A multi-channel fiber optic ring acoustic emission detection system and demodulation method

A technology of acoustic emission detection and detection system, which is applied in the direction of using acoustic emission technology for material analysis, processing response signals of detection, etc., can solve the problems of affecting acoustic emission signal detection, phase difference, affecting demodulation, etc., and achieves low hardware cost. , the operation speed is fast, and the response frequency is wide.
CN106338549BActive Publication Date: 2019-03-26BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2019-03-26

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Abstract

The invention provides a multichannel optical fibre ring sound emission detection system and a demodulation method, and aims to detect a plurality of sound emission signals in a structure body quickly and accurately and monitor the health conditions of the structure body in real time. The sound emission detection system comprises a narrow-band light source, an isolator, a coupler, a reference optical fibre ring, a sensing optical fibre ring, a photo-electronic detection circuit, a band pass filtering circuit, a preamplifier circuit, an analogue-to-digital conversion circuit, an FPGA and a computer. The multichannel optical fibre ring sound emission detection system and the demodulation method are mainly used in the field of sound emission detection; compared with a conventional piezoelectric sensor, the multichannel optical fibre ring sound emission detection system have the advantages of anti-electromagnetic interference and high sensitivity; compared with a conventional demodulation method, the demodulation method has the advantages of simplicity, high efficiency, high calculation speed and low cost, and is beneficial to practical engineering application.
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Description

technical field

[0001] The invention belongs to the technical field of acoustic emission detection, and in particular relates to a multi-channel optical fiber ring acoustic emission detection system and a demodulation method. Background technique

[0002] Acoustic emission technology originated in the 1950s. The generation of acoustic emission signals directly comes from dynamic information such as crack defects and expansion inside components or materials. The characteristics of acoustic emission detection technology make it especially suitable for dynamic safety detection, health monitoring, integrity assessment, early damage warning and failure prevention of mechanical equipment structures, etc. Therefore, acoustic emission technology has always attracted attention. It is widely used in machinery manufacturing, petrochemical and other fields.

[0003] At present, the acoustic emission detection technology is mainly based on piezoelectric ceramic sensors. This method has ...

Claims

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