All-fiber temperature sensor based on fiber core mismatch attenuators

Abstract

The invention relates to a manufacturing method for an all-fiber temperature sensor based on fiber core mismatch attenuators, and belongs to the technical field of manufacture of optical fiber sensors. The method includes the steps that an optical fiber fusion splicer discharges electricity twice so as to conduct fusion splicing on single-mode optical fibers placed in a staggered mode, the two fiber core mismatch attenuators are formed, and then a new sensing structure is formed through processing of the optical fiber fusion splicer and an optical fiber tapering machine. Optical path differences meeting conditions can be generated through the fusion splicing structure and optical fibers, and the Mach-Zehnder interference condition is met. When external temperature, the refractive index and other conditions change, the effective optical path differences of the sensing part optical fibers change, and then a through transmission spectrum drifts. The whole structure of the sensor is easy to manufacture, and the mechanical strength and sensitivity are high; the single-mode optical fibers are adopted, cost is reduced, the influence of cross sensitivity of a traditional optical fiber sensor is avoided, accuracy is improved, and the detection result has good repeatability.

Description

technical field [0001] The invention relates to a manufacturing method of an all-optical fiber temperature sensor based on a fiber core mismatch attenuator, and belongs to the technical field of optical fiber sensor manufacturing. Background technique [0002] At present, fiber optic sensors are mostly based on Fabry-Perot interference, Long-period gratings, Bragg gratings, Michelson interferometers and Mach-Zehnder. Zehnder) interferometer principle, the new sensor is based on the Mach-Zehnder interferometer (MZI) principle. T.Hu, Y.Wang, C.Liao, and D.Wang, "Miniaturized fiber in-line Mach-Zehnder interferometer based on inner air cavity for high-temperature sensing", Optics Letters, 37(24), 5082-5084 (2012) published a manufacturing method for processing cavities on optical fibers is a relatively common method, but the processing process is too cumbersome and the sensitivity is not high enough. And Li B, Jiang L, Wang S, Zhou L, Xiao H and Tsai H L, "Ultra-Abrupt Tapere...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the complex problem of making the existing all-fiber temperature sensor, and propose a method for making the all-fiber temperature sensor based on the core mismatch attenuator, using a fiber fusion splicer to discharge and weld misplaced single-mode optical fibers to form new sensing structure

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