Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature
A technology of temperature sensor and optical fiber grating, which is applied in the design field of bimetallic optical fiber grating temperature-enhancing sensor, and can solve the problems of limited range of high-sensitivity optical fiber grating temperature sensor
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example 1
[0030] Example 1: In an environment of 20°C, make a sensor with an initial working temperature of 120°C. The sensor should be composed of the following parts: a fiber grating, aluminum with a large thermal expansion coefficient (α=22*10 -6 / K) base, small coefficient of thermal expansion invar (α=0.5*10 -6 / K) strip, where a strip hole, a set screw and a nut are made on the invar strip. according to figure 2 with image 3 In the way shown, first fix the aluminum base and the invar strip together with screws and nuts. Then use epoxy glue to paste the two ends of the fiber grating to the aluminum base and the end points of the invar strip respectively. Then, you can determine d by moving the invar bar, and choose different Δd according to different Ts.
[0031] Might as well set L=500mm, d=15mm. At this time, the pre-loose length of the fiber grating should be:
[0032] Δd=[α 2 L-α 1 (L-d)](Ts-Tr)≈1.05mm
[0033] The temperature sensitivity of the sensor is:
[0034]...
example 2
[0036] Example 2: In an environment of 20°C, make a sensor with an initial working temperature of -80°C. The sensor is mainly composed of the following parts: a fiber grating, an invar base with a small thermal expansion coefficient, a long aluminum strip with a large thermal expansion coefficient, and a long hole, a fixing screw and a nut are made on the aluminum strip. according to figure 2 with image 3In the way shown, the invar base and the aluminum bar are first fixed together with screws and nuts. Then use epoxy glue to paste the two ends of the fiber grating to the invar base and the ends of the aluminum bar respectively. Then, d can be determined by moving the aluminum strip, and different Δd can be selected according to different Ts.
[0037] Might as well set L=500mm, d=15mm. At this time, the pre-loose length of the fiber grating should be:
[0038] Δd=[α 2 L-α 1 (L-d)](Ts-Tr)≈1.04mm,
[0039] The temperature sensitivity of the sensor is:
[0040] Δλ B / ...
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