Fiber bragg grating (FBG) testing device and testing method for rock three-dimensional stress state
A technology of optical fiber grating and three-dimensional stress, which is applied in the direction of measuring the change force of its optical properties when the material is stressed, can solve the problems of not realizing the three-dimensional stress test, and achieve mine safety monitoring and prediction. Good for disasters, high test accuracy
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[0025] Such as figure 1 , figure 2 As shown, a testing device for a three-dimensional rock stress state of the present invention includes a data processing module composed of a fiber grating network demodulator and a computer, and a fiber grating sensing structure. The fiber grating sensing structure consists of three fiber grating sensors 21 , 22, 23 and the base for installing three fiber grating sensors 21, 22, 23. In this embodiment, the base is the cube module 1, and the three fiber grating sensors 21, 22, 23 are made of high-strength epoxy resin. The glue is pasted in the three-dimensional direction of the three adjacent surfaces of the cube module 1. The signal output ends of the three fiber grating sensors 21, 22, 23 are all connected to the signal input end of the fiber grating network demodulator, and the fiber grating network solution The signal output terminal of the instrument is connected to the signal input terminal of the computer through a data cable. The data...
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