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A Fiber Bragg Grating Hydraulic Subsidence Instrument, System and Method Based on Compensating Pressure Difference Method

A fiber grating, pressure difference compensation technology, applied in the field of sensors, can solve problems such as affecting the construction of the overall infrastructure, inability to apply high pressure difference, etc., to achieve the effect of reducing the cost of manual inspection

Active Publication Date: 2022-03-29
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 inventor found that the general hydraulic settlement instrument requires the elevation of the measuring point to be basically the same as the elevation of the observation room located on the downstream slope of the dam or large-scale infrastructure, while the elevation of the top of the dam foundation or the base covering layer is usually below the dead water level of the downstream channel, so Ordinary hydraulic settlement instruments are not suitable for high pressure difference and high precision settlement measurement
[0004] At present, many electromagnetic settlement instruments are used in the market. The installation of this settlement instrument needs to lead the settlement pipe vertically from the dam foundation or the base to the top, which seriously affects the construction of the overall infrastructure facilities.

Method used

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  • A Fiber Bragg Grating Hydraulic Subsidence Instrument, System and Method Based on Compensating Pressure Difference Method
  • A Fiber Bragg Grating Hydraulic Subsidence Instrument, System and Method Based on Compensating Pressure Difference Method
  • A Fiber Bragg Grating Hydraulic Subsidence Instrument, System and Method Based on Compensating Pressure Difference Method

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Embodiment 1

[0035] This embodiment provides a fiber grating hydraulic subsidence instrument based on the compensation pressure difference method, such as figure 1 As shown, it includes a water tank 6, a pressure compensation device, and a water level pressure measurement device, wherein the pressure compensation device is arranged inside the water tank 6, and the water level pressure measurement device is located below the water tank 6.

[0036] Specifically, the water tank 6 is a sealed structure for providing water required for water level pressure measurement, and it can be square, cylindrical or other shapes, which are selected according to actual requirements. The top of the water tank 6 offers an exhaust port 11 for exhausting during the water injection process.

[0037] One side of the water tank 6 is connected to the water inlet pipe 12 , and the other side is connected to the water outlet pipe 13 ; the water inlet pipe 12 and the water outlet pipe 13 are symmetrically installed w...

Embodiment 2

[0075] This embodiment provides a fiber Bragg grating hydraulic subsidence instrument based on the compensation pressure difference method, and the structure of the subsidence instrument is the same as that in the first embodiment. The stress diaphragm 2 is metal beryllium copper, the thickness of the metal beryllium copper film is 0.01mm, the radius is 15mm, the radius of the hard core in the center is 1.5mm, and the elastic modulus of metal beryllium copper is 1.31×10 11 N / m 2 , the Poisson's ratio is 0.2; the optical fiber 15 is a single-mode optical fiber, the central wavelength value of the fiber grating stress sensor 3 is 1535.003nm, the optical fiber length is 20mm, the diameter is 0.125um, and the elastic modulus is 74×10 11 N / m 2 , the effective elastic-optic coefficient is 0.23, the water level difference at the measurement point of the calibration water level of the settlement system is 124.83m, and the full-scale measurement range of the water level gauge is 2m. ...

Embodiment 3

[0089] This embodiment provides a fiber Bragg grating hydraulic settlement system based on the compensation pressure difference method, including a laser generator, a laser signal processing device, and the settlement instrument described in Embodiment 1, wherein one end of the optical fiber of the settlement instrument passing through the casing is connected to the laser The generating device and the laser signal processing equipment, the laser signal processing equipment can obtain the settlement measurement information at the settlement instrument according to the change of the laser wavelength.

[0090] The laser generating device is a laser generator, and the laser signal processing equipment is an existing laser signal processing module, which will not be repeated here.

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Abstract

The invention discloses an optical fiber grating hydraulic subsidence instrument, system and method based on the compensation pressure difference method, and its technical solution is: comprising a water tank, a pressure compensation device and a water level pressure measuring device, and the water tank is used to provide water required for water level pressure measurement; The pressure compensation device is set inside the water tank for pressure compensation of the water level measurement; the external force can be applied to it during the measurement process of the water level pressure measurement device; the water level pressure measurement device is set under the water tank, including the stress connected to the pressure compensation device A diaphragm, the stress diaphragm is connected to an optical fiber, and a plurality of fiber grating sensors are fixed at intervals on the optical fiber. The invention uses external force to partially offset the stress received by the stress membrane, so that the settlement instrument can adapt to high-pressure differential water level and maintain high-precision settlement measurement; and can monitor the settlement in real time at a long distance.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an optical fiber grating hydraulic subsidence instrument, system and method based on a differential pressure compensation method. Background technique [0002] In today's market, with the development of water conservancy and hydropower projects and various large-scale projects, more and more dam foundations and civil works have to be excavated to the bedrock layer to be directly built on the overburden layer, and the dam foundation or civil works will be subsidence and deformed. The size of the dam has a great influence on the stress and deformation of the dam. Therefore, for dams and large-scale infrastructure projects built on the overburden, the settlement monitoring of the base is one of the most important safety monitoring items for these dams and large-scale infrastructure facilities. The water level difference between the reference level of the entire subsidence measureme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C5/00
CPCG01C5/00
Inventor 崔洪亮于淼罗政纯常天英程立耀吴崇坚杨先进杨先勇
Owner 珠海任驰光电科技有限公司