Full single-mode fiber F-P sensor and manufacturing method thereof

Abstract

The invention provides a full single-mode fiber F-P sensor and a manufacturing method thereof. The full single-mode fiber F-P sensor is made of full single-mode fibers, multiple times of cutting are not needed, the fibers are welded for multiple times, the operation is simple, and the cost is low, and meanwhile, the cross sensitivity problem between the single-mode fibers and the multi-mode fiberscan be reduced; the number of welding times is small, and the problem that the mechanical strength of the sensor is reduced due to the fact that the loss is increased by welding the fibers for many times is effectively solved. The full single-mode fiber F-P strain sensor is obtained by adopting a chemical corrosion method, and is small in structure and less in temperature influence, can measure the pressure and strain, and the problem of cross sensitivity is reduced.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an all-single-mode optical fiber F-P sensor and a manufacturing method thereof. Background technique [0002] With the advent and development of optical fiber, optical fiber sensing technology is gradually becoming mature, and it is also in the stage of industrial formation and technology popularization at home and abroad. As an important part of the core device of optical fiber communication, fiber optic Fabry-Perot (F-P) also plays a vital role in the field of fiber optic sensing. At the same time, the optical fiber F-P interferometer can directly form a sensor, which is widely used in the measurement of strain, temperature, refractive index, pH, pressure and other parameters. It has an irreplaceable position. The optical fiber F-P interferometer technology is widely used in the health monitoring of aircraft. State monitoring of ships, structural safety detection of large ...

AI Technical Summary

Problems solved by technology

The above manufacturing method, due to the high requirements of the manufacturing system and process technology, leads to high manufacturing costs of the fiber optic F-P interferometer, and the quality of the F-P cavity is easily affected by the processing technology, so the fiber optic F-P interferometer is greatly restricted in engineering applications

[0004] The Chinese patent "a symmetrical all-fiber fiber optic sensor and its manufacturing method" with the authorized patent number of 201510660838.8 discloses a symmetrical all-fiber fiber sensor, which welds two sections of multi-mode fiber and two sections of single-mode fiber respectively. , the ends of the two sections of multimode fiber are provided with concave cavities, and the concave cavities of the two sections of multimode fiber are connected to form an F-P cavity. The fiber is cut and fused multiple times, and the operation is cumbersome, and the length of the multimode fiber is short. Optical fiber increases the loss and reduces the mechanical strength of the sensor

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