A temperature sensor based on sagnac interferometry and ring cavity ring-down spectroscopy

Abstract

The invention relates to a temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technology, which sequentially includes: a DFB fiber laser, a polarizer, an electro-optic modulator, an isolator, a ring-down loop, and a photodetector along the direction of the optical path; The ring-down loop sequentially includes along the direction of the optical path: a first coupler, a second coupler, a Sagnac interference ring, a circulator, a filter, an EDFA amplifier, and a third coupler; the pulsed light generated by the electro-optic modulator passes through the After the isolator, the 1% input end of the first coupler enters the ring-down loop, and the pulsed light circulates once in the ring cavity, and part of the energy is obtained by 1% of the third coupler. terminal output, the photodetector converts it into a voltage signal, which is displayed by an oscilloscope. The sensitivity of the temperature sensor based on Sagnac interferometry 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 Sagnac interference 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 sensitivity has become an urg...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to develop a temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technology in order to solve the technical problem that the sensitivity of the current optical fiber sensor is not high

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