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High-precision miniature torque sensor based on fiber bragg grating

A fiber optic Bragg and torque sensor technology, applied in instruments, torque measurement, measuring devices, etc., can solve the problems of poor sensor measurement force sensitivity, low torque resolution, small sensor measurement range, etc., and achieve high sensitivity and linearity, The effect of high torsional sensitivity and strong anti-torsional crosstalk performance

Active Publication Date: 2022-03-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensor still has the problems of small measurement range, low torque resolution, and relatively poor sensor force sensitivity.

Method used

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  • High-precision miniature torque sensor based on fiber bragg grating
  • High-precision miniature torque sensor based on fiber bragg grating
  • High-precision miniature torque sensor based on fiber bragg grating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: as Figures 1 to 3 As shown, a high-precision miniature torque sensor based on fiber Bragg gratings is mainly composed of a torsion-sensitive flexure structure, a fiber Bragg grating and a signal processing unit.

[0035] Wherein: the torsion-sensitive deflection structure includes a top plate 1, a bottom plate 2, a top beam 3, a plurality of support columns 4 and four inclined beams 5; the top plate 1 and the bottom plate 2 are connected by a plurality of support columns 4 fixed, the top beam 3 is connected to the top plate 1, the top beam 3 is provided with a first optical fiber fixing part 31, and the four inclined beams 5 are evenly arranged at intervals of 90° along the circumferential direction of the top plate 1 or bottom plate 2, and respectively Connected with the top beam 3 and the bottom plate 2; the inclination angle between each of the slanting beams 5 and the bottom plate 1 is 45°, and each of the support columns 4 is perpendicular to the top...

Embodiment 2

[0047] Embodiment 2: In this embodiment, the torque sensor described in Embodiment 1 is mainly verified by the following experiments including sensitivity, linearity, measurement range, torque resolution, anti-interference performance and measurement accuracy and other indicators:

[0048] like Image 6 As shown, the experimental device used mainly includes: a three-axis linear fine-tuning mobile platform 14 that is provided with an ATI force sensor, an experimental platform 13 (comprising an XY mobile platform and an XYZ manual mobile platform) that loads the torque sensor described in Embodiment 1, a power supply 9, Data acquisition equipment (NI acquisition card 10), computer 8, fiber grating demodulator 7; Wherein: ATI force sensor is used for testing miniature torque sensor of the present invention, concrete experiment is as follows:

[0049] (1) Calibration experiment: the ATI force sensor is installed on the three-axis linear fine-tuning mobile platform 14, and the load...

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Abstract

The invention relates to a high-precision miniature torque sensor based on a fiber bragg grating, which comprises a torsion sensitive flexure structure, a fiber bragg grating and a signal processing unit, and is characterized in that the torsion sensitive flexure structure has a function of converting torsion motion into linear motion and can transmit axial displacement to an optical fiber; the fiber bragg grating is suspended on the central axis of the torsion sensitive flexure structure under the action of pretightening force, and when the torsion sensitive flexure structure rotates and generates axial displacement, the arrangement direction of the fiber is overlapped with the running direction of the linear displacement of the structure; the optical fiber can generate optical fiber strain signals which are more uniform, more sensitive and higher in linearity; the signal processing unit comprises a fiber bragg grating demodulator and a computer system and is used for converting optical signals into digital signals. The sensor disclosed by the invention has the characteristics of high sensitivity, large measurement range, high linearity, high measurement accuracy and the like.

Description

technical field [0001] The invention relates to the field of torque measurement, in particular to a high-precision miniature torque sensor based on an optical fiber Bragg grating. Background technique [0002] Accurate torque measurement has become an essential part of robotic systems. With the development and progress of various modern disciplines, the practical application range of torque measurement technology is very wide, and it spreads to various fields such as industry, agriculture, and medicine. Compared with other mechanical physical quantities, the measurement of torque is more complicated and difficult, but it is an important working parameter of various rotating power machinery. By measuring the torque of various mechanical equipment, it can not only become the mechanism of other physical phenomena, but also effectively Provide scientific data for the tested workpiece. [0003] Accurate collection of torque information at revolute joints has become essential an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L3/08
CPCG01L3/08
Inventor 史超阳赖德伟王树新
Owner TIANJIN UNIV
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