Fiber air pressure sensing device based on multiple Fabry-Perot micro cavities
A technology of air pressure sensing and microcavity, which is applied in the direction of fluid pressure measurement, measuring device, and fluid pressure measurement using optical methods, and can solve the problems of poor robustness of the sensor head of the optical fiber, low gas pressure sensitivity, and difficulty in maintenance. , to achieve the effect of low material price, large air pressure measurement range and simple production method
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[0018] Below in conjunction with accompanying drawing and embodiment example, the present invention will be further described:
[0019] figure 1 Shown is a schematic diagram of an implementation and application system of the present invention, including a broadband light source 1 , a circulator 2 , a sensor head 3 , and a spectrum analyzer 4 . The connection method is as follows: the circulator 2 has three interface ports, namely: the light source inlet port, the light source outlet port, and the feedback port. The inlet port is connected to the broadband light source 1 , the outlet port is connected to the connecting sensor head 3 , and the feedback port is connected to the spectrum analyzer 4 .
[0020] figure 2 Shown is a schematic structural view of the optical fiber sensing head 3 of the present invention, the sensing head 3 is composed of a single-mode optical fiber 5, a capillary thin layer 6, a spherical air cavity 7 and a capillary 8, and the single-mode optical fi...
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