Method and system for measuring frequency of single coil vibrating instrument

Abstract

The invention relates to a method and system for measuring the frequency of a single coil vibrating instrument, wherein the method comprises the following steps: firstly, exerting alternating swept-frequency exciting signals on the two ends of a frequency measurement coil in the single coil vibrating instrument so as to drive a steel string to perform mechanical vibration; then, canceling the swept-frequency exciting signals, and forming induced voltage signals at the two ends of the frequency measurement coil, wherein the frequency of each induced voltage signal is consistent with that of the mechanical vibration of the steel ring; carrying out data acquisition on the induced voltage signals by virtue of an AD (analog-digital) converter, and carrying out FFT (fast fourier transform algorithm) spectrum analysis on the signals (acquired by the AD converter) by virtue of a digital signal processor; and finally, extracting the basic frequency signals in the spectrum according to a maximum value method, and then obtaining the frequency measurement value. The method provided by the invention has the advantages of increasing the anti-interference capacity, and improving the accuracy and reliability of frequency measurement of the single coil vibrating instrument.

Description

technical field [0001] The invention relates to the technical field of health monitoring of geotechnical engineering, in particular to a method and system for measuring the frequency of a single-coil vibrating wire instrument in safety monitoring instruments of geotechnical engineering. Background technique [0002] In the safety monitoring of geotechnical engineering, safety monitoring instruments such as vibrating wire (or steel string) instruments are usually used to monitor physical quantities such as stress and strain, temperature, joint opening, leakage and deformation of geotechnical engineering. To analyze and judge the safety of geotechnical engineering. [0003] Vibrating wire instruments (or vibrating wire transducers) consist of a homogeneous steel string fixed at both ends. The length of the steel string is L. When sensing the external force F (which can be the stress and strain of geotechnical engineering, temperature, joint opening, leakage and deformation, e...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the frequency measurement of the existing single-coil vibrating wire instrument adopts the frequency counting method to have poor anti-interference ability, which leads to the problem that the measurement accuracy and reliability decrease, and provides a novel single-coil vibrating wire instrument frequency measurement method , this method is more in line with the working principle of the single-coil vibrating wire instrument from the measurement principle, increases the anti-interference ability, and improves the accuracy and reliability of the frequency measurement of the single-coil vibrating wire instrument

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