurement result diagram of a signal processing system for a magnetostrictive level meter according to an embodiment of the present utility model. As shown in fig. 3, curve 1 represents a pulse current of 5 μs, curve 2 is an amplified signal, the peak on the left side of the signal is an interference caused by the pulse current, the peak on the right side of the signal should be filtered, the peak on the right side of the signal is a torsional wave signal, and the displacement of the permanent magnet can be obtained by measuring the time difference between the torsional wave signal and the pulse current. When the level meter is actually used, a lot of interference exists, and the filtering processing can be performed in terms of amplitude, width and time correlation of signals.
In summary, the system generates a torsional wave signal when pulse current is loaded through the waveguide wire, the receiving coil responds to the received torsional wave signal to generate an induced voltage pulse signal, then the signal is amplified, amplitude filtered and pulse width filtered, and finally the processing chip measures the propagation time of the torsional wave signal. The pulse signal for generating the pulse current, the square wave signal for pulse width filtering, the receiving signal and the measuring of the propagation time are all completed by the same processing chip, so that the propagation time of the torsion wave can be accurately measured, and the measuring precision of the magnetostrictive level instrument is ensured.
The workflow of the magnetostrictive level meter signal processing system is given by fig. 4. The pin MCU 5 μS 200Hz represents a first signal generator of the MCU for generating a pulse current with a pulse width of 5 μS and a frequency of 200Hz. The pin MCU 1MHz represents a second signal generator of the MCU, which generates a clock signal with the frequency of 1MHz for the pulse width filter. The pin MCU counter represents a second high-speed timer of the MCU, counts the outside, and is used for measuring the propagation time of the torsional wave, and the resolution is 0.05 mu S. The propagation speed of the torsion wave is 2777m/S, the time for detecting the length of 1mm is 0.36 mu S, and in order to eliminate the interference caused by the pulse current, the high-speed timer of the MCU starts to count after generating the pulse current of 36 mu S, and the descending edge of the counter pin of the MCU triggers the second high-speed timer of the MCU to stop counting.
Optionally, the system may also load a correlation filter processing algorithm. The correlation filtering considers that the interference is randomly generated under the same measuring condition, and the signal is constant, so that the random interference can be filtered by taking the nearest two values of the propagation time values of the 5 continuously recorded torsional waves and carrying out average value operation on the values. The output measurement result is displacement L, unit mm, propagation time of torsion wave is t, unit mu S, pulse width filter length is n, unit mu S, propagation speed of torsion wave is 2.777 mm/mu S, and the displacement calculation formula is
L＝(t+36-n)×2.777。
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, but not limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (6)
1. The signal processing system for the magnetostrictive material level meter is characterized by comprising a pulse current generator, a waveguide wire, a receiving coil, a signal amplifying circuit, a signal amplitude filter, a signal pulse width filter and a processing chip with a high-speed timer function;
the pulse current generator is used for applying pulse current to the waveguide wire;
the waveguide wire is used for generating a torsional wave signal when pulse current is loaded and transmitting the torsional wave signal to the receiving coil;
the receiving coil is used for responding to the received torsional wave signal to generate an induced voltage pulse signal and transmitting the induced voltage pulse signal to the signal amplifying circuit;
the signal amplifying circuit is used for amplifying the received induced voltage pulse signal and transmitting the amplified signal to the signal amplitude filter;
the signal amplitude filter is used for carrying out amplitude filtering on the received signal so as to filter interference signals with amplitude values smaller than a preset filtering amplitude value, and transmitting the amplitude-filtered signals to the signal pulse width filter;
the signal pulse width filter is used for performing pulse width filtering on the received signal so as to filter interference signals with pulse width smaller than the preset time width, and transmitting the signals subjected to pulse width filtering to the processing chip with the high-speed timer function;
the processing chip with the high-speed timer function is used for measuring the propagation time of the torsional wave signal according to the received signal, and further comprises a first signal generator and a second signal generator, wherein the first signal generator is used for generating a pulse signal applied to the pulse current generator, and the second signal generator is used for generating a square wave signal applied to the signal pulse width filter.
2. The signal processing system for a magnetostrictive level meter according to claim 1, wherein the pulse current generator comprises a triode, the pulse signal generated by the first signal generator is applied to a gate of the triode, and then a pulse current is applied to the waveguide wire via the triode, the pulse signal having a frequency of 200Hz and a pulse width of 5 μs.
3. The signal processing system for a magnetostrictive level meter according to claim 1, wherein the signal amplitude filter comprises a comparator and a first resistor and a second resistor, the first resistor and the second resistor are connected in series, one end of the first resistor, which is not connected to the second resistor, is connected to a 5V dc voltage, one end of the second resistor, which is not connected to the first resistor, is grounded, the connection end of the first resistor and the second resistor is simultaneously connected to the negative end of the comparator, the positive end of the comparator is connected to the output end of the signal amplifying circuit, and the preset filter amplitude is determined by the resistance values of the first resistor and the second resistor.
4. The signal processing system for a magnetostrictive level meter according to claim 1, wherein the signal pulse width filter comprises a first high-speed counter, a first nand gate, a second nand gate, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor, the output of the signal amplitude filter is connected to the first input of the first nand gate, the second input of the first nand gate is connected to the reset signal output of the processing chip, the signal from the reset signal output is used to reset the signal pulse width filter, the output of the first nand gate is connected to the second input of the second nand gate, the first input of the second nand gate is connected to the first input of the first high-speed counter, the first output of the first high-speed counter is connected to one end of the third resistor, the second output of the first high-speed filter is connected to the reset signal output of the processing chip, the signal from the reset signal output is used to reset the signal pulse width filter, the output of the first nand gate is connected to the second input of the second nand gate, the first input of the second nand gate is connected to the 3 vdc voltage, the output of the second nand gate is connected to the first input of the first high-speed counter, the first output of the first high-speed counter is connected to the first output of the third resistor, the first high-speed counter is connected to the third high-speed counter, the first output of the fifth resistor is connected to the third high-speed counter, the fifth resistor is connected to the first output of the fifth high-speed counter, the output of the first high-speed counter is connected to the third high-speed counter, the output end of the third NAND gate is connected with the second input end of the first high-speed counter and the input end of the second high-speed timer.
5. The signal processing system for a magnetostrictive level meter according to claim 4, wherein the start of the second high speed timer is triggered after the pulse current generator generates a pulse current of 36 μs to filter out the interference generated by the pulse current, and the signal from the output of the third nand gate is used to down-regulate the edge to trigger the second high speed timer to stop timing.
6. The signal processing system for a magnetostrictive level meter according to claim 4, wherein the second signal generator is configured to generate a 1MHz square wave signal as a clock signal applied to the first high speed counter.
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| CN202320537916.5U CN219608164U (en) | 2023-03-20 | 2023-03-20 | Signal processing system for magnetostrictive level meter |
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