Excitation method of vibrating wire sensor

A vibrating wire sensor and excitation technology, which is applied in the field of sensor measurement, can solve the problems of unfavorable picking and processing of vibrating wire vibration signals, short vibration duration, and attenuation of vibration amplitude, so as to prolong the vibration duration, shorten the detection time, large amplitude effect

Inactive Publication Date: 2009-11-04
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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Problems solved by technology

[0004] The traditional intermittent excitation method has poor excitation effect, small excitation amplitude and short vibration duration, which is not conducive to picking up and processing the vibration signal of the vibrating wire, which affects the measurement accuracy
The frequency sweep excita

Method used

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  • Excitation method of vibrating wire sensor
  • Excitation method of vibrating wire sensor

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Embodiment Construction

[0025] The specific embodiment of the present invention is as figure 1 Shown:

[0026] The first step, initial vibration: use the existing intermittent excitation method to excite the excitation coil of the vibrating wire sensor once;

[0027] The second step, preliminary test: process the signal of the pickup coil and measure the signal frequency. Since the intermittent excitation method will cause the vibration amplitude to be small and the vibration duration to be short, only the signal with the best quality at the initial stage of vibration is used for short-term measurement in the initial measurement process to obtain the initial measurement value f1 of the resonance frequency. Since the number of signal cycles measured during the initial measurement is small, the signal amplitude is small, and the measurement accuracy is low, the initial measurement value f1 of the frequency obtained is not accurate.

[0028] The third step, inspection: record the period (T1, T2, . As...

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Abstract

An excitation method of a vibrating wire sensor mainly comprises the following operating steps: performing single excitation for exciting coils of the vibrating wire sensor by an intermittent excitation mode to obtain a resonant frequency measured value f1 with low precision; calculating statistical characteristics of vibration signals during various periods, and inspecting the statistical characteristics; exciting the exciting coils of the vibrating wire sensor by adopting a signal with the frequency being f1 and stopping excitation after vibrating wire resonance, or performing frequency-sweep excitation at the position of a narrower bandwidth near the frequency f1; and finally processing signals from vibration pickup coils, and measuring the signal frequency to obtain a measured value f2 as an exact value of vibrating wire resonance frequency. The excitation method of the vibrating wire sensor has the advantages of fast starting of vibration, large amplitude, shortened detection time, improved working efficiency, improved excitation reliability and improved measuring precision. The excitation method of the vibrating wire sensor is applicable to observation on stress strain, deformation, seepage, liquid level, temperature and the like of the projects such as reservoir dams, bridges, foundation pits and the like.

Description

technical field [0001] The invention belongs to the category of sensor measurement, and relates to a vibrating wire sensor measuring system, in particular to a vibrating method for a vibrating wire sensor. Background technique [0002] Since the output of the vibrating wire sensor is a frequency signal, the influence of factors such as the resistance, inductance and capacitance of the cable can be ignored during the transmission process, and it has the advantages of strong anti-interference ability and easy long-distance transmission, so it is widely used in reservoir dams In the monitoring of stress and strain, deformation, seepage, liquid level, temperature, etc. of projects such as bridges, foundation pits, etc. The general working principle of the vibrating wire sensor is: the steel string is placed in the magnetic field, and after the steel string is excited by a certain method, the steel string will vibrate, and the vibrating string will move in the magnetic field to c...

Claims

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Application Information

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IPC IPC(8): G01D5/00G01D5/12G01D5/243
Inventor 贺虎王万顺李立国葛怀光田冬成孙建会熊成林
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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