Piezoelectric ultrasonic guided wave detection device and method

Abstract

The invention provides a piezoelectric ultrasonic guided wave detection device and method. The piezoelectric ultrasonic guided wave detection device comprises a main control module, a driving circuit module, a monitoring circuit module, a temperature detection module, a strain detection module, at least two piezoelectric sensing elements, at least one temperature sensing element and at least one strain sensing element, wherein the main control module is connected with the at least one first piezoelectric sensing element through the driving circuit module, the at least one second piezoelectric sensing element is connected with the main control module through the monitoring circuit module, the main control module is connected with at least one temperature sensing element through the temperature monitoring module, and the main control module is connected with at least one strain sensing element through the strain monitoring module. According to the invention, the stable control of the transmitted signal is realized, the resonance of the transmitted signal is eliminated, and the noise of the transmitted signal is reduced; timely protection and alarm prompt for short circuit of the piezoelectric sensing element are realized; the crosstalk between the channels is eliminated; and the applicability of the instrument under different working conditions is improved.

Description

technical field [0001] The invention relates to the field of structural health monitoring, in particular to a detection device and a detection method based on piezoelectric ultrasonic guided waves. Background technique [0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art. [0003] Structural health monitoring is a description of whether the working state of the structure is normal or not. Sensors are used to obtain structural operating parameters, and the characteristic information required for health status diagnosis is obtained through data processing. By fusing various characteristic information, the status monitoring, fault diagnosis, and prediction of the structure are realized, and health status information that can be used for maintenance and decision-making is generated. [0004] Piezoelectric sensing elements, also known as piezoelectric transducers, are devices that use t...

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Problems solved by technology

[0007] (1) The transmission waveform for driving the piezoelectric sensing element cannot be accurately controlled, the harmonic component of the waveform is relatively large, and the waveform is prone to resonance at high frequencies, resulting in relatively poor system stability;

[0008] (2) It is impossible to make timely protection against the short circuit of the piezoelectric sensing element;

[0009] (3) Cannot effectively reduce crosstalk between channels caused by waveform transmission

[0010] (4) Because different materials have different degrees of attenuation to ultrasonic waves, under the same transmitted signal, the received signal amplitude of different materials will be hundreds of times different, so a single device cannot simultaneously monitor aluminum alloys, composite materials, etc. many types of structures

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