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Ultra-wide-range fiber bragg grating displacement sensor and measuring method

A displacement sensor and fiber grating technology, applied in the field of optoelectronic measurement devices, can solve problems such as long-term stable measurement of unfavorable sensors, increase manufacturing difficulty and sensor volume, etc., and achieve the effect of being beneficial to popularization, reducing manufacturing difficulty, and improving accuracy.

Pending Publication Date: 2020-07-31
珠海任驰光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitation of the existing fiber grating displacement sensor structure and increasing the range will greatly increase the production difficulty and sensor volume, such as patent application number 201410209172. Increase the difficulty of production and the volume of the sensor, which is not conducive to the long-term stable measurement of the sensor

Method used

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  • Ultra-wide-range fiber bragg grating displacement sensor and measuring method
  • Ultra-wide-range fiber bragg grating displacement sensor and measuring method
  • Ultra-wide-range fiber bragg grating displacement sensor and measuring method

Examples

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Effect test

Embodiment 1

[0027] In the technical solutions disclosed in one or more embodiments, such as figure 1 and 2 As shown, an ultra-large range fiber grating displacement sensor includes a housing 18 and a winding device 1 arranged in the housing 18. The winding device 1 includes at least two wheel discs with different wheel diameters. The roulette and the small roulette, the rotating shafts of the two roulettes are connected so that the small roulette is linked when the big roulette rotates, the big roulette is wound and connected with the first pull rope 14, and the small roulette is wound and connected with the second pull rope 2, The second pull rope 2 is connected with the stress fiber grating 7 . The wire outlet end of the first pull cord 14 is used for connecting to a detection object or a detection point.

[0028] According to the ratio of the wheel diameters, the variation of the first stay cord 14 is proportionally reduced to the variation of the second stay cord 2 by arranging whee...

Embodiment 2

[0051] This embodiment provides a measurement method based on an ultra-large range fiber grating displacement sensor described in Embodiment 1, including the following steps:

[0052] S1 calibrates the wavelength λ of the temperature-compensated fiber grating W and the wavelength λ of the stress fiber grating B ;

[0053] S2 obtains the measured wavelength variation of the stress fiber grating 7 and the temperature compensation grating 8 in real time;

[0054] S3 calculates the temperature variation according to the wavelength variation of the temperature compensation grating 8;

[0055] S4 calculates the displacement S to be measured according to the temperature variation and the wavelength variation of the stress fiber grating 7 .

[0056] In this embodiment, based on the device structure of the embodiment, the displacement can be calculated relatively easily, and rapid measurement can be realized.

[0057] Optionally, in step 4, according to the temperature variation an...

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Abstract

The invention provides an ultra-wide-range fiber bragg grating displacement sensor and a measuring method. The sensor comprises a shell and a winding device arranged in the shell; the winding device at least comprises two wheel discs with different wheel diameters, namely a large wheel disc and a small wheel disc, rotating shafts of the two wheel discs are connected to enable the small wheel discto be in linkage when the large wheel disc rotates, the large wheel disc is connected with a first pull rope in a winding mode, the small wheel disc is connected with a second pull rope in a winding mode, and the second pull rope is connected with a stress fiber bragg grating. The displacement measurement distance is increased to the magnitude of dozens of meters by adopting the winding device with different radiuses. The large-range setting of the structural characteristics of the sensor is less limited by the size of the device, so the manufacturing difficulty of the device is reduced, and the popularization and use of the device are facilitated. The sensor and the method can be applied to real-time on-line monitoring of large-range displacement such as landslide, soft soil foundation settlement and structural health.

Description

technical field [0001] The present disclosure relates to the relevant technical field of optoelectronic measuring devices, and in particular, relates to an ultra-large-range optical fiber grating displacement sensor and a measuring method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Landslide refers to the effect that a certain part of rock and soil on the slope of the mountain moves toward the bottom of the slope as a whole under the action of gravity, including the gravity of the rock and soil itself and the dynamic and static pressure of groundwater, along a certain weak structural surface or structural belt. Phenomenon. Earthquakes, rainfall and snowmelt, surface water scour, immersion, rivers and other surface water bodies continuously scour the slope toe; unreasonable human engineering activities, such as excavation of the slo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01D5/353G01B9/02
CPCG01B9/02023G01B9/02031G01B11/02G01D5/35316
Inventor 崔洪亮程立耀于淼王忠民罗政纯杨先进杨先勇吴崇坚郑志丰杨悦张耀鲁
Owner 珠海任驰光电科技有限公司