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Manufacture method of tilted fiber grating hydrogen sensor based on optical catalytic oxidation

A technology of inclined fiber grating and photocatalytic oxidation, which is applied in the measurement of phase influence characteristics, etc., to solve the poisoning of hydrogen-sensitive catalysts, improve the sensitivity, and make it easy to manufacture.

Inactive Publication Date: 2010-10-27
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tilted fiber gratings have not been reported for hydrogen sensing

Method used

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  • Manufacture method of tilted fiber grating hydrogen sensor based on optical catalytic oxidation
  • Manufacture method of tilted fiber grating hydrogen sensor based on optical catalytic oxidation
  • Manufacture method of tilted fiber grating hydrogen sensor based on optical catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1. First prepare sol-gel tungstic acid with protonated cation exchange resin with sodium tungstate, wash the prepared tungstic acid with deionized water and centrifuge 3 times; heat to 50°C and let stand for 5 hour, make it dry into powder; then add platinum chloric acid, stir and heat to 400°C, let it stand for 1 hour to obtain platinum-doped tungsten oxide powder whose surface is adsorbed by platinum, wherein the molar ratio of platinum to tungsten is 1:14; Finally, the platinum-doped tungsten oxide powder is added to the ethanolamine solvent, and then it is uniformly deposited on the surface of the inclined fiber grating by dipping and coating to form a hydrogen sensitive film.

Embodiment 2

[0013] Example 2. First prepare sol-gel tungstic acid with protonated cation exchange resin with sodium tungstate, wash the prepared tungstic acid with deionized water and centrifuge 5 times; hour, make it dry into powder; then add platinum chloric acid, stir and heat to 450°C, let it stand for 1.5 hours to obtain platinum-doped tungsten oxide powder whose surface is adsorbed by platinum, wherein the molar ratio of platinum to tungsten is 1:14; Finally, the platinum-doped tungsten oxide powder is added to the ethanolamine solvent, and then it is uniformly deposited on the surface of the inclined fiber grating by dipping and coating to form a hydrogen sensitive film.

Embodiment 3

[0014] Example 3. First, sol-gel tungstic acid was prepared with protonated cation exchange resin with sodium tungstate, and the prepared tungstic acid was washed with deionized water and centrifuged 8 times; heated to 60°C, and stood for 7 hour, make it dry into powder; then add platinum chloric acid, stir and heat to 500°C, let it stand for 2 hours to obtain platinum-doped tungsten oxide powder whose surface is adsorbed by platinum, wherein the molar ratio of platinum to tungsten is 1:14; Finally, the platinum-doped tungsten oxide powder was added to the ethanolamine solvent, and then it was uniformly deposited on the surface of the inclined fiber grating by dip coating to form a hydrogen sensitive film.

[0015] Platinum-doped tungsten oxide films were prepared on the surface of inclined gratings by sol-gel method. When hydrogen exists, the tungsten oxide film will produce the following chemical reactions:

[0016]

[0017]

[0018] When tungsten trioxide is reduced ...

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Abstract

The invention relates to a manufacture method of a tilted fiber grating hydrogen sensor based on optical catalytic oxidation. A traditional sensor is influenced obviously by temperature. In the manufacture method, a platinum-doped tungsten oxide thin film is plated on the circumference of the surface of a tilted fiber grating by a sel-gel method, and the method comprises the following steps of: preparing sel-gel like tungstic acid by using protonation cation exchange resin with sodium tungstate, and washing the prepared tungstic acid with deionized water and centrifuging N times; heating to 50-60 DEG C and standing for 5-7 hours to dry into powder; then adding chloroplatinic acid, stirring and heating to 400-500 DEG C and standing for 1-2 hours to obtain the platinum-doped tungsten oxide powder with platinum-adsorbed surfaces, wherein the molar ratio of the platinum to tungsten is 1:14; and finally adding the platinum-doped tungsten oxide powder into an ethanolamine solvent, and uniformly depositing the platinum-doped tungsten oxide powder on the surface of the tilted fiber grating by using a dipping and coating method. The sensor produced by the method can improve sensitivity of hydrogen measurement and shorten response time.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a method for manufacturing a tilted optical fiber grating hydrogen sensor based on photocatalytic oxidation. Background technique [0002] Hydrogen is being widely used as a new fuel. Solid or liquid hydrogen is highly volatile, and when the concentration of leaked hydrogen in the air is greater than 4%, it is very easy to cause an air explosion. Optical fiber hydrogen sensor is very suitable for detecting this dangerous gas due to its high sensitivity and no sparks. Among them, the most widely used is to coat a layer of palladium film on the end surface of the optical fiber to form a micro-lens. The hydrogen concentration can be measured through the change of the emission light intensity caused by the reaction between the palladium film and hydrogen gas; using palladium film and tungsten oxide as sensitive materials is a way to improve the detection sensitivity. ...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 邵理阳董新永金尚忠
Owner CHINA JILIANG UNIV
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