Optical fiber Bragg grating temperature and stress two-parameter integrated sensing and demodulating system based on diffraction grating
A fiber Bragg and diffraction grating technology, applied in the direction of using optical devices to transmit sensing components, converting sensor outputs, measuring devices, etc., can solve the problem of high cost, inability to measure temperature and stress at the same time, and inability to have both static and dynamic spectral measurement functions. and other problems, to achieve the effects of good stability, small size, and improved demodulation accuracy
Pending Publication Date: 2022-03-01
SHANGHAI UNIV +1
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[0006] The purpose of the present invention is to provide a fiber Bragg grating temperature and stress dual-parameter integrated sensing and demodulation system based on a diffraction grating, to solve the problem of high cost in the prior art, the inability to have both static and dynamic spectrum measurement functions, and the inability to Simultaneous measurement of temperature and stress
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[0032] Below by in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
[0033] as attached Figure 1-2 Shown: a fiber Bragg grating temperature and stress dual-parameter integrated sensing and demodulation system based on a diffraction grating, including a photoelectric conversion device, a power drive module, a signal acquisition module and a signal demodulation module.
[0034] The photoelectric conversion device includes a broadband light source 1 with adjustable power, a first connecting fiber 2, a fiber circulator 3, a second connecting fiber 4, a 1*N-way coupler 5, a fiber Bragg grating 6, and a third connecting fiber 7 And photoelectric conversion module, described photoelectric conversion module comprises diffraction grating 8, mirror 9, photodiode array 10; Power adjustable broadband light source 1 is connected to No. 1 port of fiber optic circulator 3 through the first connecting optical fiber 2, optical fiber ...
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The invention discloses a fiber bragg grating temperature and stress two-parameter integrated sensing and demodulation system based on a diffraction grating, which belongs to the technical field of fiber optical measurement and comprises a photoelectric conversion device, a power supply driving module, a signal acquisition module and a signal demodulation module. The photoelectric conversion device comprises a broadband light source with adjustable power, an optical fiber circulator, 1 * N couplers, a fiber bragg grating and a photoelectric conversion module; the power supply driving module is used for supplying power to the photoelectric conversion module and realizing static and dynamic measurement functions by adjusting the power supply frequency; the signal acquisition module is used for acquiring an output signal of the photoelectric conversion module; the signal demodulation module is used for demodulating the collected signals, obtaining the central wavelength of each path of fiber Bragg grating, and obtaining the temperature and stress changes of different positions of the surface of the to-be-measured object in real time through the corresponding relation between the central wavelength and the temperature / strain. According to the invention, integrated measurement of temperature and stress can be realized, and static and dynamic spectrums can be measured.
Description
technical field [0001] The invention belongs to the technical field of fiber optical measurement, and specifically discloses a dual-parameter integrated sensing and demodulation system of fiber Bragg grating temperature and stress based on diffraction gratings. Background technique [0002] Temperature and stress are an important monitoring content in building structural health monitoring. By monitoring the temperature and stress during building construction and use, it can accurately reflect the stress, deformation and temperature of the building during construction and operation. , thermal expansion and other performance parameters, and through calculation can effectively evaluate the aging, damage location and degree of the building, comprehensively evaluate the structural health, reliability, durability and bearing capacity of the building, and provide a comprehensive evaluation for the building. Provide assessment basis for later maintenance, maintenance and management ...
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IPC IPC(8): G01D21/02G01D5/353
CPCG01D21/02G01D5/35316
Inventor 魏鹤鸣车嘉炜张登伟龚哲庞拂飞王廷云
Owner SHANGHAI UNIV