Distributed deformation measurement apparatus and method, fiber grating inclination angle sensor, and fiber grating inclination angle sensor structure

Abstract

The invention discloses a distributed deformation measurement apparatus and method, a fiber grating inclination angle sensor, and a fiber grating inclination angle sensor structure. The fiber grating inclination angle sensor structure comprises a housing which is a hollow cylinder whose bottom end is open; a pair of constant-strength beams which are respectively disposed at opposite sides in the housing, wherein the opposite sides on the inner surfaces or the outer surfaces of the pair of constant-strength beams are provided with two fiber grating placement positions; and a weight which is arranged at the bottom of the housing and has two ends respectively fixed to the pair of constant-strength beams. According to the invention, since the fiber grating placement positions are arranged at the opposite sides, during deformation, one of the fiber grating placement positions is subjected to a positive strain effect and the other is subjected to a negative strain effect. Difference information of wavelength drift amounts of fiber gratings is taken as output signals, therefore, temperature errors in a detection process can be eliminated, and the detection precision of the fiber grating inclination angle sensor is improved.

Description

technical field [0001] The invention relates to the field of sensor detection, in particular to a distributed deformation measuring device and method, a fiber grating inclination sensor and a structure. Background technique [0002] The monitoring of inclination and deformation information at different heights or depths along the vertical direction is very important in engineering fields such as high-rise buildings, power towers, and high slopes. Through monitoring, their inclination, deformation and their changing trends can be grasped. In this measurement technology of inclination or deformation, traditional electric inclinometers are widely used. For example, in the deformation monitoring of slopes, workers drill holes in the vertical direction inside the slope and bury commercial inclinometer pipes. Put the electric inclinometer into the inclinometer tube, start from the bottom of the inclinometer tube, lift the electric inclinometer at intervals of equal heights, and re...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to reduce the detection error of measuring distributed deformation by using fiber grating and improve the detection accuracy

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