Optical fiber grating-based acoustic emission detection device

Abstract

The invention discloses an optical fiber grating-based acoustic emission detection device. The optical fiber grating-based acoustic emission detection device comprises an acoustic emission device, anoptical fiber detection module, a piezoelectric sensor, a preamplifier and a data acquisition module; (1), an acoustic emission module comprises an exciter for generating an acoustic signal and a substrate as an acoustic propagation medium; (2), the optical fiber detection module comprises a light source, an optical coupling module, an optical fiber grating sensor and a photoelectric conversion module; (3), the acoustic emission detection device further comprises an alternative analog switch; the optical fiber grating sensor and the piezoelectric sensor are arranged on the substrate. The optical fiber grating-based acoustic emission detection device is compact in structure, can flexibly select the sensor, and has rich functions.

Description

technical field [0001] The invention relates to an acoustic emission detection device based on a fiber grating. Background technique [0002] In recent decades, acoustic emission testing technology has developed rapidly as a new non-destructive testing technology. Acoustic emission (AE) is a phenomenon in which a local source in a material releases energy rapidly to generate a transient elastic wave, sometimes called stress wave emission. Under external conditions, the phenomenon that the defect or potential defect of a solid (material or part) changes state and automatically emits a transient elastic wave is also called acoustic emission. Deformation and crack growth of materials under stress are important mechanisms of structural failure. This source, which is directly related to the deformation and fracture mechanism, is the acoustic emission source. In recent years, fluid leakage, friction, impact, etc., another elastic wave source that has nothing to do with the defo...

AI Technical Summary

Problems solved by technology

[0003] Existing sound emission detection devices have relatively simple functions, such as using piezoelectric sensors alone for detection, or fiber grating sensors for detection, which cannot strengthen the advantages of the two types of detection

[0004] Due to the need to take into account the detection range and accuracy, the existing signal amplifiers cannot adapt

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