Intrinsic Fabry-Perot stress sensor based on optical fiber pyrometric cone and manufacturing method thereof
A technology of stress sensor and manufacturing method, which is applied in the field of optical fiber devices, can solve the problems of difficult improvement of optical fiber sensitivity, difficult processing control, large temperature drift, etc., achieve wide response speed and reliability, and improve the effect of sensing sensitivity
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Embodiment 1
[0034] In this example, see figure 1 , a method of manufacturing an intrinsic type Fabry-Perot stress sensor based on an optical fiber fusion cone, comprising the steps of:
[0035] 1) Preparation process of optical fiber fusion cone:
[0036] Before drawing the optical fiber, cut the optical fiber with a set length, peel off the coating layer with a length of no more than 2cm in the middle of the optical fiber, and wipe it clean with absolute ethanol as a pre-drawn optical fiber; then place the pre-drawn optical fiber on the optical fiber fixture In the process, the optical fiber stripped of the coating layer is placed in the middle of the optical fiber clamp, and a section of ordinary single-mode optical fiber parallel to the pre-drawn optical fiber is placed in the clamps on both sides to fix the pre-drawn optical fiber; then the drawing speed and drawing speed are controlled by the program The length and hydrogen flow parameters are obtained by heating, melting and drawin...
Embodiment 2
[0047] This embodiment is basically the same as Embodiment 1, especially in that:
[0048] In this example, see figure 2 with image 3 , the manufacturing method of the intrinsic type Fabry-Perot stress sensor based on the optical fiber fusion cone, the single-mode optical fiber intrinsic type Fabry-Perot stress sensor with the cavity length of 200 μm and 400 μm is prepared, and then measured, the stress Change from 0N to 1N, collect data every 0.1N, and get the change of reflection spectrum. With the increase of the stress at both ends of the sensing device, the overall reflectance spectrum shifts to the long wavelength direction. The manufacturing method of the intrinsic type Fabry-Perot stress sensor based on the optical fiber fusion cone, the single-mode optical fiber intrinsic type Fabry-Perot stress sensor with a cavity length of 600 μm is prepared, and the valley value near 1551nm is selected for monitoring , the change curve of the wavelength with the stress at bot...
Embodiment 3
[0050] This embodiment is basically the same as the previous embodiment, and the special features are:
[0051] In this example, see Figure 5 with Image 6 , based on the manufacturing method of the intrinsic type Fabry-Perot stress sensor based on the optical fiber fusion cone, the intrinsic type Fabry-Perot device with the waist diameter of the cone is 61 μm and the cavity length is 200 μm and 400 μm respectively , to monitor the variation of trough wavelength with stress near 1565nm and 1574nm. When the diameter of the fiber is reduced, under the same external stress, the reflection spectrum of the fiber fusion cone intrinsic type Fabry-Perot stress sensor has a larger shift than that of the traditional single-mode fiber intrinsic type Fabry-Perot stress sensor. want more. Through calculation, we can get that when the interference wavelength of the sensor is 200μm and 400μm, its stress sensitivity is 6.669nm / N and 5.984nm / N respectively.
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Abstract
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