CN114323356B - Vibrating wire type sensor measuring instrument and measuring method thereof - Google Patents
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Abstract
The invention provides a vibrating wire type sensor measuring instrument and a measuring method thereof, which relate to the technical field of sensor detection.
Description
Technical Field
The invention relates to the technical field of sensor detection, in particular to a vibrating wire type sensor measuring instrument and a measuring method thereof.
Background
The sensitive element of the vibrating wire sensor is a wire, is commonly made of high-elasticity spring steel, marshall stainless steel or tungsten steel, is fixedly connected with a stress part of the sensor, and measures various physical quantities by utilizing the relation between the self-vibration frequency of the wire and the external tension applied to the wire. The vibrating wire sensor consists of vibrating wire, magnet, clamping device and stress mechanism. One end of the vibrating wire is fixed, and the other end is connected with the stress mechanism, and various vibrating wire sensors for measuring pressure, torque or acceleration and the like can be manufactured by utilizing different stress mechanisms. Because the structure precision requirement in the vibrating wire sensor is higher, a more accurate evaluation mode is required in the production process of the vibrating wire sensor; meanwhile, in the installation and use process of the vibrating wire sensor, a more accurate evaluation and debugging mode is also required. In the actual measuring process of the vibrating wire sensor, the measuring equipment and the method for waveform curve data of the vibrating wire sensor are lacked, so that the related process curve is difficult to accurately measure, and the measuring result of the vibrating wire sensor is lower in accuracy.
Disclosure of Invention
Therefore, the invention aims to provide a vibrating wire type sensor measuring instrument and a measuring method thereof, which can obtain the performance measuring result of the vibrating wire type sensor more accurately directly through waveform curve data contained in the measuring result, and solve the problems that the measuring result of the vibrating wire type sensor in the prior art is low in precision and related process curves are difficult to obtain.
In a first aspect, embodiments of the present invention provide a vibrating wire sensor measuring instrument, the circuit comprising: the electric energy injection circuit and the filtering amplifying circuit are respectively connected with the vibrating wire sensor, and the electric energy injection circuit and the filtering amplifying circuit also comprise a signal measuring circuit connected with the filtering amplifying circuit; the signal measuring circuit is also connected with the display screen;
Wherein the electric energy injection circuit comprises a power amplifier; the input end of the power amplifier is used for inputting an excitation signal required by the vibration wire type sensor during starting vibration, and the output end of the power amplifier is connected with the end pole of the vibration wire type sensor;
The end pole of the vibrating wire sensor is also connected with a filtering and amplifying circuit, and the filtering and amplifying circuit comprises a signal amplifier; the input end of the signal amplifier is connected with the end pole of the vibrating wire sensor, and the induced electromotive force generated by the vibrating wire sensor is input to the input end of the signal measuring circuit through the output end of the signal amplifier;
The signal measurement circuit includes: an analog-to-digital conversion circuit and a signal processing circuit; after the induced electromotive force generated by the vibrating wire sensor is input from the input end of the signal measuring circuit, data acquisition is performed through the analog-to-digital conversion circuit, and the acquired induced electromotive force is input to the signal processing circuit; the signal processing circuit determines a measurement result of the vibrating wire sensor according to the acquired induced electromotive force; the measuring result at least comprises frequency, temperature, modulus, induced voltage change curve, induced voltage spectrum curve and induced voltage decay curve data of the vibrating wire sensor;
the measurement result is displayed by a display screen connected with the output end of the signal measurement circuit.
In some embodiments, the power amplifier is a CS8508E power amplifier; the electric energy injection circuit further comprises a first resistor R33, a second resistor R34, a third resistor R21 and a fourth resistor R22 which are respectively connected with the power amplifier;
One end of the first resistor R33 is input with an enabling signal of an excitation signal, and the other end of the first resistor R33 is connected with a first pin of the power amplifier; one end of the second resistor R34 is input with a mode selection signal of an excitation signal, and the other end of the second resistor R34 is connected with a second pin of the power amplifier; one end of the third resistor R21 is input with a positive phase signal of an excitation signal, and the other end of the third resistor R21 is connected with a third pin of the power amplifier; one end of the fourth resistor R22 is input with an inverted signal of the excitation signal, and the other end of the fourth resistor R22 is connected with a fourth pin of the power amplifier; the fifth pin of the power amplifier is connected with a power supply; the sixth pin of the power amplifier is connected with the first end point of the end electrode; the seventh pin of the power amplifier is connected with the second end point of the end electrode; the eighth pin of the power amplifier is grounded.
In some embodiments, the first resistor R33 has a resistance of 510 ohms; the resistance value of the second resistor R34 is 510 ohms; the resistance value of the third resistor R21 is 62K ohms; the resistance of the fourth resistor R22 is 62K ohms.
In some embodiments, the reference voltage of the positive phase signal of the excitation signal is 1.65V; the supply voltage of the power supply is 8V.
In some embodiments, the signal amplifier in the filter amplification circuit is an 8-pin power amplifier;
the filter amplifying circuit further comprises a first resistor R4, a second resistor R14, a third resistor R79, a fourth resistor R47, a fifth resistor R40, a sixth resistor R78 and a seventh resistor R12; the capacitor also comprises a first capacitor C13, a second capacitor C10 and a third capacitor C2; the first diode D7 and the second diode D6 are also included;
The first end point of the end pole of the vibrating wire sensor is respectively connected with the first resistor R4, the fifth resistor R40, the third capacitor C2 and the second diode D6; the first resistor R4 is connected with the second resistor R14 and then connected with a second endpoint of an end pole of the vibrating wire sensor; the second end point of the end pole of the vibrating wire sensor is also connected with a first diode D7 and a fourth resistor R47 respectively; the first capacitor C13 is connected with the first diode D7 in parallel; the positive electrode of the first diode D7 is grounded and connected with a third pin of the signal amplifier through a third resistor R79; the fourth resistor R47 is connected with the second pin of the signal amplifier after passing through the second capacitor C10; the fourth resistor R47 is also connected with a third pin of the signal amplifier; the fifth resistor R40 is connected with the second pin of the signal amplifier; the third capacitor C2 is connected with the second pin of the signal amplifier through a sixth resistor R78; the anode of the second diode D6 is grounded and is respectively connected with a third capacitor C2 and a sixth resistor R78;
The fourth pin of the signal amplifier is grounded; a fifth pin of the signal amplifier inputs a reference voltage; the sixth pin of the signal amplifier is used as an output end of the signal amplifier and is input into the signal measuring circuit; the sixth pin of the signal amplifier is also grounded through a seventh resistor R12; the seventh pin of the signal amplifier is connected with a power supply.
In some embodiments, the first resistance R4 is 510K ohms; the resistance value of the second resistor R14 is 510 Kohm; the resistance value of the third resistor R79 is 510 Kohm; the resistance value of the fourth resistor R47 is 2.2K ohms; the resistance value of the fifth resistor R40 is 2.2 Kohm; the resistance value of the sixth resistor R78 is 510 Kohms; the resistance of the seventh resistor R12 is 11.0K ohms.
In some embodiments, the capacity of the first capacitor C13 is 270pF; the capacity of the second capacitor C10 is 100pF; the capacity of the third capacitor C2 is 270pF.
In some embodiments, the fifth pin input reference voltage of the signal amplifier is 1.65V; the voltage of the power supply connected with the seventh pin of the signal amplifier is 3.3V.
In some embodiments, the first diode D7 and the second diode D6 are CESD3V3D3 diodes.
In a second aspect, embodiments of the present invention provide a vibrating wire sensor measurement method, where the method is applied to the vibrating wire sensor measurement instrument mentioned in the first aspect; wherein, vibrating wire type sensor measuring instrument includes: the electric energy injection circuit and the filtering amplifying circuit are respectively connected with the vibrating wire type sensor, and the electric energy injection circuit and the filtering amplifying circuit also comprise a signal measuring circuit connected with the filtering amplifying circuit and a display screen connected with the signal measuring circuit; the method comprises the following steps:
inputting an excitation signal to the electric energy injection circuit; wherein the excitation signal comprises: sine waves, square waves, triangular waves, high voltage pulses, one or more of the above;
after the excitation signal is input, the induced electromotive force generated by the vibrating wire sensor is obtained;
The method comprises the steps of controlling the induced electromotive force to be input into a filtering and amplifying circuit, filtering and amplifying the induced electromotive force by the filtering and amplifying circuit, inputting the filtered wave into a signal measuring circuit, and obtaining a measuring result of a vibrating wire sensor through the signal measuring circuit; wherein, the measurement result comprises: an induced voltage variation curve, an induced voltage spectrum curve, an induced voltage decay curve, and one or more curve data described above;
and displaying the curve data by using a display screen.
The embodiment of the invention has the following beneficial effects:
The invention provides a vibrating wire type sensor measuring instrument and a measuring method thereof, wherein the measuring instrument comprises: the electric energy injection circuit and the filtering amplifying circuit are respectively connected with the vibrating wire sensor, and the electric energy injection circuit and the filtering amplifying circuit also comprise a signal measuring circuit connected with the filtering amplifying circuit; the signal measuring circuit is also connected with the display screen; wherein the electric energy injection circuit comprises a power amplifier; the input end of the power amplifier is input with an excitation signal, and the output end of the power amplifier is connected with the end pole of the vibrating wire sensor; the end pole of the vibrating wire sensor is also connected with a filtering and amplifying circuit, and the filtering and amplifying circuit comprises a signal amplifier; the input end of the signal amplifier is connected with the end pole of the vibrating wire sensor, and the induced electromotive force generated by the vibrating wire sensor is input to the input end of the signal measuring circuit through the output end of the signal amplifier; the signal measurement circuit includes: an analog-to-digital conversion circuit and a signal processing circuit; after the induced electromotive force generated by the vibrating wire sensor is input from the input end of the signal measuring circuit, data acquisition is performed through the analog-to-digital conversion circuit, and the acquired induced electromotive force is input to the signal processing circuit; the signal processing circuit determines a measurement result of the vibrating wire sensor according to the acquired induced electromotive force; the measuring result at least comprises frequency, temperature, modulus, induced voltage change curve, induced voltage spectrum curve and induced voltage decay curve data of the vibrating wire sensor; the measurement result is displayed by a display screen connected with the output end of the signal measurement circuit. In the process of measuring by using a vibrating wire type sensor measuring instrument, an excitation signal is input to an electric energy injection circuit; wherein the excitation signal comprises: sine waves, square waves, triangular waves, high voltage pulses, one or more of the above; after the excitation signal is input, obtaining the induced electromotive force generated by the vibrating wire sensor; then controlling the induced electromotive force to be input into a filtering and amplifying circuit, and inputting the filtered wave amplified induced electromotive force into a signal measuring circuit by the filtering and amplifying circuit; the measuring result of the vibrating wire type sensor is obtained through the signal measuring circuit; wherein, the measurement result comprises: an induced voltage variation curve, an induced voltage spectrum curve, an induced voltage decay curve, and one or more curve data described above; and finally, displaying the curve data by using a display screen. The measuring instrument and the measuring method thereof can obtain the performance measuring result of the vibrating wire type sensor more accurately by directly using the waveform curve data contained in the measuring result, and solve the problems that the measuring result of the vibrating wire type sensor in the prior art is low in precision and the related process curve is difficult to obtain.
Additional features and advantages of the invention will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a vibrating wire sensor measuring instrument according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of an electric energy injection circuit in a vibrating wire sensor measuring instrument according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a filtering amplifying circuit in a vibrating wire sensor measuring instrument according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a display effect generated by a vibrating wire sensor measuring instrument according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing a display effect generated by another vibrating wire sensor measuring instrument according to an embodiment of the present invention;
Fig. 6 is a flowchart of a measuring method of a vibrating wire sensor according to an embodiment of the present invention.
Icon:
100-an electric energy injection circuit; a 110-power amplifier; 200-vibrating wire sensor; 300-a filter amplifying circuit; 310-a signal amplifier; 400-a signal measurement circuit; 410-an analog-to-digital conversion circuit; 420-a signal processing circuit; 500-display screen.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The sensing element of the vibrating wire type sensor is a metal wire string, commonly called a steel string, a vibrating wire or simply a string, and is usually made of high-elasticity spring steel, marshall stainless steel or tungsten steel. The sensor is fixedly connected with a stress part of the sensor, and various physical quantities are measured by utilizing the relation between the natural vibration frequency of the steel wire and the external tension applied to the steel wire. The material and quality of the vibrating wire directly affect the accuracy, sensitivity and stability of the sensor. The tungsten filament has stable performance, high hardness, high melting point and high tensile strength, and is a common vibrating wire material. In addition, violin strings, high-strength steel wires, titanium wires and the like can be used as vibrating string materials. The vibrating wire sensor consists of vibrating wire, magnet, clamping device and stress mechanism. One end of the vibrating wire is fixed, and the other end is connected to the stress mechanism. Various vibrating wire type sensors for measuring pressure, torque or acceleration can be manufactured by utilizing different stress mechanisms.
Because the structure precision requirement in the vibrating wire sensor is higher, a more accurate evaluation mode is required in the production process of the vibrating wire sensor; meanwhile, in the installation and use process of the vibrating wire sensor, a more accurate evaluation and debugging mode is also required. In the aspect of performance measurement of the vibrating wire sensor, simpler measuring equipment and method are lacked in the prior art.
Therefore, the technical problems that the related process curve is difficult to accurately measure and the measurement result of the vibrating wire sensor has lower precision caused by the lack of related measurement equipment and method in the measurement process of the existing vibrating wire sensor are also existed.
Based on the above, the embodiment of the invention provides a vibrating wire type sensor measuring instrument and a measuring method thereof, which can obtain the performance measuring result of the vibrating wire type sensor more accurately directly through waveform curve data contained in the measuring result, and solve the problems that the measuring result of the vibrating wire type sensor in the prior art is low in precision and the related process curve is difficult to obtain.
For the convenience of understanding the present embodiment, a vibrating wire sensor measuring instrument disclosed in the embodiment of the present invention will be described in detail.
Referring to the schematic structural diagram of a vibrating wire sensor measuring instrument shown in fig. 1, the circuit comprises: the electric energy injection circuit 100 and the filter amplification circuit 300 which are respectively connected with the vibrating wire sensor 200 further comprise a signal measurement circuit 400 connected with the filter amplification circuit 300; the signal measurement circuit 400 is also connected to the display screen 500.
Wherein the power injection circuit 100 includes a power amplifier 110; the input end of the power amplifier 110 inputs an excitation signal required by the vibrating wire sensor during starting vibration, and the output end of the power amplifier 110 is connected with the end pole of the vibrating wire sensor 200; the excitation signal pushes the vibrating wire sensor 200 into an oscillation state so that the oscillation frequency generated by it can be measured.
The end pole of the vibrating wire sensor 200 is also connected with a filter amplifying circuit 300, and the filter amplifying circuit 300 comprises a signal amplifier 310; the input end of the signal amplifier 310 is connected to the end pole of the vibrating wire sensor 200, and the induced electromotive force generated by the vibrating wire sensor 200 is input to the input end of the signal measurement circuit 400 through the output end of the signal amplifier 310, so as to amplify and filter the micro induced voltage generated by the vibrating wire sensor 200.
The signal measurement circuit 400 includes: analog-to-digital conversion circuit 410 and signal processing circuit 420; after the induced electromotive force generated by the vibrating wire sensor 200 is input from the input end of the signal measurement circuit 400, the data is collected by the analog-to-digital conversion circuit 410, and the collected induced electromotive force is input to the signal processing circuit 420; the signal processing circuit 420 determines the measurement result of the vibrating wire sensor 200 according to the acquired induced electromotive force; the measurement result at least comprises frequency, temperature, modulus, induced voltage change curve, induced voltage spectrum curve and induced voltage decay curve data of the vibrating wire sensor. The measurement results are displayed by a display screen 500 connected to the output terminal of the signal measurement circuit 400.
Specifically, the electric energy injection circuit 100 inputs different excitation signals such as corresponding sine waves, square waves, triangular waves, high-voltage pulses and the like to enable the vibrating wire sensor 200 to generate corresponding vibration; then, the induced electromotive force generated by the vibrating wire sensor 200 in the vibration process is input into the filtering and amplifying circuit 300 for amplification, and then the measurement result of the vibrating wire sensor 200 is obtained after the processing of the analog-digital conversion circuit 410 and the signal processing circuit 420 in the signal measuring circuit 400. The measurement results may include: the induced electromotive force attenuation process, the voltage variation waveform, the spectrum curve, the vibration frequency and other related data can be displayed in the display screen 500 through corresponding waveforms, such as the induced voltage waveform of the vibrating wire sensor.
In an actual scene, after the vibrating wire sensor is excited by an excitation signal, the voltage change waveform of the vibrating wire sensor can be displayed, and at the moment, the vibrating wire sensor measuring instrument acts like an oscilloscope; after excitation by excitation signals, the vibrating wire sensor can also display the spectrum curve, and the vibrating wire sensor measuring instrument acts like a spectrum analyzer. The actual waveform of the vibrating wire sensor is used for further acquiring relevant frequency domain characteristics and attenuation characteristics of induced voltage, so that performance measurement data of the vibrating wire sensor are further acquired, and measurement result accuracy is improved.
The function of the power injection circuit 100 is to perform power injection, and the input excitation signal may be, but is not limited to, sine waves, square waves, triangular waves, and high voltage pulses, ultimately causing mechanical movement of the vibrating wire sensor. Specifically, a schematic structure of the power injection circuit 100 is shown in fig. 2. The power amplifier is a CS8508E power amplifier; the power injection circuit further includes a first resistor R33, a second resistor R34, a third resistor R21, and a fourth resistor R22 respectively connected to the power amplifier.
One end of the first resistor R33 is input with an enabling signal of an excitation signal, and the other end of the first resistor R33 is connected with a first pin of the power amplifier; one end of the second resistor R34 is input with a mode selection signal of an excitation signal, and the other end of the second resistor R34 is connected with a second pin of the power amplifier; one end of the third resistor R21 is input with a positive phase signal of an excitation signal, and the other end of the third resistor R21 is connected with a third pin of the power amplifier; one end of the fourth resistor R22 is input with an inverted signal of the excitation signal, and the other end of the fourth resistor R22 is connected with a fourth pin of the power amplifier; the fifth pin of the power amplifier is connected with a power supply; the sixth pin of the power amplifier is connected with the first end point of the end electrode; the seventh pin of the power amplifier is connected with the second end point of the end electrode; the eighth pin of the power amplifier is grounded.
The resistance value of the first resistor R33 is 510 ohms; the resistance value of the second resistor R34 is 510 ohms; the resistance value of the third resistor R21 is 62K ohms; the resistance of the fourth resistor R22 is 62K ohms. The reference voltage of the normal phase signal of the excitation signal is 1.65V; the supply voltage of the power supply is 8V.
The induced electromotive force generated by the vibrating wire sensor 200 is filtered and amplified by the filter amplifying circuit 300, and then is analog-digital converted and digital signal processed by the signal measuring circuit 400. As shown in fig. 3, the schematic structural diagram of the filter amplifying circuit 300 is that the signal amplifier in the filter amplifying circuit 300 is an 8-pin power amplifier; the filter amplifying circuit further comprises a first resistor R4, a second resistor R14, a third resistor R79, a fourth resistor R47, a fifth resistor R40, a sixth resistor R78 and a seventh resistor R12; the capacitor also comprises a first capacitor C13, a second capacitor C10 and a third capacitor C2; also included is a first diode D7 and a second diode D6.
The first end point of the end pole of the vibrating wire sensor corresponds to the end pole A of the vibrating wire sensor in FIG. 3, and is respectively connected with the first resistor R4, the fifth resistor R40, the third capacitor C2 and the second diode D6; the first resistor R4 is connected with the second resistor R14 and then connected with the second endpoint of the end pole of the vibrating wire sensor. Specifically, the second end corresponds to the vibrating wire sensor end pole B in fig. 3; the first diode D7 and the fourth resistor R47 are respectively connected with the first resistor; the first capacitor C13 is connected with the first diode D7 in parallel; the positive electrode of the first diode D7 is grounded and connected with a third pin of the signal amplifier through a third resistor R79; the fourth resistor R47 is connected with the second pin of the signal amplifier after passing through the second capacitor C10; the fourth resistor R47 is also connected with a third pin of the signal amplifier; the fifth resistor R40 is connected with the second pin of the signal amplifier; the third capacitor C2 is connected with the second pin of the signal amplifier through a sixth resistor R78; the positive electrode of the second diode D6 is grounded, and is connected to the third capacitor C2 and the sixth resistor R78, respectively.
The fourth pin of the signal amplifier is grounded; a fifth pin of the signal amplifier inputs a reference voltage; the sixth pin of the signal amplifier is used as an output end of the signal amplifier and is input into the signal measuring circuit; the sixth pin of the signal amplifier is also grounded through a seventh resistor R12; the seventh pin of the signal amplifier is connected with a power supply.
The first resistor R4 is 510K ohms; the resistance value of the second resistor R14 is 510 Kohm; the resistance value of the third resistor R79 is 510 Kohm; the resistance value of the fourth resistor R47 is 2.2K ohms; the resistance value of the fifth resistor R40 is 2.2 Kohm; the resistance value of the sixth resistor R78 is 510 Kohms; the resistance of the seventh resistor R12 is 11.0K ohms.
The capacity of the first capacitor C13 is 270pF; the capacity of the second capacitor C10 is 100pF; the capacity of the third capacitor C2 is 270pF.
The reference voltage input by the fifth pin of the signal amplifier is 1.65V; the voltage of the power supply connected with the seventh pin of the signal amplifier is 3.3V.
A first diode D7 and a second diode D6, which are CESD3V3D3 diodes.
It follows that the vibrating wire sensor measuring instrument can realize the following functions:
a. exciting the vibrating wire sensor;
b. Displaying the frequency value after excitation of the vibrating wire sensor;
c. displaying the modulus of the frequency value after excitation of the vibrating wire sensor;
d. displaying the resistance of the vibrating wire sensor;
e. displaying the resistance value and the corresponding temperature value of a thermocouple arranged in the vibrating wire sensor;
f. displaying the voltage variation waveform of the vibrating wire sensor after excitation;
g. Displaying a spectrum curve after excitation of the vibrating wire sensor;
h. and displaying the attenuation process of the induced electromotive force after the vibrating wire sensor is excited.
Therefore, the induced electromotive force generated by the string sensor can finally obtain related data such as an induced electromotive force attenuation process, a voltage change waveform, a frequency spectrum curve, vibration frequency and the like through filtering amplification, analog-to-digital conversion and digital signal processing, and the data can be displayed through corresponding waveforms which can be displayed, stored and transmitted through corresponding waveform acquisition equipment. The display effect is shown in fig. 4 and 5, and the vibration wire sensor induced voltage attenuation curve is shown in the display screen 500 in fig. 4; shown in display 500 in fig. 5 are the induced voltage profile of the vibrating wire sensor and the induced voltage spectrum profile.
After the waveform curve is obtained, the measurement performance of the vibrating wire sensor can be more accurately determined by observing and analyzing the curve, for example, the amplitude of a voltage change curve is narrowed, and the situation that a half short circuit state occurs in an intermediate cable is likely; the spectrum curve has a plurality of wave peaks, which indicates that other interference is mixed in the cable transmission; if the attenuation curve is too fast, the sensor is poorly manufactured.
According to the vibrating wire type sensor measuring instrument provided by the embodiment, the exciting signal can be amplified through the electric energy injection circuit, the induced electromotive force is generated after the vibrating wire type sensor is excited, and the induced electromotive force is subjected to analog-to-digital conversion and signal processing, so that a measuring result is finally obtained. The waveform curve data contained in the measurement result can be used for more accurately obtaining the performance measurement result of the vibrating wire sensor, and the problem that the measurement result accuracy of the vibrating wire sensor in the prior art is low is solved.
The embodiment of the invention also provides a measuring method of the vibrating wire sensor, which is applied to the measuring instrument of the vibrating wire sensor mentioned in the embodiment; wherein, this vibrating wire type sensor measuring instrument includes: the electric energy injection circuit and the filtering amplifying circuit are respectively connected with the vibrating wire sensor, and the electric energy injection circuit and the filtering amplifying circuit also comprise a signal measuring circuit connected with the filtering amplifying circuit; specifically, as shown in fig. 6, the method includes:
Step S601, inputting an excitation signal to an electric energy injection circuit; wherein the excitation signal comprises: sine waves, square waves, triangular waves, high voltage pulses, or any combination thereof.
The excitation signal is injected through the electric energy injection circuit, amplified through a power amplifier arranged in the electric energy injection circuit, and finally transmitted to the excitation vibrating wire sensor.
Step S602, after the excitation signal is input, the induced electromotive force generated by the vibrating wire sensor is obtained.
After the excitation signal is input to the vibrating wire sensor, the vibrating wire sensor generates vibration, so that corresponding induced electromotive force is generated, and the induced electromotive force contains various measurement indexes of the vibrating wire sensor and needs to be analyzed and measured through subsequent steps.
Step S603, controlling the induced electromotive force to be input into a filtering and amplifying circuit, and inputting the filtered wave amplified induced electromotive force into a signal measuring circuit by the filtering and amplifying circuit, and obtaining a measuring result of the vibrating wire sensor through the signal measuring circuit; wherein, the measurement result comprises: an induced voltage profile, an induced voltage spectrum profile, an induced voltage decay profile, and one or more of the profile data described above.
After the induced electromotive force is obtained, the induced electromotive force is controlled to be input into a filtering and amplifying circuit for filtering and amplifying, and after the filtering and amplifying is finished, a signal output by the filtering and amplifying circuit is input into a signal measuring circuit for analysis.
Step S604, displaying curve data by using a display screen.
In the process, the vibrating wire sensor is excited to generate induced electromotive force, and then analog-to-digital conversion and signal processing are carried out, so that relevant data such as an induced electromotive force attenuation process, a voltage change waveform, a frequency spectrum curve and vibration frequency are finally obtained. The waveform curve data contained in the measurement result can be used for more accurately obtaining the performance measurement result of the vibrating wire sensor, and the problem that the measurement result accuracy of the vibrating wire sensor in the prior art is low is solved. In an actual scene, the method can help a vibrating wire type sensor manufacturer to better evaluate the quality of the produced sensor; the vibration wire type sensor can also be better installed by an installation operator; meanwhile, the working state of the vibrating wire sensor can be accurately estimated by a supervisor.
The vibrating wire type sensor measuring method provided by the embodiment of the invention has the same technical characteristics as the vibrating wire type sensor measuring instrument provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved. For a brief description, reference may be made to the corresponding content of the previous embodiments where the embodiments are not mentioned.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, indirect coupling or communication connection of devices or units, electrical, mechanical, or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A vibrating wire sensor measuring instrument, the measuring instrument comprising: the electric energy injection circuit and the filtering amplifying circuit are respectively connected with the vibrating wire sensor, and the electric energy injection circuit and the filtering amplifying circuit also comprise a signal measuring circuit connected with the filtering amplifying circuit; the signal measuring circuit is also connected with the display screen;
Wherein the electric energy injection circuit comprises a power amplifier; the input end of the power amplifier inputs an excitation signal required by the vibrating wire sensor during starting vibration, and the output end of the power amplifier is connected with the end pole of the vibrating wire sensor;
the end pole of the vibrating wire sensor is also connected with the filtering and amplifying circuit, and the filtering and amplifying circuit comprises a signal amplifier; the input end of the signal amplifier is connected with the end pole of the vibrating wire sensor, and the induced electromotive force generated by the vibrating wire sensor is input to the input end of the signal measuring circuit through the output end of the signal amplifier;
The signal measuring circuit comprises: an analog-to-digital conversion circuit and a signal processing circuit; after the induced electromotive force generated by the vibrating wire sensor is input from the input end of the signal measuring circuit, data acquisition is performed through the analog-to-digital conversion circuit, and the acquired induced electromotive force is input to the signal processing circuit; the signal processing circuit determines a measurement result of the vibrating wire sensor according to the acquired induced electromotive force; the measuring result at least comprises frequency, temperature, modulus, induced voltage change curve, induced voltage spectrum curve and induced voltage decay curve data of the vibrating wire sensor;
The measurement result is displayed through the display screen connected with the output end of the signal measurement circuit;
the signal amplifier in the filter amplifying circuit is an 8-pin power amplifier;
The filter amplification circuit further comprises a first resistor R4, a second resistor R14, a third resistor R79, a fourth resistor R47, a fifth resistor R40, a sixth resistor R78 and a seventh resistor R12; the capacitor also comprises a first capacitor C13, a second capacitor C10 and a third capacitor C2; the first diode D7 and the second diode D6 are also included;
The first end point of the end pole of the vibrating wire sensor is respectively connected with the first resistor R4, the fifth resistor R40, the third capacitor C2 and the second diode D6; the first resistor R4 is connected with the second resistor R14 and then connected with a second end point of an end pole of the vibrating wire sensor; the second end point of the end pole of the vibrating wire sensor is also connected with the first diode D7 and the fourth resistor R47 respectively; the first capacitor C13 is connected with the first diode D7 in parallel; the positive electrode of the first diode D7 is grounded and connected with a third pin of the signal amplifier after passing through the third resistor R79; the fourth resistor R47 is connected with the second pin of the signal amplifier after passing through the second capacitor C10; the fourth resistor R47 is also connected with a third pin of the signal amplifier; the fifth resistor R40 is connected with the second pin of the signal amplifier; the third capacitor C2 is connected with the second pin of the signal amplifier through the sixth resistor R78; the anode of the second diode D6 is grounded and is respectively connected with the third capacitor C2 and the sixth resistor R78;
The fourth pin of the signal amplifier is grounded; a fifth pin of the signal amplifier inputs a reference voltage; the sixth pin of the signal amplifier is used as the output end of the signal amplifier to be input into the signal measuring circuit; the sixth pin of the signal amplifier is also grounded through the seventh resistor R12; and a seventh pin of the signal amplifier is connected with a power supply.
2. A vibrating wire sensor measurement method, characterized in that the method is applied to the vibrating wire sensor measuring instrument described in the above claim 1; wherein, vibrating wire sensor measuring instrument includes: the device comprises an electric energy injection circuit, a filtering amplifying circuit, a signal measuring circuit and a display screen, wherein the electric energy injection circuit and the filtering amplifying circuit are respectively connected with a vibrating wire sensor; the method comprises the following steps:
Inputting an excitation signal to the electric energy injection circuit; wherein the excitation signal comprises: sine waves, square waves, triangular waves, high voltage pulses, one or more of the above;
after the excitation signal is input, the induced electromotive force generated by the vibrating wire sensor is obtained;
The induced electromotive force is controlled to be input into the filtering and amplifying circuit, the filtering and amplifying circuit amplifies the induced electromotive force in a filtering way and then inputs the amplified induced electromotive force into the signal measuring circuit, and the measuring result of the vibrating wire sensor is obtained through the signal measuring circuit; wherein, the measurement result comprises: an induced voltage variation curve, an induced voltage spectrum curve, an induced voltage decay curve, and one or more curve data described above;
and displaying the curve data by using the display screen.
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| JP2007071681A (en) * | 2005-09-07 | 2007-03-22 | Ngk Spark Plug Co Ltd | Signal processor and physical quantity detecting device |
| CN201909669U (en) * | 2010-12-28 | 2011-07-27 | 基康仪器(北京)有限公司 | Frequency measurement system of unicoil vibrating wire instrument |
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