Optical fiber grating temperature measuring device and measuring method

Abstract

An optical fiber grating temperature measuring device comprises a broadband light source, an optical fiber coupler, a tunable optical fiber filter, an optical fiber, an optical fiber grating sensor, an optical detection circuit module and a measurement control module, wherein the output of the optical fiber coupler can be divided into two ways, the two ways enter into two sensor optical fiber grating arrays connected in series through optical fibers, one of the sensor optical fiber grating array comprises a plurality of horizontally arranged optical fiber gratings, the other sensor optical fiber grating array comprises a plurality of vertically arranged optical fiber gratings, the horizontally arranged optical fiber gratings and the vertically arranged optical gratings are interlapped in space, so as to form a rasterized optical fiber grating. Through the adoption of the variable grating, real time temperature change of any lattice point in the area can be obtained, and through the parameter self-correcting comparison, and mean value, network node redundancy, reliability of the system is improved.

Description

technical field [0001] The invention relates to a temperature measurement system, in particular to a fiber grating temperature measurement system. Background technique [0002] In order to realize the monitoring of a dynamic temperature point on the surface of the photoelectric integrated cable, the temperature must be monitored in the cylindrical area where the dynamic temperature point is located. The traditional temperature measurement methods include thermocouples, infrared thermometers, etc. Thermocouples have a limited transmission distance and cannot achieve long-distance transmission. The signal drifts a lot and needs to be calibrated regularly. Because it belongs to point measurement, it can only monitor the temperature point, and cannot realize the temperature monitoring of the area. To realize the monitoring of the entire cylindrical area, multiple points can only be arranged one by one and fill the cylindrical surface area. All sensitive resistors need to be wir...

AI Technical Summary

Problems solved by technology

[0005] The grating array structure of the above-mentioned distributed fiber grating temperature detection system is linear, that is, the fiber grating is arranged in series along the optical fiber. There may be large errors in temperature measurement, and the system reliability is low

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