CN110579229A - Piezomagnetic sensor detection system based on frequency sweep detection - Google Patents
Piezomagnetic sensor detection system based on frequency sweep detection Download PDFInfo
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- CN110579229A CN110579229A CN201910624376.2A CN201910624376A CN110579229A CN 110579229 A CN110579229 A CN 110579229A CN 201910624376 A CN201910624376 A CN 201910624376A CN 110579229 A CN110579229 A CN 110579229A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a piezomagnetic sensor detection system based on sweep frequency detection, which comprises a control processing unit, a storage unit, a display unit, a communication unit, an excitation signal generation unit, a first signal conditioning unit, an excitation coil, a response signal acquisition unit, a second signal conditioning unit, an A/D conversion unit and an upper computer, wherein the control processing unit is used for controlling the control processing unit to perform frequency conversion; the piezomagnetic sensor detection system controls the excitation signal generation unit to generate an excitation signal through the control processing unit, applies the excitation signal to the sensor through the excitation coil, and acquires a resonance signal of the sensor through the response signal acquisition unit. The invention provides a piezomagnetic sensor detection system based on frequency sweep detection, which can realize the detection of a resonance frequency point by detecting an induced amplitude signal in a detection coil by adopting a frequency sweep method, thereby realizing the detection of a detected object.
Description
Technical Field
The invention belongs to the technical field of power equipment detection, and particularly relates to a piezomagnetic sensor detection system based on frequency sweep detection.
Background
The piezomagnetic sensor is a novel sensor designed by using the inverse magnetostriction effect as a detection basis and realizing the measurement of a measured object by detecting the resonance frequency or the resonance amplitude of the sensor. The piezomagnetic sensor has the characteristics of small volume, low cost, low energy consumption and the like, is widely applied to the technical fields of physical, biological, chemical, biomedical engineering and the like, and is applied to the measurement of stress, mass load, liquid density, flow rate, viscosity, temperature and the like based on the magnetoelastic physical sensor.
Most piezomagnetic sensor detection systems at present need to be built by means of large excitation equipment and detection equipment in a combined mode, and have the defects of high cost, high power consumption, poor portability and the like. The invention provides a piezomagnetic sensor detection system based on sweep frequency detection, which applies an alternating current excitation signal to a piezomagnetic sensor, and when the piezomagnetic sensor vibrates due to the magnetostrictive effect and reaches a resonance frequency point, the amplitude of the vibration is maximum, and the peak value detected by a detection coil is also maximum. The detection of the resonance frequency point can be realized by detecting the induced amplitude signal in the detection coil, thereby realizing the detection of the detected object.
Disclosure of Invention
The invention provides a piezomagnetic sensor detection system based on frequency sweep detection, which can realize the detection of a resonance frequency point by detecting an induced amplitude signal in a detection coil by adopting a frequency sweep method, thereby realizing the detection of a detected object.
The invention particularly relates to a piezomagnetic sensor detection system based on sweep frequency detection, which comprises a control processing unit, a storage unit, a display unit, a communication unit, an excitation signal generation unit, a first signal conditioning unit, an excitation coil, a response signal acquisition unit, a second signal conditioning unit, an A/D conversion unit and an upper computer, wherein the control processing unit is respectively connected with the storage unit, the display unit, the communication unit, the excitation signal generation unit and the A/D conversion unit, the excitation signal generation unit is also sequentially connected with the first signal conditioning unit and the excitation coil, the A/D conversion unit is also sequentially connected with the second signal conditioning unit and the response signal acquisition unit, and the excitation coil and the response signal acquisition unit are respectively connected with the sensor in an induction manner, the communication unit is also connected with the upper computer; the piezomagnetic sensor detection system controls the excitation signal generation unit to generate an excitation signal through the control processing unit, applies the excitation signal to the sensor through the excitation coil, and acquires a resonance signal of the sensor through the response signal acquisition unit.
The piezomagnetic sensor detection system adopts a mode of jointly supplying power by a rechargeable battery and a power adapter, the power adapter converts a 220V power supply into 12V direct current for output, and the 12V direct current is conditioned by a voltage conditioning circuit to output 3.3V and 5V voltages.
The control processing unit adopts an STM32F103zet6 microprocessor to control the excitation signal generating unit to generate sine wave signals, and analyzes the resonance signals acquired by the response signal acquiring unit.
The display unit adopts a liquid crystal display.
The communication unit adopts a GPRS wireless communication technology to transmit information with the upper computer: and receiving a control instruction of the upper computer, and uploading detection data of the piezomagnetic sensor detection system to the upper computer.
The excitation signal generating unit comprises a phase accumulator, a phase amplitude converter and a D/A converter, wherein the phase accumulator adopts an AD9850 chip to continuously increase frequency control words to obtain a phase value corresponding to the sine wave signal; the phase amplitude converter obtains the amplitude of a binary digital signal by looking up the phase value of the sine wave signal in a table look-up mode; and the D/A converter converts the digital signal into the sine wave signal and outputs the sine wave signal.
The first signal conditioning unit filters high-frequency interference signals in the sine wave signals by adopting an active low-pass filter.
The response signal acquisition unit acquires the resonance signal of the piezomagnetic sensor by adopting an induction coil.
The second signal conditioning unit filters and amplifies the resonance signal, and the resonance signal is converted by the A/D conversion unit and then input to the control processing unit for analysis.
Drawings
Fig. 1 is a schematic structural diagram of a piezomagnetic sensor detection system based on frequency sweep detection according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of a piezo-magnetic sensor detection system based on frequency sweep detection according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the sensor detection system of the present invention includes a control processing unit, a storage unit, a display unit, a communication unit, an excitation signal generating unit, a first signal conditioning unit, an excitation coil, a response signal acquiring unit, a second signal conditioning unit, an a/D converting unit, and an upper computer, wherein the control processing unit is respectively connected to the storage unit, the display unit, the communication unit, the excitation signal generating unit, and the a/D converting unit, the excitation signal generating unit is further sequentially connected to the first signal conditioning unit and the excitation coil, the a/D converting unit is further sequentially connected to the second signal conditioning unit and the response signal acquiring unit, the excitation coil and the response signal acquiring unit are respectively connected to the sensor by induction, the communication unit is also connected with the upper computer; the sensor detection system controls the excitation signal generation unit to generate an excitation signal through the control processing unit, the excitation signal is applied to the sensor through the excitation coil, and then the resonance signal of the sensor is acquired through the response signal acquisition unit.
The sensor detection system adopts a mode of jointly supplying power by using a rechargeable battery and a power adapter, the power adapter converts a 220V power supply into 12V direct current for output, and the 12V direct current is conditioned by a voltage conditioning circuit to output 3.3V and 5V voltages.
The control processing unit adopts an STM32F103zet6 microprocessor to control the excitation signal generating unit to generate sine wave signals, and analyzes the resonance signals acquired by the response signal acquiring unit.
The display unit adopts a liquid crystal display.
The communication unit adopts a GPRS wireless communication technology to transmit information with the upper computer: and receiving a control instruction of the upper computer, and uploading detection data of the sensor detection system to the upper computer.
The excitation signal generating unit comprises a phase accumulator, a phase amplitude converter and a D/A converter, wherein the phase accumulator adopts an AD9850 chip to continuously increase frequency control words to obtain a phase value corresponding to the sine wave signal; the phase amplitude converter obtains the amplitude of a binary digital signal by looking up the phase value of the sine wave signal in a table look-up mode; and the D/A converter converts the digital signal into the sine wave signal and outputs the sine wave signal.
The first signal conditioning unit filters high-frequency interference signals in the sine wave signals by adopting an active low-pass filter.
The response signal acquisition unit acquires the resonance signal of the sensor by using an induction coil.
The second signal conditioning unit filters and amplifies the resonance signal, and the resonance signal is converted by the A/D conversion unit and then input to the control processing unit for analysis.
The exciting coil applies an alternating voltage to vibrate the sensor, and the detecting coil induces the vibration of the sensor to generate an induced voltage.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A piezomagnetic sensor detection system based on sweep frequency detection is characterized by comprising a control processing unit, a storage unit, a display unit, a communication unit, an excitation signal generation unit, a first signal conditioning unit, an excitation coil, a response signal acquisition unit, a second signal conditioning unit, an A/D conversion unit and an upper computer, wherein the control processing unit is respectively connected with the storage unit, the display unit, the communication unit, the excitation signal generation unit and the A/D conversion unit, the excitation signal generation unit is also sequentially connected with the first signal conditioning unit and the excitation coil, the A/D conversion unit is also sequentially connected with the second signal conditioning unit and the response signal acquisition unit, and the excitation coil, the excitation coil and the upper computer are sequentially connected, The response signal acquisition unit is respectively connected with the sensors in an induction manner, and the communication unit is also connected with the upper computer; the piezomagnetic sensor detection system controls the excitation signal generation unit to generate an excitation signal through the control processing unit, applies the excitation signal to the sensor through the excitation coil, and acquires a resonance signal of the piezomagnetic sensor through the response signal acquisition unit.
2. A swept frequency detection-based piezomagnetic sensor detection system as claimed in claim 1, wherein the piezomagnetic sensor detection system adopts a mode of common power supply of a rechargeable battery and a power adapter, and the power adapter converts a 220V power supply into 12V direct current output, and then the 12V direct current output is conditioned by a voltage conditioning circuit to output 3.3V and 5V voltages.
3. A swept frequency detection-based piezomagnetic sensor detection system according to claim 2, wherein the control processing unit adopts an STM32F103zet6 microprocessor to control the excitation signal generation unit to generate sine wave signals, and analyzes the resonance signals collected by the response signal collection unit.
4. A swept frequency detection-based piezomagnetic sensor detection system according to claim 3, wherein the display unit employs a liquid crystal display.
5. A swept frequency detection-based piezomagnetic sensor detection system as claimed in claim 4, wherein the communication unit adopts GPRS wireless communication technology to perform information transmission with the upper computer: and receiving a control instruction of the upper computer, and uploading detection data of the piezomagnetic sensor detection system to the upper computer.
6. A swept frequency detection-based piezomagnetic sensor detection system according to claim 5, wherein the excitation signal generation unit comprises a phase accumulator, a phase amplitude converter and a D/A converter, the phase accumulator adopts an AD9850 chip to continuously increase frequency control words to obtain a phase value corresponding to the sine wave signal; the phase amplitude converter obtains the amplitude of a binary digital signal by looking up the phase value of the sine wave signal in a table look-up mode; and the D/A converter converts the digital signal into the sine wave signal and outputs the sine wave signal.
7. A swept frequency detection-based piezomagnetic sensor detection system according to claim 6, wherein the first signal conditioning unit employs an active low-pass filter to filter out high-frequency interference signals in the sine wave signal.
8. A swept frequency detection-based piezomagnetic sensor detection system according to claim 7, wherein the response signal acquisition unit adopts an induction coil to acquire the resonance signal of the piezomagnetic sensor.
9. A swept-frequency-detection-based piezomagnetic sensor detection system according to claim 8, wherein the second signal conditioning unit filters and amplifies the resonance signal, and the resonance signal is converted by the A/D conversion unit and then input to the control processing unit for analysis.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114705357A (en) * | 2022-04-19 | 2022-07-05 | 上海工业自动化仪表研究院有限公司 | Phase-sensitive demodulation correction method for magnetoelastic sensor |
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| CN101231314A (en) * | 2008-02-21 | 2008-07-30 | 湖南大学 | Method and apparatus for testing magnetosensor resonant frequency elasticity |
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| US20080071487A1 (en) * | 2006-03-31 | 2008-03-20 | Kmg2 Sensors Corporation | Impedance analysis technique for frequency domain characterization of magnetoelastic sensor element by measuring steady-state vibration of element while undergoing constant sine-wave excitation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705357A (en) * | 2022-04-19 | 2022-07-05 | 上海工业自动化仪表研究院有限公司 | Phase-sensitive demodulation correction method for magnetoelastic sensor |
| CN114705357B (en) * | 2022-04-19 | 2024-03-26 | 上海工业自动化仪表研究院有限公司 | Phase-sensitive demodulation correction method for magnetoelastic sensor |
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Application publication date: 20191217 |