Method for manufacturing composite fiber F-P sensor based on self-focusing effect

A technology of a composite structure and a manufacturing method, which is applied in the transmission of sensing components, instruments, optics and other directions using optical devices, can solve the problems of difficulty in low-cost, mass production, high adjustment accuracy requirements, and high processing system costs. Reduce optical transmission loss, simple production steps, and improve the effect of reflected spectral fringe contrast

Inactive Publication Date: 2012-05-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This type of sensor has good performance and high repeatability, and is suitable for mid-to-high-end products. However, the processing system is expensive and not suitable for popularization. In addition, the processing process requires precise alignment between the mask plate and the optical fiber, and the adjustment accuracy is very high, which is difficult to reduce. cost, mass production

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  • Method for manufacturing composite fiber F-P sensor based on self-focusing effect
  • Method for manufacturing composite fiber F-P sensor based on self-focusing effect
  • Method for manufacturing composite fiber F-P sensor based on self-focusing effect

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[0027] Adopt spectrum analyzer 9, 3dB coupler 10 and fiber optic method Perot composite structure sensor 11 to constitute the refractive index and temperature of sensing system measurement solution 12, as Image 6 shown. At the same time, the temperature and refractive index are calibrated by the thermometer 13 and the Abbe refractometer. The reflection spectrum of the fiber-optic F-P composite sensor 11 is recorded by a spectrum analyzer 9 . During the fabrication process of the fiber-optic F-P composite structure sensor, the reflection spectra of the single-mode fiber end face, the air cavity and the F-P composite structure sensor are as follows: Figure 7 shown. The fringe contrast ratio of the reflection spectrum of the optical fiber F-P composite structure sensor can reach more than 32dB.

[0028] Refractive index and temperature are measured by changes in fringe contrast and wavelength shift, respectively. The temperature measurement results of the fiber-optic F-P co...

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Abstract

The invention discloses a method for manufacturing a composite fiber F-P sensor based on the self-focusing effect, comprising the following steps: manufacturing a micropore on the end face of a multimode graded index fiber by adopting chemical corrosion or laser micromachining technology; welding the multimode graded index fiber with the micropore with a single mode fiber to form a fiber F-P cavity structure; cutting the multimode graded index fiber and realizing the high performance fiber F-P sensor when the length meets certain conditions. The method reduces the loss of the fiber F-P cavityby adopting the self-focusing effect in the multimode graded index fiber and improves the reflectivity of the end face, thus ensuring the fringe contrast of the reflectance spectrum of the fiber F-P sensor to be higher than 30dB. The fiber sensor manufactured by the method has high measuring sensitivity of refractive index and temperature and good linearity.

Description

technical field [0001] The invention relates to an optical fiber sensor, in particular to a method for manufacturing an optical fiber F-P composite structure sensor based on the self-focusing effect. Background technique [0002] Optical fiber Fab sensors have been widely used in the sensing of parameters such as strain, pressure, temperature, and refractive index in many fields such as industry and military. The traditional fiber-optic F-P sensor mainly fuses a section of hollow-core fiber, or step-index multimode fiber, or hollow-core photonic crystal fiber between two sections of single-mode fiber. The measurement sensitivity is not high. Fiber Bragg gratings and coatings can be used to improve reflectivity, but the former has a narrow bandwidth and the latter has poor mechanical stability. [0003] Application number is 200710078516.8, publication number is CN 101055197A Chinese invention patent "micro-fiber fiber optic sensor and manufacturing method made by femtoseco...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26G02B6/00G01K11/32G01N21/41
Inventor 龚元饶云江郭宇赵天
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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