CN114440936A - Signal acquisition circuit of vibrating wire type sensor - Google Patents
Signal acquisition circuit of vibrating wire type sensor Download PDFInfo
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- CN114440936A CN114440936A CN202111632208.1A CN202111632208A CN114440936A CN 114440936 A CN114440936 A CN 114440936A CN 202111632208 A CN202111632208 A CN 202111632208A CN 114440936 A CN114440936 A CN 114440936A
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- 238000005259 measurement Methods 0.000 abstract description 15
- 238000012544 monitoring process Methods 0.000 abstract description 7
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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
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
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Abstract
The invention provides a vibrating wire sensor signal acquisition circuit, which relates to the technical field of data monitoring and comprises a vibrating wire sensor, an excitation module, a signal amplification module, a vibration pickup module and a microprocessor, wherein the vibrating wire sensor is respectively connected with the excitation module and the signal amplification module; the excitation module is connected with the microprocessor and the microprocessor controls the output of the excitation pulse. The signal amplification module is connected with the vibration pickup module, and the vibration pickup module is connected with the microprocessor towards the rear end; the output of the vibrating wire sensor signal is collected through the processing of the signal amplification module and the vibration pickup module. The invention can improve the measurement precision and ensure the reliability of the signal of the vibrating wire sensor.
Description
Technical Field
The invention relates to a signal acquisition circuit of a vibrating wire type sensor, and belongs to the technical field of data monitoring.
Background
With the development of the technology, the trend of large-scale and complex building is more and more obvious, and in order to ensure the rapid development of infrastructure construction and ensure the safe production, the safety monitoring technology in the engineering field needs to be continuously improved and perfected. At present, a vibrating wire sensor is mainly applied to monitoring relevant data of pressure, stress, osmotic pressure, settlement, tension and the like which are related to system safety in engineering. In the known technology in the art, the main parameters acquired by the vibrating wire sensor signal are a resistance signal and a frequency signal, and a certain algorithm is executed through the resistance signal and the frequency signal to calculate relevant data related to system safety, such as pressure, stress, osmotic pressure, sedimentation, tension and the like.
The vibrating wire sensor is a non-electric quantity electric measuring sensor which is generally regarded and widely applied at home and abroad at present. The vibrating wire sensor directly outputs the self-vibration frequency signal of the vibrating wire, so the vibrating wire sensor has the characteristics of strong anti-interference capability, small influence of electrical parameters, small zero drift, small influence of temperature, stable and reliable performance, vibration resistance, long service life and the like. Vibrating wire sensors have been widely used in long-term monitoring projects for engineering and scientific research. The vibrating wire collecting equipment mainly comprises an exciting circuit, a signal amplifying circuit, a vibration pickup circuit, data processing and the like. In the monitoring process, a large amount of noise exists in frequency data, filtering is performed by adopting a conventional method, and data jitter exists, so that data accuracy is influenced.
Disclosure of Invention
Aiming at the defects of the frequency measurement mode of the existing vibrating wire sensor, the invention provides the frequency measurement method of the vibrating wire sensor, which greatly improves the measurement precision, the measurement efficiency and the measurement stability and simultaneously reduces the loss of the sensor.
A frequency acquisition circuit method of a vibrating wire sensor comprises the vibrating wire sensor, an excitation module, a signal amplification module, a vibration pickup module and a microprocessor, wherein the vibrating wire sensor is respectively connected with the excitation module and the signal amplification module; the excitation module is connected with the microprocessor, and the microprocessor controls the output of the excitation pulse signal; the signal amplification module is connected with the vibration pickup module, and the vibration pickup module is also connected with the microprocessor; and the output of the vibrating wire sensor signal is collected through the processing of the signal amplification module and the vibration pickup module.
Further, the excitation module provides pulse signals required by the vibrating wire sensor, and the output power is enhanced through the Darlington tube.
Further, the excitation pulse signal is generated by the microcontroller outputting PWM.
Furthermore, the signal amplification module amplifies a self-vibration electric signal generated by the vibrating wire sensor through a band-pass filter and a multistage operational amplifier.
Furthermore, the resistor used by the signal amplification module is a precision resistor, and the error range of the precision resistor is 0.1% +/-0.01%.
Further, the vibration pickup module stably outputs the detectable signal output by the signal amplification module to the microprocessor for processing through the comparator.
Furthermore, a band-pass filter matched with the multistage operational amplifiers is arranged in the signal amplification module, and the band-pass filter is arranged between the operational amplifiers at each stage in an interval mode.
Drawings
FIG. 1 is a schematic diagram of the overall connection of a vibrating wire sensor signal acquisition circuit according to the present invention.
FIG. 2 is a schematic diagram of the interior of an excitation module in a signal acquisition circuit of a vibrating wire sensor according to the present invention.
Fig. 3 is a schematic diagram of the interior of a signal amplification module in the signal acquisition circuit of the vibrating wire sensor according to the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
The invention provides a signal acquisition circuit of a vibrating wire sensor, so that frequency data of the vibrating wire sensor are acquired.
Example one
Referring to fig. 1-3, a signal collecting circuit of a vibrating wire sensor according to a first embodiment of the present invention includes a vibrating wire sensor, an excitation module, a signal amplification module, a vibration pickup module, and a microprocessor; the excitation module is connected with the microprocessor and the microprocessor controls the output of the excitation pulse; the signal amplification module is connected with the vibration pickup module, and the vibration pickup module is connected with the microprocessor; and the output of the vibrating wire sensor signal is collected through the processing of the signal amplification module and the vibration pickup module.
The microprocessor can be a single chip Microcomputer (MCU), a Digital Signal Processor (DSP), a Complex Programmable Logic Device (CPLD) or a Field Programmable Gate Array (FPGA). The PWM is controlled and output by a microprocessor, an exciting coil of the vibrating wire sensor is driven by an exciting module, when the frequency output by the microprocessor is close to the natural frequency of the exciting coil, the exciting coil can generate self-vibration, and the signal output by the self-vibration of the exciting coil passes through a band-pass filter and a multistage operational amplifier in a signal amplifying module, filters and amplifies the frequency output by the exciting coil and then passes through a vibration pickup circuit to change the output signal into a signal which can be processed by the microprocessor; and calculating a frequency signal of an exciting coil of the vibrating wire type sensor according to the data level signal.
In the vibrating wire sensor signal acquisition circuit and the method for acquiring a signal through the acquired signal, the comparator is preferably a high-speed comparator, which can shorten the voltage rise time, ensure the subsequent digital level signal, and acquire a more accurate pulse time, thereby improving the measurement efficiency. The high speed comparator can obtain accurate pulse waveform, thereby obtaining accurate frequency data.
In the first embodiment, the frequency range of the bandpass filter may be preset according to the operating frequency of the exciting coil of the vibrating wire sensor. The vibration frequency of the exciting coil of the vibrating wire type sensor is generally between 400Hz and 6000 Hz.
The signal acquisition circuit of the vibrating wire sensor provided by the embodiment can measure the frequency value of the exciting coil of the vibrating wire sensor, and load the amplitude values of the useful signal and the noise signal of the exciting coil to the nonlinear amplification area of the operational amplifier, so as to prevent the measurement error caused by the signal loss of the low-noise operational amplifier, thereby improving the measurement accuracy of the exciting coil for the first time. The low-frequency noise signal and the high-frequency noise signal which possibly exists in the noise signal are filtered by the band-pass filter, so that the measurement accuracy of the exciting coil is improved for the second time. In the embodiment, the noise signal is processed for many times in the process of measuring the frequency of the pair of excitation coils, so that the measurement precision of the frequency is improved.
According to the invention, the related data of pressure, stress, osmotic pressure, sedimentation, tension and the like in the engineering field and the like of the vibrating wire type sensor to be measured, which are related to system safety, can be obtained by measuring the frequency value of the exciting coil of the vibrating wire type sensor, so that the safety monitoring is carried out on the area to be measured.
The invention optimally designs the modes of the resistance measuring circuit and the frequency measuring circuit based on low power consumption and starting from improving the measuring precision.
The embodiment of the invention has the characteristics of simple implementation, high precision, low power consumption and low cost. The method is mainly realized from two aspects of analog signal acquisition technology and analog signal processing technology, and only electronic components commonly used in the market are needed to be adopted, so that the purposes of low power consumption and high-precision measurement can be realized, and meanwhile, the stability of the later stage of the product and the use period of the product are ensured. Compared with the traditional voltage measuring circuit, the resistance measuring circuit has the advantage that the error is kept constant in the whole measuring interval, the measuring range and the measuring precision can be adjusted by adjusting the resistance value of the high-precision resistor, so that the balance between power consumption and precision is achieved, and in vibrating wire collecting equipment such as a vibrating wire sensor and the like, the measuring precision requirement can be met and the aim of low power consumption can be fulfilled only by arranging a common dry battery. In addition, compared with the traditional frequency measurement circuit, the frequency measurement circuit has the advantages that the circuit can be simplified, the circuit stability is improved, the frequency measurement precision is improved, the power consumption is lower, the power can be supplied by a common battery, a large amount of complex calculation is not needed, the frequency measurement speed is high, and the real-time long-time detection can be realized.
The present embodiment is not limited to the first embodiment, and various changes made within the spirit and scope of the present invention are within the scope of the first embodiment.
Claims (7)
1. The utility model provides a vibrating wire formula sensor signal acquisition circuit which characterized in that: the vibration wire sensor is respectively connected with the excitation module and the signal amplification module; the excitation module is connected with the microprocessor, and the microprocessor controls the output of the excitation pulse signal; the signal amplification module is connected with the vibration pickup module, and the vibration pickup module is also connected with the microprocessor; and the output of the vibrating wire sensor signal is collected through the processing of the signal amplification module and the vibration pickup module.
2. The vibrating wire sensor signal acquisition circuit of claim 1, wherein: the excitation module provides pulse signals required by the vibrating wire sensor and enhances the output power through the Darlington tube.
3. The vibrating wire sensor signal acquisition circuit of claim 2, wherein: the excitation pulse signal is generated by the microcontroller output PWM.
4. The vibrating wire sensor signal acquisition circuit of claim 1, wherein: and the signal amplification module amplifies the self-vibration electric signal generated by the vibrating wire sensor through a band-pass filter and a multistage operational amplifier.
5. The vibrating wire sensor signal acquisition circuit of claim 1, wherein: the resistance device used by the signal amplification module is a precision resistor, and the error range of the precision resistor is 0.1% +/-0.01%.
6. The vibrating wire sensor signal acquisition circuit of claim 1, wherein: the vibration pickup module stably outputs the detectable signal output by the signal amplification module to the microprocessor for processing through the comparator.
7. The vibrating wire sensor signal acquisition circuit of claim 4, wherein: and a band-pass filter matched with the multistage operational amplifiers is arranged in the signal amplification module, and the band-pass filters are arranged between the operational amplifiers at each stage at intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111632208.1A CN114440936A (en) | 2021-12-28 | 2021-12-28 | Signal acquisition circuit of vibrating wire type sensor |
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| CN202111632208.1A CN114440936A (en) | 2021-12-28 | 2021-12-28 | Signal acquisition circuit of vibrating wire type sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115452203A (en) * | 2022-11-08 | 2022-12-09 | 常州金土木工程仪器有限公司 | Dynamic measuring circuit of vibrating wire sensor |
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|---|---|---|---|---|
| CN101936754A (en) * | 2010-09-01 | 2011-01-05 | 南京卡尔胜水电科技有限公司 | On-line self-correcting method of measuring data of dam safety monitoring automated data acquisition device |
| CN204302725U (en) * | 2014-12-18 | 2015-04-29 | 交通运输部天津水运工程科学研究所 | A kind of multi-sensor data collection and real time remote conveyer |
| CN205027378U (en) * | 2015-09-29 | 2016-02-10 | 南京南瑞集团公司 | Multichannel vibration wire formula sensor data collection module |
| CN106289034A (en) * | 2016-08-01 | 2017-01-04 | 长安大学 | A kind of low-power consumption vibration wire sensor and excitation detection method thereof |
| CN206095270U (en) * | 2016-09-14 | 2017-04-12 | 智性科技南通有限公司 | A wireless vibrating wire sensing signal conditioning ware for civil structure health monitoring |
| CN109341732A (en) * | 2018-11-23 | 2019-02-15 | 上海建工集团股份有限公司 | A kind of vibrating string type sensor parameter measurement circuit and method |
-
2021
- 2021-12-28 CN CN202111632208.1A patent/CN114440936A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936754A (en) * | 2010-09-01 | 2011-01-05 | 南京卡尔胜水电科技有限公司 | On-line self-correcting method of measuring data of dam safety monitoring automated data acquisition device |
| CN204302725U (en) * | 2014-12-18 | 2015-04-29 | 交通运输部天津水运工程科学研究所 | A kind of multi-sensor data collection and real time remote conveyer |
| CN205027378U (en) * | 2015-09-29 | 2016-02-10 | 南京南瑞集团公司 | Multichannel vibration wire formula sensor data collection module |
| CN106289034A (en) * | 2016-08-01 | 2017-01-04 | 长安大学 | A kind of low-power consumption vibration wire sensor and excitation detection method thereof |
| CN206095270U (en) * | 2016-09-14 | 2017-04-12 | 智性科技南通有限公司 | A wireless vibrating wire sensing signal conditioning ware for civil structure health monitoring |
| CN109341732A (en) * | 2018-11-23 | 2019-02-15 | 上海建工集团股份有限公司 | A kind of vibrating string type sensor parameter measurement circuit and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115452203A (en) * | 2022-11-08 | 2022-12-09 | 常州金土木工程仪器有限公司 | Dynamic measuring circuit of vibrating wire sensor |
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