Oscilloscope detection temperature sensor based on parallel connection of Sagnac loop and FP cavity

Abstract

The invention relates to an oscilloscope detection temperature sensor based on parallel connection of a Sagnac loop and an FP cavity, which comprises a first coupler, an isolator, a second coupler, anFP cavity, an attenuator, a third coupler a Sagnac loop, a fourth coupler and a flat top grating, and is characterized in that the first coupler is connected with the isolator and a first inlet of the second coupler, one part of a first outlet of the second coupler is connected with an inlet of the FP cavity, the other part of the first outlet of the second coupler is connected with the Sagnac loop through the attenuator and the third coupler, one part of a second inlet of the second coupler is connected with an outlet of the FP cavity, the other part of the second inlet of the second coupleris connected with the attenuator, a second outlet of the second coupler is connected with a first inlet of the fourth coupler, a first inlet of the fourth coupler is connected with an inlet of the flat top grating, an outlet of the flat top grating is connected with a second inlet of the fourth coupler, a second outlet of the fourth coupler is connected with a photoelectric detector and an oscilloscope. The sensitivity of the temperature sensor based on the parallel connection of the Sagnac loop and the FP cavity is improved by dozens of times than that of a temperature sensor based on a single Sagnac loop structure by using a vernier effect.

Description

technical field [0001] The invention relates to an oscilloscope detecting temperature sensor, in particular to an oscilloscope detecting temperature sensor based on a Sagnac ring connected in parallel with an FP cavity. 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 b...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the sensitivity of the current optical fiber sensor is not high, and develops an oscilloscope detection temperature sensor based on Sagnac ring and FP cavity in parallel

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