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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: 2004-01-14
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to use infrared pulsed laser beams to directly write long-period fiber gratings (LPFG) for sensing and testing to the fiber core, to solve the problem of low sensitivity of fiber gratings to pressure and temperature responses from the technical source, and to produce more Long-period fiber gratings suitable for sensing testing 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
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Effect test

Embodiment 1

[0033] 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 manufactured LPFG for temperature sensing has a period Λ=450 μm and a period number of 500. In its free state, the resonant wavelength λ=1530.82nm and the transmission peak value is 21.09dB. Its transmission spectrum is as figure 2 as shown,

[0034] The written LPFG is encapsulated with temperature-sensitive material epoxy resin polymer material.

Embodiment 2

[0036] In order to enhance the mechanical strength of the fiber grating, a silicon fiber with a large core diameter is selected. 2The 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.

[0037] Encapsulate the written LPFG with temperature-sensitive polyamide fiber polymer material.

Embodiment 3

[0039] 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.

[0040] The written LPFG is encapsulated with the pressure-sensitive material Teflon.

[0041] 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 present invention discloses a process for making long period optical fiber grating for sensing and detecting degree of strain and temperature characterized by that, using the infrared pulsed laser beam directly and gradually irradiating on the bare optical fiber core periodically point-to-point, making the refractivity of the optical fiber core change periodically forever. By selecting different optical fiber core material and packing material, the optical fiber grating of different characteristics can be made, with temperature and stress response sensitivity raised by more than 100 times of that of the optical fiber grating for communication, it can be buried inside the measured object and material, resulting the simultaneous distinction and real time monitoring for pressure and temperature.

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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IPC IPC(8): G02B5/18G02B6/124
Inventor 乔学光
Owner XI'AN PETROLEUM UNIVERSITY
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