Frequency measuring method of vibrating wire type sensor

A vibrating wire sensor, frequency measurement technology, applied in the measurement of resonance frequency, measurement device, measurement of ultrasonic / sound wave / infrasonic wave, etc., can solve the problems that cannot meet the requirements of reliability, accuracy and speed, so as to ensure reliability, The effect of expanding the sweep range

Active Publication Date: 2018-05-18
ZHEJIANG UNIV
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Problems solved by technology

Both the high-voltage excitation and the traditional low-voltage frequency sweep method have

Method used

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  • Frequency measuring method of vibrating wire type sensor
  • Frequency measuring method of vibrating wire type sensor

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Embodiment Construction

[0026] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the present invention is a frequency measurement method of a vibrating wire sensor, comprising the following steps:

[0028] S01, when measuring for the first time, perform a low-voltage frequency sweep according to the maximum frequency range set by the sensor at the factory, measure the first response frequency f1 and store it in the memory.

[0029] S02, during the second measurement, narrow the frequency sweep window range according to the sensor installation location and application indicators.

[0030] S03, taking the first frequency f1 as the median value, and performing frequency scanning according to the current frequency scanning window range.

[0031] S04, judge whether there is a response frequency, if yes, execute step 5, otherwise, expand the range of the frequency sweep window and return to S03.

[0032] S05, s...

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Abstract

The invention provides a frequency measuring method of a vibrating wire type sensor. The frequency measuring method of a vibrating wire type sensor is characterized by for the previous two times of measurement, according to the leave-factory characteristics and mounting position of the sensor, using a large-range frequency sweeping technology and a wide window median frequency sweeping technologyto quickly find out the approximate measurement frequency, using a memory to store the measurement result; in the subsequent measurement, using a dynamic window frequency sweeping measurement method taking the historical data as the median, deciding the frequency sweeping median by means of the last data recorded in the memory, obtaining the frequency sweeping window range by means of weighted calculation of the fluctuation situation of the historical data, wherein the smaller the frequency sweeping window range every time becomes, and the higher the accuracy becomes; and when no resonance results appear in the frequency sweeping range, utilizing an upward backtrack method and an original replacement method to expand the frequency sweeping range. The frequency measuring method of a vibrating wire type sensor overcomes the defects that a traditional high voltage excitation mode is low in accuracy and large in damage and a traditional low voltage frequency sweeping mode consumes long time, and has the advantages of high accuracy, short consumed time, and low damage to the sensor.

Description

technical field [0001] The invention belongs to the technical field of engineering monitoring, in particular to a frequency measurement method of a vibrating wire sensor. Background technique [0002] The vibrating wire sensor has the advantages of simple structure, strong and durable, strong anti-interference ability, reliable measurement value, high precision and resolution, and good stability. In addition, its output is a frequency signal, which is convenient for long-distance transmission and can be directly interfaced with a computer. Therefore, in the safety monitoring of project engineering, especially in outdoor large-scale civil engineering, bridges, and geotechnical projects, vibrating wire sensors are usually used for monitoring The physical quantities of the project, such as pressure, displacement, temperature, deformation, leakage, etc., are used to judge the operation status of the project and predict some geological disasters or project loopholes. [0003] Th...

Claims

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Application Information

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IPC IPC(8): G01H13/00
Inventor 王勇陈永亮
Owner ZHEJIANG UNIV
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