Temperature sensor on basis of interference spectrum vernier effects and loop cavity ring-down spectrum technologies

Abstract

The invention relates to a temperature sensor on the basis of interference spectrum vernier effects and loop cavity ring-down spectrum technologies. The temperature sensor sequentially comprises a DFB(distributed feedback) fiber laser device, a polarizer, an electro-optic modulator, an isolator, an FP (Fabry-Perot) cavity, a ring-down loop and a photoelectric detector along the direction of a light path. The ring-down loop sequentially comprises a first coupler, a second coupler, a Sagnac interference ring, a circulator, a ceiling optical grating, an EDFA (erbium doped optical fiber amplifier) and a third coupler along the direction of the light path; continuous light emitted by light sources can be changed into pulsed light after being transmitted through the polarizer and the electro-optic modulator, 10% of the pulsed light is transmitted into the ring-down loop via an input end of the first coupler after the pulsed light is reflected by the FP cavity, 1% of partial energy of the pulsed light is outputted by the third coupler whenever the pulsed light is cycled in the ring-down loop by a circle, and the partial energy can be converted into voltage signals by the photoelectric detector, and the voltage signals can be displayed on an oscilloscope. The temperature sensor on the basis of the interference spectrum vernier effects and the loop cavity ring-down spectrum technologies has the advantage that the sensitivity of the temperature sensor can be improved 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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