Optical fiber extrinsic Fabry-Perot interference ultrasonic sensing and detection device

Abstract

The invention discloses an optical fiber extrinsic Fabry-Perot interference ultrasonic sensing and detection device, comprising a 1550nm light source, a 1550nm optical circulator, an optical fiber Fabry-Perot ultrasonic sensor, a photoelectric transition module, a signal amplification module, an oscillograph, a piezoelectric transducer and a signal generator. The basic structure of the optical fiber Fabry-Perot ultrasonic sensor is composed of a single mode optical fiber, a quartz vibrating membrane, an outer ceramic bushing, an inner ceramic bushing and a metal base. The light emitted by the 1550nm light source reaches the optical fiber Fabry-Perot ultrasonic sensor through the optical circulator, when ultrasonic wave acts on the ultrasonic sensor, as the light reflected by the optical fiber Fabry-Perot ultrasonic sensor is modulated by the ultrasonic signal, the reflected light reaches the photoelectric conversion module by the circulator and then is converted into an electric signal, and the ultrasonic signal can be observed by the oscillograph after amplification. The invention has simple structure, easy manufacture, low cost and high sensitivity, strong practicability, easy encapsulation and is convenient for mass production, and can be applied to related fields of industrial detection, power system safety and the like.

Description

technical field [0001] The invention uses the optical fiber extrinsic Fabry-Perot interference ultrasonic sensing device to detect the acoustic emission source, especially for detecting ultrasonic signals generated by acoustic emission sources such as material damage and transformer partial discharge, and belongs to the optical fiber sensing field, Background technique [0002] Acoustic emission sources in the usual sense generally refer to various deformation and fracture mechanisms produced by materials under the action of external forces. When this mechanism occurs, it will be accompanied by the generation of stress waves and spread to the surroundings. Acoustic emission is an important non-destructive testing and evaluation method. It uses highly sensitive sensors to accept the damage from these materials or components when they are subjected to external forces and long before they are damaged. Acoustic emission signals, through the analysis and processing of these sign...

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Problems solved by technology

[0005] The traditional ultrasonic detection method is to use piezoelectric transducers to detect ultrasonic waves. Th

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