Coreless optical fiber-based tilt angle sensor capable of discriminating direction

Abstract

The invention discloses a coreless optical fiber-based tilt angle sensor capable of discriminating a direction, and relates to the field of optical fiber sensing. According to the specific connecting mode, single-mode optical fibers (311 and 312) are connected with the two ends of a non-coated coreless optical fiber (32) to form a coreless optical fiber-based interferometer; the interferometer is packaged in a packaging body (33) with a seal cavity, and the bottom surface (36) of the packaging body is a standard horizontal plane; the interferometer is obliquely arranged in the middle of the seal cavity (34), and when the bottom surface (36) of the packaging body is parallel to the horizontal plane, half of the coreless optical fiber (32) is immersed in a liquid surface (38); the refractive index of liquid is lower than that of the coreless optical fiber (32). According to the tilt angle sensor, the size and direction of a tilt angle can be simultaneously measured without a cantilever beam and / or a vertical pendulum; the detection is carried out by only the simplest coreless optical fiber without a special optical fiber device; the tilt angle sensor is good in repeatability, stable in performance, simple in structure and very low in cost, and has a good application prospect on the aspect of real-time tilt angle measurement.

Description

technical field [0001] The invention relates to a sensing structure of a direction-distinguishable inclination sensor based on a coreless optical fiber and the field of optical fiber sensing. Background technique [0002] Traditional tilt angle measurement methods are mainly divided into three categories: mechanical measurement, electromagnetic measurement and optical measurement. Among them, the mechanical measurement method has a low degree of automation, and the electromagnetic measurement method has poor electromagnetic interference ability, so these two types of sensors are obviously limited in actual use. In contrast, the optical measurement method has the advantages of insulation, anti-electromagnetic interference, and high degree of automation, and has a good application prospect. [0003] Fiber optic sensors for inclination sensing currently mainly use fiber gratings and their extended structures as detection elements, which need to be combined with cantilever beam...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the problem that the existing optical fiber inclination sensor relies on the cantilever beam and (or) pendulum; the existing optical fiber inclination sensor can only measure the inclination angle, but cannot judge the inclination direction

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