Single-end reflective long-period fiber grating sensor and manufacture process thereof

A fiber grating and manufacturing process technology, applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of expensive and bulky instruments, inconvenient monitoring of transmission-type long-period fiber gratings, etc., and achieve high sensing sensitivity , easy adhesion and adhesion, simple coating process

Active Publication Date: 2016-09-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of inconvenient monitoring of existing transmission-type long-period fiber gratings and expensive and bulky instruments, the present invention proposes a single-end reflective long-period fiber grating sensor and its manufacturing process

Method used

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  • Single-end reflective long-period fiber grating sensor and manufacture process thereof
  • Single-end reflective long-period fiber grating sensor and manufacture process thereof
  • Single-end reflective long-period fiber grating sensor and manufacture process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] combine Figure 1-2 , a long-period fiber grating sensor based on single-end reflection, including long-period fiber grating segment 1, fiber segment 2 and tail end segment 3, from left to right are long-period fiber grating segment 1, fiber segment 2 and tail end Section 3, the length of the fiber grating section 1 is 4-6cm, the length of the fiber section 2 is 1-2cm, and the length of the tail end section 3 is 1-6cm.

[0040] The fiber grating segment 1 is sequentially composed of fiber grating segment core 4 and fiber grating segment metal film 7 from the inside to the outside. A layer of fiber grating segment metal film 7 is arranged on the surface of the long period fiber grating segment 1. On the surface of the tail end segment 3 There is a layer of end-section metal film 8, and a layer of end-section metal film 9 is provided on the end surface of the end-end section 3. The end-end section 3 is followed by the end-section fiber core 6 and the end-end section metal...

Embodiment 2

[0049] This embodiment is similar to Embodiment 1, wherein the fiber grating segment 1 of the sensor has a length of 4 cm, the fiber segment 2 has a length of 1 cm, and the tail end segment 3 has a length of 1 cm. The metal film 7 of the fiber grating segment has a thickness of 50 nm, and the metal film 8 of the tail end segment and the metal film 9 of the end face of the tail end segment have a thickness of 700 nm.

[0050] A manufacturing process based on a single-ended reflective long-period fiber grating sensor, the steps of which are:

[0051] A. Flattening one end of the LPFG to form LPFG segment 1 and fiber segment 2;

[0052] B. Inside the long-period fiber grating segment 1 is the fiber grating segment core 4, and a layer of fiber grating metal film 7 is coated on the surface of the long-period fiber grating segment 1, and the surface of the long-period fiber grating forms a plasmon resonance effect; the fiber grating segment metal The thickness of film 7 is 50nm;

...

Embodiment 3

[0057] This embodiment is similar to Embodiment 1, wherein the fiber grating segment 1 of the sensor has a length of 6 cm, the fiber segment 2 has a length of 2 cm, and the tail end segment 3 has a length of 6 cm. The metal film 7 of the fiber grating segment has a thickness of 100 nm, and the metal film 8 of the tail end segment and the metal film 9 of the end face of the tail end segment have a thickness of 1000 nm.

[0058] A manufacturing process based on a single-ended reflective long-period fiber grating sensor, the steps of which are:

[0059] A. Flattening one end of the LPFG to form LPFG segment 1 and fiber segment 2;

[0060] B. Inside the long-period fiber grating segment 1 is the fiber grating segment core 4, and a layer of fiber grating metal film 7 is coated on the surface of the long-period fiber grating segment 1, and the surface of the long-period fiber grating forms a plasmon resonance effect; the fiber grating segment metal The thickness of the film 7 is 10...

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Abstract

The invention discloses a single-end reflective long-period fiber grating sensor and a manufacture process thereof, wherein the single-end reflective long-period fiber grating sensor and the manufacture process thereof belong to the field of fiber grating sensing technology. The single-end reflective long-period fiber grating sensor comprises a long-period fiber grating segment, a fiber segment and a tail segment. The long-period fiber grating segment, the fiber segment and the tail segment are successively arranged from left to right. The surface of the long-period fiber grating segment is provided with a fiber grating segment metal film. The surface of the tail segment is provided with a tail segment metal film. The end surface of the tail segment is provided with a tail segment end surface metal film. In the fiber grating segment, a fiber grating segment core and the fiber grating segment metal film are successively arranged from inside to outside. The fiber grating segment metal film, the tail segment metal film and the tail segment end surface metal film are palladium films. The single-end reflective long-period fiber grating sensor has a probe type structure and has advantages of simple structure, small size and high sensitivity. Furthermore the single-end reflective long-period fiber grating sensor is sensitive to external physical quantities such as temperature, refractivity and liquid level. Furthermore the single-end reflective long-period fiber grating sensor can be widely used in the fields of biology, chemistry, physics, civil engineering, medical treatment, etc.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensing, and relates to a reflective long-period optical fiber grating sensor, in particular to a single-end reflective long-period optical fiber grating sensor and a manufacturing process thereof. Background technique [0002] The period of the long-period fiber grating (LPFG) is tens to hundreds of microns, which is the coupling between the core fundamental mode and the cladding mode propagating in the same direction, and its function is to couple the light wave of a specific wavelength propagating in the fiber to the cladding loss, without reflection. Experiments have proved that the transmission characteristics of long-period fiber gratings will change due to changes in external stress, temperature and other factors, and are more sensitive than fiber Bragg gratings (FBG), which is an ideal sensing element. Its application fields are very wide, and it has a good application prosp...

Claims

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Application Information

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IPC IPC(8): G01D5/26G01D5/38
CPCG01D5/268G01D5/38
Inventor 王彦胡兴柳刘加萍方挺
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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