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Photonic crystal fiber grating temperature sensor based on liquid filling and manufacturing method thereof

A photonic crystal fiber and temperature sensor technology, which is applied in the field of fiber grating sensors, can solve the problems of low sensitivity of fiber grating temperature sensors and the small range of Bragg wavelength movement.

Inactive Publication Date: 2012-07-11
满文庆 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to overcome the problem that the sensitivity of the existing fiber grating temperature sensor is not high, the Bragg wavelength change of this fiber grating temperature sensor is mainly caused by the thermo-optic effect and thermal expansion effect of the fiber material, the range of the Bragg wavelength moving with the temperature change not big

Method used

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  • Photonic crystal fiber grating temperature sensor based on liquid filling and manufacturing method thereof
  • Photonic crystal fiber grating temperature sensor based on liquid filling and manufacturing method thereof
  • Photonic crystal fiber grating temperature sensor based on liquid filling and manufacturing method thereof

Examples

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Embodiment 1

[0038] A temperature sensor based on a liquid-filled photonic crystal fiber grating, including a photonic crystal fiber cladding 1, a germanium-doped fiber core 3 is arranged at the central axis of the fiber cladding 1, and a Bragg grating structure is engraved on the surface of the fiber core 3, Air holes 2 are penetrated axially along the fiber cladding 1, and these air holes 2 are uniformly distributed around the fiber core 3 and form a multi-layer matrix structure, and the air holes 2 are filled with a refractive index matching liquid with thermo-optic sensitive effect.

[0039] A PCF optical fiber cladding 1 with an outer diameter of 125 μm is used. The air holes in the cladding are arranged in a seven-layer matrix. The diameter of the air hole 2 is 1 μm, and the distance between the air holes is 1.55 μm. The fiber core 3 is made of germanium-doped photosensitive silica material, with a diameter of 2.1 μm, the refractive index of the germanium-doped silicon core is 1.45, a...

Embodiment example 2

[0047] Using the PCF and grating with the same structure as in Example 1, inject a thermo-photosensitive refractive index matching liquid, whose refractive index is 1.43 (at 25°C), and obtain a temperature sensitivity coefficient of 100pm / °C. In this case, the applied product is 25°C , 45°C, 65°C reflection spectra such as Figure 4 , When connected with an optical fiber sensor analyzer with a demodulation accuracy of 1pm, the sensor can achieve a temperature measurement sensitivity of 0.01°C.

Embodiment example 3

[0049] Optimally designed photonic crystal fiber structure, PCF fiber cladding 1 with an outer diameter of 125 μm, cladding air holes arranged in a 5-layer matrix, air hole 2 diameter 1.2 μm, air hole distance 1.6 μm, germanium-doped silica fiber core The refractive index is 1.46, and the air hole is filled with a thermo-optic sensitive refractive index matching liquid. Its refractive index is 1.43 (at 25°C), and the fiber grating can obtain a temperature sensitivity coefficient of 263pm / °C. In this case, the applied product is -15°C to 65°C ℃, the fiber grating wavelength shift changes as Figure 5 , when the sensor is connected with an optical fiber sensor analyzer with a demodulation accuracy of 1pm, the sensor can achieve a temperature measurement sensitivity of 0.004°C. When the demodulation device is used to demodulate the device with a resolution of 0.25pm, this product can increase the temperature measurement range from -15°C to 65°C, and the sensitivity can be increas...

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Abstract

The invention discloses a photonic crystal fiber grating temperature sensor based on liquid filling and a manufacturing method thereof. The photonic crystal fiber grating temperature sensor comprises a photonic crystal fiber cladding, wherein a germanium-doped fiber core is located at a center axis position in the fiber cladding; a Bragg grating structure is engraved on the surface of the fiber core; air vents are arranged along the axial direction of the fiber cladding and are distributed around the fiber core to form a multilayer matrix structure; and an index matching liquid with a thermal and light sensitive effect is filled in the air vents. The temperature sensitive property of the fiber Bragg grating temperature sensor is improved by filling the index matching liquid with the thermal and light sensitive effect into the air vents of the fiber cladding. By utilizing the photonic crystal fiber grating structure for filling liquid, the liquid thermal and light sensitive effect of a cladding area exists besides the liquid thermal and light sensitive effect and the heat expansion effect of a core area grating. The liquid thermal and light sensitive degree of the liquid is far better than that of a solid so that the photonic crystal fiber grating temperature sensor disclosed by the invention can obtain the thermal and light sensitive coefficient which are improved by 1-2 magnitude orders compared with that of the existing product.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensors, in particular to a high-sensitivity temperature sensor based on a liquid-filled photonic crystal optical fiber grating and a manufacturing method. Background technique [0002] 1) The fiber Bragg grating temperature sensor is a sensor characterized by wavelength coding. It measures the temperature change by measuring the movement of the Bragg reflection wavelength of the fiber Bragg grating. The measurement signal characteristics are not affected by factors such as light intensity, fiber bending and connection loss. This sensor has the advantages of being small and compact, free from electromagnetic interference, can realize simultaneous measurement of multiple nodes, and can be applied to various construction environments. [0003] 2) Most of the existing fiber grating temperature sensors are ordinary solid-clad fiber gratings, and very few use microstructured fibers (ie, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G02B6/02G01K11/3206
Inventor 满文庆彭军
Owner 满文庆
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