An excitation detection device and excitation detection method of a low-power vibrating wire sensor

Abstract

The invention discloses an excitation detection device for a low-power vibrating wire sensor, which includes an excitation circuit unit, a vibration pickup circuit unit and a main control unit; the main control unit includes a pre-vibration module, a re-vibration module, a frequency detection module and a signal processing module , the signal processing module records the effective re-vibration frequency signal, and controls the excitation detection process of the sensor at the same time, so that the sensor works in two modes: steady state and unsteady state, and calculates the steady-state work according to the recorded effective re-vibration frequency value The excitation frequency value output by the re-vibration module in mode. The invention provides a vibrating wire sensor with low power consumption, which changes the excitation mode of the vibrating wire, changes the traditional low-voltage sweep frequency excitation mode into the excitation mode of pre-vibration combined with re-vibration, and detects the frequency during pre-vibration The value is used as the excitation pulse frequency for re-vibration, thus achieving the effect of energy saving.

Description

Technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a vibrating wire sensor for measuring the displacement or deformation of a structure. 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 force size and distribution changes of the above-mentioned stressed members most directly reflect the health of the structure, so the force status of these components is monitored And the safety analysis and evaluation on this basis 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 the relationship between the natural frequency of the steel string and the applied tension on the steel string. It is currently one of the most advanced sensors i...

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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

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