Optical fiber angle sensor and preparation method thereof

Abstract

The invention provides an optical fiber angle sensor. The optical fiber angle sensor comprises an optical fiber sensing unit and a flexible packaging unit, the optical fiber sensing unit comprises an input optical fiber, a U-shaped optical fiber group and an output optical fiber which are cascaded in sequence, the U-shaped optical fiber group comprises n U-shaped optical fibers arranged in the same plane, the n U-shaped optical fibers are cascaded in sequence to form a snakelike line shape, and n is an integer greater than or equal to 2; the optical fiber sensing unit is packaged in the flexible packaging unit, and the refractive index of the flexible packaging unit is smaller than that of an optical fiber core in the optical fiber sensing unit. The optical fiber angle sensor is simple in structure and has high precision and sensitivity.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber angle sensor and a preparation method thereof. Background technique [0002] In recent years, angle sensors have gradually become a research hotspot in the fields of industrial buildings, human motion and health monitoring. Generally, angle sensors based on electricity realize sensing by detecting changes in electrical properties such as resistance, capacitance, and voltage of the sensing unit. However, the electrical sensing unit is easily affected by factors such as electromagnetic interference, which hinders its application development. Optical-based sensing units, especially fiber-optic sensing, have the advantages of strong anti-electromagnetic interference, high sensitivity, and compact structure, and are more suitable for human motion and health monitoring. [0003] Fiber optic angle sensors are usually divided into two types: one is based ...

AI Technical Summary

Problems solved by technology

Although plastic optical fiber has many advantages above, there is a key problem as an optical fiber angle sensor: low sensitivity

In order to improve the sensitivity of the plastic optical fiber, the structure of the optical fiber itself is mostly modified, such as grooves, tapers, side polishing, etc., but most of the light beams passing through these optical fiber angle sensing units are still transmitted in the fiber core. It is difficult to obtain a higher sensitivity when the optical loss variation is characterized by the angle

[0005] Therefore, the existing optical fiber angle sensors mainly have technical problems such as low measurement sensitivity, complex structure, and difficult manufacturing.

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