Temperature compensation optical fiber grating steel bar corrosion sensor and temperature compensation method thereof
A fiber grating and steel bar corrosion technology, applied in thermometers, weather-resistant/light-resistant/corrosion-resistant, physical/chemically changed thermometers, etc., can solve the problems that cannot reflect the actual corrosion of steel bars, large disturbances in the corrosion environment of steel bars, and low measurement accuracy and other problems, to achieve the effect of strong anti-interference ability, simple and convenient embedding, and high measurement accuracy
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[0050] The temperature self-compensating fiber grating steel bar corrosion sensor of this embodiment includes a fiber grating temperature compensation method and a fiber grating steel bar corrosion sensor;
[0051] Among them, the fiber grating temperature compensation method uses two fiber gratings arranged on the upper surface of the cantilever beam of the fiber grating steel corrosion sensor, such as figure 1 shown. Fiber Bragg Grating S 1 The distance from the center of the probe is L 1 , fiber grating S 2 The distance from the center of the probe is L 2 , L 1 and L 2 are less than the total length L of the cantilever beam, and L 1 and L 2 not equal.
[0052] According to the mode coupling theory, the relationship between the central wavelength of the FBG, the effective refractive index of the FBG core and the grating pitch of the FBG is:
[0053] λ=2n eff ·Λ (1)
[0054] Among them, λ is the central wavelength of the fiber grating; n eff is the effective refra...
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