Liquid core angle sensor

Abstract

The invention discloses a liquid core angle sensor. The angle sensor comprises a closed hose filled with liquid and two optical fibers, the refractive index of the liquid is smaller than or equal to that of the hose, one ends of the two optical fibers are arranged outside the hose, the other ends of the two optical fibers are arranged in the liquid of the hose, the end faces, arranged in the liquid, of the two optical fibers are opposite and do not make contact with each other, and the two optical fibers can be coupled through the liquid. The sensing position of the liquid core angle sensor islocated between the end faces of the two optical fibers inserted into the hose. Input light enters one optical fiber, is coupled to the other optical fiber through liquid in the hose and then is output to the detector through the optical fiber. When the hose is bent, the coupling state of the two optical fibers is changed, the output light intensity is reduced, and angle sensing is achieved by establishing the one-to-one correspondence relation between the light intensity variation and the angle. The angle sensorhas the advantages of being high in sensitivity, good in repeatability, high in robustness and resistant to electromagnetic interference, and the measuring range and the measuring precision are adjustable.

Description

technical field [0001] The invention relates to an optical fiber angle sensor and a preparation method thereof, belonging to the field of flexible and wearable sensing. Background technique [0002] Flexible sensors play an important role in hot fields such as wearable devices, robots, and human-computer interaction, and have broad development prospects in application scenarios such as rehabilitation medicine, robot haptics, and virtual reality. [0003] With the development of flexible conductive materials, flexible wearable sensors have gradually become a research hotspot. Electrically-based flexible sensors generally realize sensing by detecting changes in electrical properties such as resistance, capacitance, and inductance of the sensing unit. Its basic structure is to encapsulate the conductive sensing unit in a flexible material. When the conductive sensing unit of the sensor is mechanically deformed, the electrical properties of the conductive sensing unit change. ...

AI Technical Summary

Problems solved by technology

However, the currently reported fiber optic sensors have high rigidity, low stretchability, easy to break under large-angle bending deformation, and poor flexibility, which limits the application of fiber optic flexible sensors in wearable devices, robotic haptics, etc.

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