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Optical fiber grating acceleration and strain sensor and detection method

A strain sensor and fiber grating technology, which is used in the detection of the acceleration or strain of the measured object, and the field of fiber grating acceleration and strain sensors can solve the problems of inability to achieve temperature compensation and large errors in measurement results.

Active Publication Date: 2019-03-29
BENGBU COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Fiber Bragg Grating has many advantages that other sensors can't match: all-optical measurement, no electrical equipment at the monitoring site, free from electromagnetic and nuclear radiation interference; zero drift, long-term stability; the center wavelength of reflected light is used to characterize the measured object, not affected by the light source Influenced by factors such as power fluctuations, fiber micro-bending effects, and coupling loss; absolute measurement, no calibration is required during system installation and long-term use; Strain sensors, but the existing technology rarely measures object acceleration and strain sensors at the same time, and cannot achieve accurate temperature compensation, resulting in large errors in measurement results

Method used

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  • Optical fiber grating acceleration and strain sensor and detection method
  • Optical fiber grating acceleration and strain sensor and detection method
  • Optical fiber grating acceleration and strain sensor and detection method

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Embodiment 1

[0038] Such as Figures 1 to 2 shown.

[0039] The fiber grating acceleration and strain sensor includes two side brackets, a metal rotating arm 4 and a fiber grating 5 .

[0040] The brackets on both sides are the first bracket 1 and the second bracket 2 respectively, and the lower end of the first bracket 1 and the lower end of the second bracket 2 are welded to the metal object 9 to be measured (the fixing of the first bracket 1 and the second bracket 2 to the object 9 to be measured The method is not limited to welding and fixing, the first support 1 and the second support 2 are respectively fixed on the measured object 9 by bolts or other fastening methods can also achieve the same inventive effect), the right end of the metal rotating arm 4 is connected to the first support 1. The upper part is hinged by a pin shaft. The pin shaft is set horizontally. The left end of the metal rotating arm 4 is fixed to the right end of the fiber grating 5. The right end of the fiber gr...

Embodiment 2 9

[0057] The difference between the following embodiment and the first embodiment is only that the metal rotating arm adopts different metal materials, the length L=20mm of the optical fiber grating, and the thermal expansion coefficient α of the optical fiber grating FBG =5.5×10 -7 / °C, when the ambient temperature changes, it can also make the fiber grating acceleration and strain sensor have the technical effect of self-temperature compensation, please refer to the following table for details:

[0058]

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Abstract

The invention provides an optical fiber grating acceleration and strain sensor. The sensor comprises two side supports, a metal rotating arm, and an optical fiber grating. The two side supports are fixed to a detected object. Two ends of the optical fiber grating are fixed to the metal rotating arm and one support respectively. The metal rotating arm is hinged to the other support. The rotating arm elongates to compensate changes in the fiber grating wavelength caused by ambient temperatures when the ambient temperatures change. The sensor can distinguish corresponding changes according to different frequencies of changes caused by strain and vibration, and can measure the acceleration and strain conditions of the detected object. The invention further provides a method for detecting the acceleration or the strain of the detected object by utilizing the sensor. The method comprises the following steps of: connecting one end of the optical fiber grating with a fiber grating demodulatorand an external controller; judging as the change caused by the acceleration of the detected object when the wavelength change frequency is greater than 0.1Hz; and judging as the strain when the wavelength change frequency is less than 0.1Hz, and calculating the strain or acceleration information of the detected object according to the amount of wavelength change.

Description

technical field [0001] The invention relates to an optical fiber sensor, especially an optical fiber grating acceleration and strain sensor with temperature compensation. [0002] The invention also relates to a method for detecting the acceleration or strain of the measured object by using the fiber grating acceleration and strain sensor. Background technique [0003] Fiber Bragg Grating has many advantages that other sensors can't match: all-optical measurement, no electrical equipment at the monitoring site, free from electromagnetic and nuclear radiation interference; zero drift, long-term stability; the center wavelength of reflected light is used to characterize the measured object, not affected by the light source Influenced by factors such as power fluctuations, fiber micro-bending effects, and coupling loss; absolute measurement, no calibration is required during system installation and long-term use; Strain sensors, but in the prior art there are few sensors that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/03G01B11/16
CPCG01B11/16G01P15/03
Inventor 李瑜庆李阔田娟乔爱民刘国永
Owner BENGBU COLLEGE