Excitation detection device and method for low power consumption vibrating wire transducer

Abstract

The invention discloses an excitation detection device for a low power consumption vibrating wire transducer. The device comprises an exciting circuit unit, a pickup vibrating circuit unit and a main control unit, wherein the main control unit comprises a pre-vibration module, a compound vibration module, a frequency detection module and a signal processing module; the signal processing module is used for recording effective compound vibration frequency signals, controlling the excitation detection flow of the transducer to enable the transducer to work in stable and unstable modes and computing the excitation frequency value output by the compound vibration module in the stable working mode according to the recorded effective compound vibration frequency values. The low power consumption vibrating wire transducer provided by the invention has the beneficial technical effects that the vibrating wire excitation modes are changed, the traditional low voltage swept excitation mode is changed to the pre-vibration and compound vibration combined excitation mode, and the frequency value during pre-vibration detection serves as the excitation pulse frequency of compound vibration, thus achieving the effect of saving energy.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a vibrating wire sensor used for displacement or deformation measurement of structures. Background technique [0002] In the daily maintenance of large structures, it is very important to measure the deformation or displacement of its key components. The stress magnitude and distribution changes of the above-mentioned stressed components most directly reflect the health of the structure. Therefore, the stress status monitoring of these components And the safety analysis and evaluation based on this is of great significance. [0003] At present, the sensitive element of the vibrating wire sensor is a metal wire string, which is connected and fixed with the force-bearing part of the sensor. Various physical quantities are measured by using the relationship between the natural frequency of the steel string and the applied tension on the steel string. The vibrating wire sensor It is...

AI Technical Summary

Problems solved by technology

[0005] However, since the frequency sweep signal is a continuous pulse signal from the lower frequency limit to the upper frequency limit, in order to ensure the excitation effect, the pulse of each frequency must last for several cycles, and the excitation time is too long, resulting in high energy consumption, which limits the sensor In the application of remote unattended measurement system, in order to improve the battery life and save energy consumption, the electric excitation method of the vibrating wire sensor must be improved

Images