Frequency measuring method of vibrating wire type sensor

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...

AI Technical Summary

Problems solved by technology

Both the high-voltage excitation and the traditional low-voltage frequency sweep method have great defects, which can no longer meet the requirements of reliability, accuracy and speed.

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