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Temperature and refractive index dual-parameter sensor based on directional coupler and long-period fiber grating

A directional coupler and fiber grating technology, which is applied to thermometers, thermometers, instruments and other directions with physical/chemical changes, can solve problems such as extremely high precision requirements, and achieve the effect of simple device structure, compact device, and avoiding temperature crosstalk.

Inactive Publication Date: 2019-09-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such applications have extremely high requirements on the accuracy of refractive index measurement, so the measurement error introduced by temperature crosstalk becomes an important factor limiting the final detection accuracy

Method used

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  • Temperature and refractive index dual-parameter sensor based on directional coupler and long-period fiber grating
  • Temperature and refractive index dual-parameter sensor based on directional coupler and long-period fiber grating
  • Temperature and refractive index dual-parameter sensor based on directional coupler and long-period fiber grating

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Experimental program
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Effect test

Embodiment 1

[0025] combine figure 1 , Figure 2(a) and Figure 3(a), figure 1 It is a schematic diagram of a temperature and refractive index dual-parameter sensor based on a real dual-core fiber directional coupler and a long-period fiber grating; Figure 2 (a) is a structural diagram of a real dual-core fiber; Figure 3 (a) is written in a real Laser azimuth map when entering a long period fiber grating. A dual-parameter temperature and refractive index sensor based on a real dual-core optical fiber directional coupler and a long-period optical fiber grating is formed by sequentially connecting a light source, a single-mode optical fiber 4, a section of dual-core optical fiber 6, a single-mode optical fiber 5, and a detector. The two cores 1 and 2 of the dual-core optical fiber 6 are made of the same material and are both single-mode. The two cores 1 and 2 are symmetrically distributed about the fiber axis, and the distance between the cores is 15 microns. On the light source side, the co...

Embodiment 2

[0027] Combining Figure 2(b), Figure 3(b) and Figure 4 , Fig. 2(b) is the structure diagram of the hole-assisted dual-core fiber; Fig. 3(b) is the laser orientation diagram when the hole-assisted dual-core fiber is written into the long-period fiber grating; Figure 4 It is a schematic diagram of a temperature and refractive index dual-parameter sensor based on a hole-assisted dual-core fiber directional coupler and a long-period fiber grating. A dual-parameter sensor for temperature and refractive index based on a hole-assisted dual-core optical fiber directional coupler and a long-period fiber grating. The difference from Embodiment 1 is that the sensing unit is replaced by a dual-core optical fiber 6 with a large-diameter air hole. The hole assists the dual-core optical fiber 12. One core 11 of the hole-assisted dual-core optical fiber 12 is located at the center of the cladding 9 , and there is an air hole 10 in the fiber cladding 9 , and the other core 8 is located at t...

Embodiment 3

[0029] Combining Figure 2(b) and Figure 4 , Fig. 2(b) is a structure diagram of a hole-assisted dual-core optical fiber; Figure 4 It is a schematic diagram of a temperature and refractive index dual-parameter sensor based on a hole-assisted dual-core fiber directional coupler and a long-period fiber grating. A temperature and refractive index dual-parameter sensor based on a hole-assisted dual-core optical fiber directional coupler and a long-period fiber grating. The difference from Embodiment 2 is that the hole-assisted dual-core optical fiber 12 and the single-mode optical fiber 14 with a length of 31.5 mm Before performing the facing fusion splicing, a refractive index matching liquid with a refractive index of 1.35 may be injected into the air hole 10 of the hole-assisted dual-core optical fiber 12, and then fusion splicing is performed. The temperature sensitivity of the sensor will be improved.

[0030] In summary, the present invention provides a dual-parameter sen...

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Abstract

The invention relates to a temperature and refractive index dual-parameter sensor based on a directional coupler and a long-period fiber grating. The temperature and refractive index dual-parameter sensor belongs to the technical field of optical fiber sensing, and comprises a light source, single-mode optical fibers, a section of double-core optical fiber and a detector, wherein the same fiber core of the double-core optical fiber is aligned and welded with fiber cores of the single-mode optical fibers on both sides; the two fiber cores of the double-core optical fiber are made of the same material and are in a single mode respectively, a distance between the fiber cores is less than 20 micrometers, the two fiber cores satisfy a phase matching condition, the fiber core connecting the single-mode optical fibers on two ends is engraved with the long-period fiber grating, and the fiber core is a light-through fiber core; the two fiber cores can undergo energy coupling to form a directional coupler; and a resonance peak generated by the fiber grating drifts with changes of the external refractive index and temperature, and the change of a resonance peak of the directional coupler is only caused by the external temperature change, thereby achieving simultaneous measurement of the refractive index and temperature. The temperature and refractive index dual-parameter sensor is simple to manufacture, the device is small and easy to integrate, the two-parameter measurement can be simultaneously performed, the sensitivity is high, the temperature self-compensation capability is available, and the application prospect is broad.

Description

technical field [0001] The invention relates to a temperature and refraction index dual-parameter sensor based on a directional coupler and a long-period fiber grating, and belongs to the technical field of fiber optic sensing. Background technique [0002] The emergence of optical fiber sensing technology makes the new sensor use light as a sensitive information carrier, which has unique advantages such as optical measurement and optical signal transmission, and has high sensitivity, fast measurement, large information capacity, and strong adaptability (high temperature resistance, corrosion resistance, Anti-electromagnetic interference, etc.), suitable for integration and other advantages. Using optical wavelength division multiplexing, time division multiplexing and space division multiplexing technologies, one optical fiber can transmit multiple signals at the same time. Cooperating with computer technology and telemetry technology, it can also realize long-distance, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G01K11/32G01N21/41G01K11/3206
CPCG01D21/02G01K11/32G01N21/41
Inventor 关春颖蔚增禧杨菁史金辉朱正
Owner HARBIN ENG UNIV
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