Anti-extreme environment sapphire fiber grating sensor and its temperature detection method
A fiber grating, sapphire crystal technology, applied in thermometers, thermometers, instruments, etc. with physical/chemical changes, can solve the problems of weak accident resistance, difficulty in achieving ideal results, large equipment size and cable volume, etc.
Active Publication Date: 2021-09-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0003] At present, in the nuclear radiation environment, the existing process parameters are measured using traditional electrical sensors, which have defects such as large equipment size and cable volume, weak anti-electromagnetic interference ability, weak accident resistance ability, etc. It is difficult to achieve ideal results in areas related to process parameter measurement
Although some studies have shown the possibility of applying femtosecond-written quartz fiber FBG sensors in nuclear radiation environments, the existing fiber sensor products have not yet formed products that are truly suitable for extremely harsh environments with high radiation, high temperature, high pressure, and strong vibration. Fully meet the needs of safety monitoring in extremely harsh environments
In addition, so far, there is no sapphire single-mode fiber product, and the existing sapphire crystal fiber grating sensors are all fused with multimode fiber and sapphire crystal fiber, and then the writing of the grating on the sapphire crystal fiber is completed.
This technology uses multimode as the transmission fiber to increase the complexity of demodulation
Method used
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[0016] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.
[0017] Such as figure 1 As shown, the sapphire crystal fiber grating temperature sensor includes a single-mode sensing fiber 1 , a sapphire crystal fiber grating 2 and a coating layer 3 . The production method is realized, and the specific steps are as follows:
[0018] A. Grinding one end of the sapphire crystal fiber to make the end face flat;
[0019] B. cutting the end face of the single-mode sensing fiber 2;
[0020] C. Splice the flattened section of the sapphire crystal fiber and the cut flat end face of the single-mode sensing fiber 2;
[0021] D. A fiber grating made by femtosecond laser point-to-point technology at the single-mode near-field position near the fusion point on the sapphire crystal fiber;
[0022] E. Coating materials ...
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The invention discloses a sapphire optical fiber grating sensor and its temperature detection method that are resistant to extreme environments. Aiming at the application problem of the temperature sensor under extremely harsh conditions, the invention welds a sapphire crystal optical fiber with a flat cross-section and a flattened single-mode optical fiber; It also includes grating on the single-mode near-field position near the fusion point on the sapphire crystal fiber, and coating the sapphire crystal fiber and the single-mode fiber with a protective material after the grating to obtain a sapphire crystal fiber grating temperature sensor; mode fiber, the mode selection of the light transmitted to the sapphire crystal fiber grating area is carried out through the single mode fiber, so that only few-mode or single-mode light enters the sapphire crystal fiber grating area; when the external temperature changes, the sapphire crystal fiber grating The effective refractive index and the period of the grating change, so that the central wavelength changes. By recording the central wavelength of the sapphire crystal fiber grating, the external temperature change is obtained through demodulation.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a sapphire crystal fiber grating temperature sensor resistant to extremely severe environments. Background technique [0002] For the measurement of process parameters in extremely harsh environments such as high radiation, high temperature, high pressure, and strong vibration, fiber optic sensors have emerged due to their outstanding advantages, such as natural insulation, not afraid of electromagnetic interference; simple structure, strong environmental tolerance; small size, Good flexibility, suitable for comprehensive layout of ships, can effectively reduce the space occupied by instruments; distributed layout can be used to improve the informatization and intelligence level of the measurement system. Therefore, fiber optic sensors have great potential advantages in the measurement of process parameters in extremely harsh environments. [0003] At present, in t...
Claims
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IPC IPC(8): G01K11/3206
CPCG01K11/3206
Inventor冉曾令李卓玥饶云江
OwnerUNIV OF ELECTRONICS SCI & TECH OF CHINA