A temperature sensor based on interferometric vernier effect and annular cavity ring-down spectroscopy

Abstract

The invention relates to a temperature sensor based on the vernier effect of the interference spectrum and the ring cavity ring down spectrum technology. Detector; The ring-down loop includes successively along the optical path direction: a first coupler, a second coupler, a Sagnac interference ring, a circulator, a flat-top grating, an EDFA amplifier, and a third coupler; the continuous light emitted by the light source passes through After the polarizer and the electro-optic modulator become pulsed light, the pulsed light enters the ring-down loop from the 10% input end of the first coupler after being reflected by the FP cavity, so The pulsed light circulates once in the ring-down loop, and part of its energy is output by 1% of the third coupler, which is converted into a voltage signal by the photodetector and displayed by an oscilloscope. The sensitivity of the temperature sensor based on the vernier effect of the interference spectrum and ring cavity ring-down spectroscopy technology is increased by dozens of times.

Description

technical field [0001] The invention relates to an oscilloscope detecting temperature sensor, in particular to a temperature sensor based on the interference spectrum vernier effect and ring cavity ring-down spectrum technology. Background technique [0002] At present, the sensitivity of temperature sensors based on fiber gratings is too low, only about 10pm / ℃. The sensitivity of temperature sensors based on long-period gratings is relatively high, but there are problems of cross-sensitivity to bending and external materials. Based on fiber optic Mach-Zehnder interferometers Or the temperature sensor of the fiber optic Michelson interferometer is cross-sensitive to external vibrations. Although compared with the above temperature sensors, the temperature sensor based on a single Sagnac ring interference has a stronger ability to resist external interference, but its sensitivity is usually only about 1nm / °C. Therefore, developing an optical fiber sensor with higher sensitiv...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem of low sensitivity of the current optical fiber sensor, and develop a temperature sensor based on the interferometric vernier effect and ring cavity ring-down spectroscopy technology

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