A low-temperature optical fiber sound sensor system

Abstract

The invention provides a low-temperature optical fiber sound sensing system, comprising: an optical fiber sound sensing probe, including a sound sensing structure, a temperature measuring optical structure and a light transmission fiber; an optical fiber branching unit for combining light of different wavelengths in the optical fiber and beam splitting; an optical temperature measurement module, used to measure the temperature in the optical fiber sound sensing probe, using light of the first wavelength; an optical heating module, used to heat the optical fiber sound sensing probe, using light of the second wavelength; optical The sound measuring module is used for restoring the light change signal returned by the optical fiber sound sensing probe to sound information, and adopts the third wavelength light. The invention solves the problem that the traditional electrical sound sensor cannot meet the needs of low temperature use due to its own electronic components, thus causing the sensor to not work normally at low temperature.

Description

technical field [0001] The invention relates to the technical field of sound measurement, in particular to a low-temperature optical fiber sound sensing system. Background technique [0002] A sound sensor is a common instrument used to pick up or measure sound. Cryogenic acoustic sensors have important applications in scenarios such as acoustic monitoring of cryogenic storage rooms, acoustic monitoring of cryogenic liquid tanks, and space acoustic detection. [0003] Limited by the low-temperature tolerance of general-purpose electronic components, the low-temperature operating temperature of traditional capacitive, piezoelectric, and piezoresistive electrical sound sensors usually does not exceed -70°C, and cannot continue to be used in a lower temperature environment. The fiber optic sound sensing probe itself only includes fiber optic components and a simple mechanical structure. It does not need power supply and does not need to consider the electrical properties of ma...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, the present invention provides a low-temperature optical fiber sound sensing system, which solves the problem that the traditional electrical sound sensor cannot meet the requirements of low-temperature use due to its own electronic components, which in turn causes the sensor to fail at low temperature. The problem of normal work, and the problem that the existing optical fiber sound sensor has a non-linear thermal expansion coefficient in the low temperature region, so that the temperature compensation method cannot be used to accurately measure the sound

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