Blazed fiber bragg grating demodulation-based micro-displacement sensor and detection method
A blazed fiber grating and micro-displacement sensor technology, which is applied in light demodulation, optics, instruments, etc., can solve the problems that strain signal and temperature signal cannot be separated and detected, fiber grating sensor is cross-sensitive, and the system stability is not high. Achieve the effect of solving the problem of cross-sensitivity, low cost, and simple instrument structure
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[0017] The specific structure, principle and measurement process of the present invention will be further explained below in conjunction with the drawings.
[0018] figure 1 It is a schematic diagram of the overall principle structure of the micro-displacement sensor based on blazed fiber grating demodulation provided by the present invention. The light emitted by the broadband light source is sent to the sensing fiber grating through the fiber circulator, and the fiber grating is pasted between one end of the double arched beam and the center point. The measured micro-displacement is provided by the spiral micrometer screw. When the micro-displacement is applied to the upper surface of the double-arched beam, the beam will be deformed, so that the fiber grating pasted on it will be strained. The reflection spectrum signal of the fiber grating for sensing is modulated by micro-displacement and reflected, and then sent to the demodulation blazed fiber grating through the fiber ci...
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