Manufacture method of high temperature resistant fiber grating

A technology of optical fiber grating and manufacturing method, which is applied to cladding optical fiber, optical waveguide, light guide, etc., can solve the problems of high production cost, poor mechanical strength, low pass rate, etc., achieve low cost, low processing equipment requirements, and use Simple and convenient effect

Inactive Publication Date: 2016-10-12
深圳市畅格光电有限公司
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Problems solved by technology

[0016] Regenerated grating: poor mechanical strength, low pass rate, high production cost;

Method used

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  • Manufacture method of high temperature resistant fiber grating
  • Manufacture method of high temperature resistant fiber grating

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] A method of manufacturing a high temperature resistant fiber grating:

[0052] Step 1: Store Polyimide (polyimide)-coated ordinary single-mode fiber in 10Mpa hydrogen for 24 hours to make the fiber have photosensitivity;

[0053] Step 2: Store the optical fiber in an oven at 150°C for 30 minutes, so that the inductive factor hydrogen in the optical fiber reaches a certain ratio;

[0054] Step 3: Use concentrated sulfuric acid to soak the grating area of ​​the fiber to be written at a high temperature of 120 degrees to remove the polyimide coating;

[0055] Step 4: Use a 248nm ultraviolet laser to write the fiber grating. The pulse energy of the writing light is set to 4.7±0.1mJ / Pulse, and the frequency is set to 35±5HZ. Detect that the grating bandwidth growth rate is between 2pm / s and 4pm / s. After the grating spectral line bandwidth stops growing, continue to...

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Abstract

The invention provides a manufacture method of a high temperature resistant fiber grating. The manufacture method comprises the steps that hydrogen-carrying treatment is carried out on an ordinary single-mode quartz optical fiber coated with polyimide in a high-pressure environment; the optical fiber is placed into a high-temperature oven for annealing; a grating to be written area of the optical fiber is soaked by concentrated sulfuric acid at high temperature; an ultraviolet laser is used for fiber grating writing; the grating bandwidth growth rate is between 2 pm/s and 4pm/s; after the grating spectral line bandwidth stops growing, exposure is continued for a period of time; polyimide is used to re-coat bare positions of the optical fiber; the fiber grating is placed into the oven at the temperature of 400+/-10 DEG C for high-temperature heat treatment; and the center wavelength and the reflectivity of the grating spectral line are detected on-line. According to the invention, a sensor manufactured by the high temperature resistant fiber grating can be directly used in a working environment of 400 DEG C; and the sensor designed by the grating has the advantages of simple and direct use and accurate data.

Description

technical field [0001] The invention relates to a manufacturing method of an optical fiber grating, in particular to a manufacturing method of a high temperature resistant optical fiber grating. Background technique [0002] At present, some high-temperature fields such as the petroleum industry, thermal power stations, aerospace technology, and metallurgical industry need high-temperature fiber gratings to make sensors. Therefore, it is very important to improve the stability of fiber gratings at high temperatures. [0003] Ordinary fiber gratings can only work stably in an environment below 200°C. If you want to use this type of grating to make sensors for high-temperature environments, you need to go through complex packaging design, or create temperature gradients or convert temperature changes into stress changes. It is transmitted to the fiber grating to complete the measurement in the high temperature environment. This design will cause a large measurement error. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02123
Inventor 赵德春
Owner 深圳市畅格光电有限公司
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