Calibration method of fiber grating water-soil interface sensor probe

Abstract

The invention discloses a calibration device and a calibration method of a fiber bragg grating water-soil boundary sensing probe. The calibration device comprises a water pressure calibration device and a water-soil pressure calibration device, wherein the water pressure calibration device comprises a first transparent water tank, a first ruler, a first sensing probe and a support; the first transparent water tank is of a U-shaped structure; a first hole is formed in the bottom of the first transparent water tank; the first ruler is vertically arranged on an inner wall on one side of the first transparent water tank; the first sensing probe is embedded into the first hole in the bottom of the first transparent water tank; the support is arranged on two sides at the outer end of the bottom of the first transparent water tank; the water-soil pressure calibration device comprises a second transparent water tank, a second ruler, a second sensing probe and a partition plate; the second transparent water tank is of a U-shaped structure; the second ruler is vertically arranged on an inner wall on one side of the second transparent water tank; the partition plate is vertically arranged inside the second transparent water tank; a second hole is formed in the partition plate; and the second sensing probe is embedded into the second hole. The calibration device is simple in structure and capable of calibrating precisely.

Description

technical field [0001] The invention relates to a water conservancy project monitoring device, in particular to a calibration device and a calibration method for an optical fiber grating water-soil interface sensing probe. Background technique [0002] The calibration of the sensor probe is to use a standard device to generate a known non-electric quantity (such as standard force, displacement, etc.) as an input to the sensor probe to be calibrated to obtain the output of the sensor, and then the Inputs are related to outputs. The calibration of the sensing probe in the engineering test should be carried out in an environment similar to its use conditions to obtain higher accuracy. [0003] The working principle of the optical fiber grating water-soil interface sensing probe of the present invention is to measure the lateral earth pressure at a certain depth underwater, and then determine whether the depth is in water or soil. If the lateral earth pressure at several diffe...

AI Technical Summary

Problems solved by technology

Such a calibration method is easily affected by the error of the resistance strain gauge itself, and can only make a theoretical relationship between the central wavelength of the sensor probe FBG and the strain, and cannot simulate the sensor probe in the actual erosion environment.

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