Temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technologies

A technology of temperature sensor and ring-down spectroscopy, which is applied in the field of temperature sensors based on Sagnac interference and ring cavity ring-down spectroscopy technology, can solve the problem of low sensitivity of optical fiber sensors and achieve the effect of improving the sensitivity of temperature measurement

Active Publication Date: 2018-03-16
HEILONGJIANG INST OF TECH
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  • Abstract
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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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  • Temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technologies
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  • Temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technologies

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[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] Such as figure 1 As shown, specifically, the present invention relates to a temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technology, which includes: DFB fiber laser, polarizer, electro-optical modulator, isolator, ring-down loop, A photodetector; the DF...

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Abstract

The invention relates to a temperature sensor based on Sagnac interference and ring cavity ring-down spectroscopy technologies. The temperature sensor comprises a DFB fiber laser, a polarizer, an electro-optic modulator, an isolator, a ring-down loop, and a photoelectric detector that are arranged successively along a light path direction. The ring-down loop consists of a first coupler, a second coupler, a Sagnac interference ring, a circulator, a filter, an EDFA amplifier, and a third coupler that are arranged successively along the light path direction. After pulsed light generated by the photoelectric detector passes through the isolator, the light enters the ring-down loop from a one-percent input terminal of the first coupler; the pulsed light circulates in the ring cavity for one cycle; the part of energy is outputted by a one-percent terminal of the third coupler; and the photoelectric detector converts the energy into a voltage signal that is displayed by an oscilloscope. The sensitivity of the temperature sensor is 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 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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 李林军杨玉强杨曦凝
Owner HEILONGJIANG INST OF TECH
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