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Method for making fibre-optical grating for sensing detection

A fiber grating and manufacturing method technology, applied in the field of optoelectronics, can solve the problems of low pressure and temperature response sensitivity, and achieve the effect of wide application prospects

Inactive Publication Date: 2004-12-22
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to use the infrared pulsed laser beam to directly write the long-period grating (LPFG) used for sensing and testing the fiber core, solve the problem of low sensitivity of the fiber grating to pressure and temperature response from the technical source, and make a more capable Long Period Fiber Bragg Gratings Suitable for Sensing Test Needs

Method used

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  • Method for making fibre-optical grating for sensing detection
  • Method for making fibre-optical grating for sensing detection
  • Method for making fibre-optical grating for sensing detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Since the silicon fiber is sensitive to temperature changes, a Corning SMF-28 silicon fiber was selected, CO 2 The output power of the pulsed laser is 10W, using the device figure 1 The long-period fiber grating used for sensing and detecting temperature is produced. The period of the LPFG is Λ=450 μm, the number of periods is 500, the resonant wavelength λ=1530.82nm in its free state, and the transmission peak is 21.09dB. Its transmission spectrum is as figure 2 as shown,

[0038]The written LPFG is encapsulated with temperature-sensitive material epoxy resin polymer material.

Embodiment 2

[0040] In order to enhance the mechanical strength of the fiber grating, a silicon fiber with a large core diameter is selected. 2 The output power of the pulsed laser is 20W, using the device figure 1 The long-period fiber grating used for sensing and detecting temperature is manufactured. The period Λ of the LPFG is 600 μm, and the number of periods is 500. Its transmission spectrum is as follows: image 3 shown.

[0041] Encapsulate the written LPFG with temperature-sensitive polyamide fiber polymer material.

Embodiment 3

[0043] Since the plastic optical fiber is sensitive to pressure changes, an anti-fatigue plastic optical fiber is selected, CO 2 The output power of the pulsed laser is 10W, using the device figure 1 Fabricated long-period fiber gratings for sensing and detecting pressure. The period Λ of this LPFG is 450μm, and the number of periods is 500, and its transmission spectrum is as follows Figure 4 shown.

[0044] The written LPFG is encapsulated with the pressure-sensitive material Teflon.

[0045] In addition to the above-mentioned various embodiments, using the method described in this patent, it is also possible to fabricate long-period fiber gratings for sensing tests with different wavelengths and characteristics in single-mode fibers.

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Abstract

The invention belongs to the field of optoelectronic technology, and is a long-period optical fiber grating manufacturing method for sensing and detecting strain and high temperature response sensitivity. The infrared pulsed laser beam is directly irradiated to the bare optical fiber core step by step and point by point, so that the optical fiber The refractive index of the core changes periodically and permanently. By selecting different fiber core materials and packaging materials, fiber gratings with different characteristics are produced. The temperature and stress response sensitivity of the grating is 100 times higher than that of the fiber grating for communication. Measuring the interior of objects and materials, it can realize the simultaneous distinction and real-time monitoring of pressure and temperature, and has a wide range of application prospects.

Description

[0001] Involved areas [0002] The invention belongs to the technical field of optoelectronics, and relates to a manufacturing method of an optical fiber grating used for sensing and detecting strain and temperature with high response sensitivity. Background technique [0003] As a sensor of intelligent structure, fiber grating can be embedded in the measured object and material to realize multi-point distribution, simultaneous distinction, real-time online and permanent detection of pressure, temperature, stress, strain, flow rate, flow and many other physical quantities. The detection principle is basically that the wavelength shift, phase change, polarization state change and intensity change of the fiber grating reflection or transmission spectrum are caused by the change of the measured physical quantity, and the detection purpose of the measured physical quantity is achieved by demodulating these spectral changes . Since fiber grating has many essential advantages such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18G02B6/124
Inventor 乔学光
Owner XI'AN PETROLEUM UNIVERSITY
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