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Liquid core angle sensor

An angle sensor and liquid core technology, applied in the field of flexible wearable sensing, can solve the problems of limiting the application of optical fiber flexible sensors, low stretchability, poor flexibility, etc., so as to save the process of sealing the hose and reduce the production cost , high safety effect

Active Publication Date: 2021-05-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Embodiment Construction

[0018] Such as figure 1 As shown, the liquid core angle sensor of the present invention includes a closed hose 2 filled with liquid 1 and two optical fibers (first optical fiber 3 and second optical fiber 4). "Liquid core" means that the hose 2 is filled with the liquid 1 . Because the hose 2 is filled with the liquid 1, the deformation of the liquid caused by the change of the bending angle of the sensing position can cause the change of the signal light transmittance, so the angle sensing can be realized by measuring the loss of the signal light caused by the deformation of the sensing position . The refractive index of liquid 1 is less than or equal to the refractive index of hose 2 . Generally, the optical fiber can be a silica optical fiber or a polymer optical fiber. In the present invention, one end 31 of the first optical fiber is placed outside the hose 2 to connect to the light source 5 ; one end 41 of the second optical fiber is placed outside the hose 2 to conne...

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Abstract

The invention discloses a liquid core angle sensor, which comprises a closed hose filled with liquid and two optical fibers, the refractive index of the liquid is less than or equal to the refractive index of the hose, one end of the two optical fibers is placed outside the hose, The other end is placed in the liquid of the hose, the end faces of the two optical fibers placed in the liquid are facing each other and do not touch, and the two optical fibers can be coupled through the liquid. The sensing position of the liquid core angle sensor of the present invention is located between the end faces of the two optical fibers inserted into the hose. The input light enters one of the fibers, couples to the other fiber through the liquid in the hose, and exits the detector through this fiber. When the hose is bent, the coupling state of the two optical fibers changes, and the output light intensity decreases. By establishing a one-to-one correspondence between the light intensity change and the angle, angle sensing is realized. The invention has the characteristics of high sensitivity, good repeatability, strong robustness and anti-electromagnetic interference, and the measurement range and measurement accuracy can be adjusted.

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. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/26
CPCG01B11/26
Inventor 张磊潘婧
Owner ZHEJIANG UNIV
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