Long-distance high-spatial-resolution Raman temperature measurement sensor and realization method thereof

Abstract

The invention is mainly used for the optical fiber sensing temperature measurement field, and especially relates to a long-distance high-spatial-resolution Raman temperature measurement sensor and a realization method thereof. The long-distance high-spatial-resolution Raman temperature measurement sensor is characterized in that the long-distance high-spatial-resolution Raman temperature measurement sensor comprises an ultra-narrow-linewidth laser, a circulator, an acoustic-optic modulator, a reflector, a radio frequency generator, a 1*2 optical splitter (1:1), two wavelength division multiplexers, a Raman amplifier, an EDFA, two 2*1 couplers, a photoelectric detector, a signal processing and collection unit and a microprocessor unit. The beneficial effects are that the invention discloses the realization method of the long-distance high-spatial-resolution Raman temperature measurement sensor; the monitoring distance of the Raman temperature measurement sensor based on OTDR is generally smaller than 10 km, and spatial resolution is generally larger than 1 m; and the invention provides the realization method of the Raman temperature measurement sensor based on OFDR location technique, wherein the method can greatly improve measuring distance and spatial resolution index of the system, and the method can enable the monitoring distance of the Raman temperature sensor to reach 20 km, and spatial resolution index to reach the centimeter scale.

Description

technical field [0001] The invention is mainly used in the temperature measurement field of optical fiber sensing, and in particular relates to a long-distance high-spatial resolution Raman temperature measurement sensor and a realization method thereof. technical background [0002] Optical fiber Raman temperature sensor is a kind of optical fiber sensing product developed in recent years for real-time measurement of space temperature field. This system uses Raman scattering effect and OTDR technology to realize distributed measurement of temperature field of sensitive optical fiber. Compared with traditional electrical temperature sensors, optical fiber Raman temperature sensors have the advantages of high sensitivity, anti-electromagnetic interference, light weight, and long life, so they can be widely used in power cables, subway tunnels, coal mine roadways, oil storage tanks, and large buildings. temperature monitoring and fire alarm. [0003] However, due to the use o...

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Problems solved by technology

[0003] However, due to the use of OTDR technology for positioning cannot achieve high spatial resolution, the current optical fiber Raman temperature sensor based on OTDR technology cannot guarantee high spatial resolution and measurement distance. The current Raman optical fiber temperature sensor based on OTDR technology has a general measurement distance. It is several kilometers, and the spatial resolution is generally greater than 1 meter. Such technical indicators can meet some temperature measurement applications. However, applications such as engine temperature measurement, belt conveyor roller temperature measurement, and substation switch cabinet contact temperature measurement are based on OTDR's Raman fiber optic temperature sensor will no longer be applicable

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