Optical fiber humidity sensor based on coarse cone, working principle thereof and preparation method thereof

A humidity sensor and optical fiber technology, which is applied to the optical fiber humidity sensor based on thick cone and its working principle and preparation field, can solve the problems of complex production and low sensitivity, achieve a small sensor structure, improve coupling efficiency, and solve the problem of temperature and humidity cross sensitivity. Effect

Active Publication Date: 2020-05-29
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to propose a simple, effective, high-sensitivity reflective humidity sensor based on thick cones and photonic crystal fibers for the problems of complex fabrication, low sensitivity, and temperature-humidity cross-sensitivity existing in existing optical fiber humidity sensors. , specifically a thick cone-based optical fiber humidity sensor and its working principle and preparation method

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  • Optical fiber humidity sensor based on coarse cone, working principle thereof and preparation method thereof
  • Optical fiber humidity sensor based on coarse cone, working principle thereof and preparation method thereof
  • Optical fiber humidity sensor based on coarse cone, working principle thereof and preparation method thereof

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Embodiment 1

[0051] The preparation method of the optical fiber humidity sensor based on thick cone in the present embodiment, comprises the following steps:

[0052] (1) Before welding, the end faces of ordinary single-mode fiber 1 and photonic crystal fiber 2 need to be cut flat and wiped clean with alcohol.

[0053] (2) Optical fiber thick cone fusion. Put the prepared optical fiber on the jig of the fusion splicer. In order to improve the splicing quality, fine-tune the X and Y directions of the jig to align the two optical fibers. The fusion splicing intensity is set to 130-140mA, the pre-melting time is set to 1400-1500ms, the advancing distance is set to 15-20μm, and the photonic crystal fiber is placed 5-10μm away from the electrode. The stomata are collapsed to obtain a more ideal interference spectrum.

[0054] (3) After the fusion splicing is completed, the end face of the photonic crystal fiber is accurately cut under the fiber cutter, and the length of the photonic crystal f...

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Abstract

The invention discloses an optical fiber humidity sensor based on a coarse cone and a working principle thereof and a preparation method thereof. A single-mode optical fiber and a photonic crystal fiber are welded, a melting point is fused into the coarse cone, and the coarse cone and the photonic crystal fiber form an online Michelson optical fiber interferometer. Air holes of the photonic crystal fiber are all exposed in the environment, which is more conducive to the cause of the fiber to induce moisture. The change of the ambient humidity causes the change of a high-order mode propagationconstant in the photonic crystal fiber, an intermode interference spectrum is modulated, and the information of the ambient humidity can be obtained by detecting a reflected intermode interference spectrum. The humidity sensor has the advantages of being high in sensitivity, accurate in measurement, good in stability, resistant to electromagnetic interference and the like.

Description

technical field [0001] The invention relates to the field of optical fiber humidity sensing, in particular to a thick cone-based optical fiber humidity sensor and its working principle and preparation method. Background technique [0002] Humidity is a physical quantity used to characterize the dryness of the atmosphere, generally expressed by relative humidity (%RH), which represents the ratio of the gas pressure of water vapor in the atmosphere to the pressure of saturated water vapor. Relative humidity is a very important monitoring physical quantity in many fields such as agricultural production, material storage, environmental meteorology and building safety. Traditional electrical humidity sensors occupy the main market due to their advantages of high reliability, simple structure, low cost and low maintenance rate. However, there are disadvantages such as poor stability, susceptibility to electromagnetic interference, and poor corrosion resistance, which make it impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41
CPCG01N21/412Y02A90/10
Inventor 邵敏孙浩男韩亮梁俊俊张蓉冯德全
Owner XI'AN PETROLEUM UNIVERSITY
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