Optical fiber sound pickup, and preparation method and preparation device thereof

Abstract

The invention discloses an optical fiber sound pickup. The optical fiber sound pickup is composed of the following parts: a shell with a cylindrical structure; a diaphragm fixed on one side end face of the shell; a ferrule with a cylindrical body part, wherein at least one part of the body part is fixed in the shell by means of matching with the inner wall of the shell, and there is a predetermined distance between a first end part of the body part close to the diaphragm and the diaphragm; and an optical fiber, which is fixed in the ferrule in a penetrating way, wherein the end face of the optical fiber is flush with the surface of the first end part. The invention further discloses a preparation method and a preparation device of the optical fiber sound pickup. The optical fiber sound pickup provided by the invention simplifies the structure, reduces the cost, can achieve mass production, and has the desired measurement sensitivity.

Description

technical field [0001] The invention relates to a sound pick-up, in particular to an optical fiber sound pick-up, a preparation method and a preparation device thereof. Background technique [0002] In recent years, the measurement of human breath sounds has become a research hotspot. Many medical institutions and universities have carried out research on human breath sound measurement technology. Among them, the optical fiber FP cavity pickup has become an important research direction in the field of breath sound measurement. [0003] Patent document 201410247134.3 discloses an optical fiber FP cavity acoustic wave sensing probe, which uses a spring structure to alleviate mechanical vibration, and can improve stability and suppress zero-point drift. The spring structure adopts threaded connection, and the accuracy of the threaded connection is the key to the consistency of sensor performance, but it can only rely on manual adjustment one by one to ensure the performance of ...

AI Technical Summary

Problems solved by technology

The spring structure adopts threaded connection, and the accuracy of threaded connection is the key to the consistency of the performance of the sensor, but it can only rely on the method of manual adjustment one by one to ensure the performance of the probe, and the production efficiency of this processing method is very low

At the same time, the shell is made of metal material with a large thermal expansion coefficient, which leads to serious temperature drift of the sensor.

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