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A liquid-filled D-type hollow-core double-clad optical fiber SPR temperature sensor

A double-clad optical fiber and temperature sensor technology, which is applied to thermometers, thermometers, instruments, etc. that change physically/chemically, can solve the problems of large connections and complicated manufacturing processes, and achieve high temperature sensitivity, small size, and simple manufacturing. Effect

Inactive Publication Date: 2019-01-22
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The fiber-optic SPR temperature sensor based on photonic crystal fiber can have different temperature sensitivities according to the different materials filled, but there are big problems in its connection with ordinary optical fibers, and the manufacturing process is relatively complicated

Method used

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  • A liquid-filled D-type hollow-core double-clad optical fiber SPR temperature sensor

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Embodiment approach 1

[0013] A liquid-filled D-type hollow-core double-clad fiber SPR temperature sensor includes a D-type hollow-core double-clad fiber with a length of 1 cm, which is a light transmission carrier and a temperature sensing area, mainly including optical fiber cores 1-1, The inner cladding 1-2 and the outer cladding 1-3, wherein the distance 2 between the D-shaped hollow core region 3 and the fiber core 1-1 is 5.5 microns. The metal film 4 is coated on the inner wall of the D-shaped hollow area 3 and filled with a liquid material with a high thermo-optic coefficient. D-type hollow-core double-clad fiber is a double-clad fiber made according to requirements. The radius of the fiber core 1-1 is 5 microns, the radius of the inner cladding 1-2 is 25 microns, and the radius of the outer cladding 1-3 is 62.5 Micron; the refractive index of each layer is high-low-lower step distribution. Because the D-shaped hollow core region 3 is filled with a liquid material with a high thermo-optic co...

Embodiment approach 2

[0015] A liquid-filled D-type hollow-core double-clad fiber SPR temperature sensor includes a D-type hollow-core double-clad fiber with a length of 0.75 cm, which is a light transmission carrier and a temperature sensing area, mainly including fiber cores 1-1, The inner cladding 1-2 and the outer cladding 1-3, wherein the distance 2 between the D-shaped hollow core region 3 and the fiber core 1-1 is 5.5 microns. The metal film 4 is coated on the inner wall of the D-shaped hollow area 3 and filled with a liquid material with a high thermo-optic coefficient. D-type hollow-core double-clad fiber is a double-clad fiber made according to requirements. The radius of the fiber core 1-1 is 5 microns, the radius of the inner cladding 1-2 is 25 microns, and the radius of the outer cladding 1-3 is 62.5 Micron; the refractive index of each layer is high-low-lower step distribution. Because the D-shaped hollow core region 3 is filled with a liquid material with a high thermo-optic coeffic...

Embodiment approach 3

[0017] A liquid-filled D-type hollow-core double-clad fiber SPR temperature sensor includes a D-type hollow-core double-clad fiber with a length of 0.5 cm, which is a light transmission carrier and a temperature sensing area, mainly including optical fiber cores 1-1, The inner cladding 1-2 and the outer cladding 1-3, wherein the distance 2 between the D-shaped hollow core region 3 and the fiber core 1-1 is 5.25 microns. The metal film 4 is coated on the inner wall of the D-shaped hollow area 3 and filled with a liquid material with a high thermo-optic coefficient. D-type hollow-core double-clad fiber is a double-clad fiber made according to requirements. The radius of the fiber core 1-1 is 5 microns, the radius of the inner cladding 1-2 is 25 microns, and the radius of the outer cladding 1-3 is 62.5 The refractive index of each micron layer is high-low-lower step distribution. Because the D-shaped hollow core region 3 is filled with a liquid material with a high thermo-optic ...

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Abstract

A double-clad SPR temperature sensor relates to a liquid-filled D-type hollow-core double-clad optical fiber SPR temperature sensor, which belongs to the field of optical communication and optical fiber devices, and is an expansion of the SPR-based optical fiber temperature sensor, and its principle is simple , high sensitivity, small structure, light weight, relatively simple, flexible and low cost in manufacturing process, suitable for temperature detection in various environments. The liquid-filled D-type hollow-core double-clad fiber SPR temperature sensor is coated with a metal film (4) on the inner wall of the D-type hollow core area (3) of the special D-type hollow-core double-clad fiber, and filled with high-temperature light coefficient of the liquid material. Using the thermo-optic effect of the filled liquid material, when the external temperature changes, its refractive index will change greatly, resulting in a large shift and change of the corresponding SPR loss spectrum, so as to achieve the purpose of high-sensitivity temperature measurement.

Description

technical field [0001] The invention relates to a liquid-filled D-type hollow-core double-clad optical fiber SPR temperature sensor, which belongs to the field of optical communication and optical fiber devices, and is an expansion of the SPR-based optical fiber temperature sensor. It has small structure, simple principle and high sensitivity. Suitable for temperature detection in various environments. Background technique [0002] From the use of fiber gratings for temperature sensing to fiber optic F-P cavity temperature sensors, so far, temperature sensors based on fiber optics have emerged in an endless stream. Due to the sensitivity of Surface Plasmon Resonance (SPR) to the outside world, SPR-based temperature sensors have also appeared on the sensor research agenda. SPR is an electromagnetic phenomenon that occurs at the junction of the metal film and the medium through the coupling of the fiber core mode and the metal surface plasmon polarization (SPP) mode. It gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 翁思俊裴丽王建帅王一群李月琴
Owner BEIJING JIAOTONG UNIV
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