Fiber grating arch bridge-shaped pressure sensor

A pressure sensor and fiber grating technology, applied in the field of sensors, can solve problems such as low precision and failure

Inactive Publication Date: 2012-07-25
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Sensor technology is a key technology of modern science and technology. Existing sensors mostly use electric sensors to measure stress, which are prone to problems such as low accuracy and failure due to external interference (especially the influence of water).

Method used

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  • Fiber grating arch bridge-shaped pressure sensor
  • Fiber grating arch bridge-shaped pressure sensor
  • Fiber grating arch bridge-shaped pressure sensor

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with specific embodiments.

[0019] 1. Sensor structure

[0020] The specific structure of the sensor of the present invention is as follows: image 3 , 4 shown. It includes a cuboid combined type (divided into upper and lower parts, and the upper and lower parts are movably connected) metal box 20 , high-strength steel sheet 10 , steel wire 50 and optical fiber grating 30 . The high-strength steel sheet 10 is folded into an arch bridge, the steel wire 50 is pulled in the middle of the arch bridge, and the fiber grating 30 is pasted on the steel wire 50 at the same time. One end 101 of the arch bridge is fixed at the bottom of the metal box, and the other end is a movable end 102 . The movable end 102 is in contact with the bottom of the metal box 20, and there is a groove 40 with a small slope at the contact point, so that there is sufficient room for movement. The upper and lower parts of the ...

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Abstract

The invention discloses a fiber grating arch bridge-shaped pressure sensor. The fiber grating arch bridge-shaped pressure sensor comprises a combined metal box, an arch bridge-shaped elastic device, a metal wire and a fiber grating; two ends of the metal wire are connected with a middle part of the arch bridge-shaped elastic device, and the fiber grating is adhered on the metal wire; the combinedmetal box comprises an upper part and a lower part, the upper part and the lower part can move relatively in longitudinally direction, when the upper part of the combined metal box bears pressure, the pressure wholly acts on the upper part of the arch bridge-shaped elastic device, and one end of the arch bridge-shaped elastic device is fixed at the bottom of the metal box while the other end thereof is a movable end. The pressure sensor based on fiber sensing is formed through the fiber grating sensing technology, and high-accuracy measurement on perpendicular stress is implemented.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a fiber grating arch bridge pressure sensor. Background technique [0002] Sensor technology is a key technology of modern science and technology. Existing sensors mostly use electric sensors to measure stress, which are prone to problems such as low accuracy and failure due to external interference (especially the influence of water). [0003] Fiber Bragg grating is a new kind of reflective filter passive sensitive element with wide application prospect and excellent performance in the world since the 1990s. It realizes on-line measurement of structures by sensing external micro-strain changes through the movement of Bragg grating reflection wavelength. The basic principle is: when the light wave in the fiber passes through the grating, the light that satisfies the wavelength condition of the grating is reflected back and becomes reflected light, and the rest of the light become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24
Inventor 魏世明柴敬许力
Owner HENAN POLYTECHNIC UNIV
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