Optical fiber humidity sensor based on anodic porous oxidized metal and preparation method thereof

A technology of humidity sensor and metal oxide, which is applied in the direction of color/spectral characteristic measurement, etc., to achieve the effect of optimizing sensor performance, improving sensitivity and good repeatability

Active Publication Date: 2015-07-22
武汉雷施尔光电信息工程有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

However, traditional humidity sensors are electrochemical sensors, which cannot work in specific environments (such as pollution and strong electromagnetic interference environments)

Method used

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  • Optical fiber humidity sensor based on anodic porous oxidized metal and preparation method thereof
  • Optical fiber humidity sensor based on anodic porous oxidized metal and preparation method thereof
  • Optical fiber humidity sensor based on anodic porous oxidized metal and preparation method thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Taking aluminum as an example, the present invention provides an optical fiber humidity sensor based on anodic porous alumina, such as figure 2 As shown, including an optical fiber 1, a porous alumina film 2 with a thickness of 20-100 um is pasted on one end of the optical fiber, wherein the holes in the porous alumina film 2 are arranged in a regular order, and the direction of the holes is consistent with the direction of light propagation, as shown in figure 1 As shown, the pores in the porous alumina film have a pore size of 30-120 nm.

[0023] An optical fiber humidity sensing test system, such as image 3 As shown, it includes a light source 3 (this embodiment selects a 1510nm LED light source), a coupler 4 (a 3dB single-mode coupler is selected in this embodiment), a spectrometer 9 and the above-mentioned optical fiber humidity sensor 5...

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Abstract

The invention provides an optical fiber humidity sensor based on anodic porous oxidized metal. The optical fiber humidity sensor comprises an optical fiber, wherein a porous oxidized metal film of which the thickness is 20-100 microns is adhered to the end surface of one end of the optical fiber; pores in the porous oxidized metal film are arrayed regularly and orderly; the direction of each pore is consistent to the propagation direction of light. By utilizing the porous structure film which is regular and ordered, the small-sized humidity sensor is designed, so that an outer-cavity-type Fabry-Perot interference cavity is formed; by utilizing a blood capillary effect, external water can be effectively absorbed, so that the qualitative change of transmission light is caused, the aim of monitoring the external temperature is achieved, the defects of no corrosion resistance, no electric radiation resistance and the like of a conventional electrochemical temperature sensor are overcome, and the optical fiber humidity sensor has the advantages of miniaturization, repeatability, stability and potential low cost.

Description

technical field [0001] The invention relates to the intersecting field of optical fiber sensing technology, material science and optoelectronic technology, in particular to an optical fiber humidity sensor based on anodic porous metal oxide and a preparation method thereof. Background technique [0002] Detecting and controlling changes in humidity plays a vital role in many fields. Aerospace, building health, food safety, medicine, warehousing, agriculture and other industries have very strict requirements on humidity, which is directly related to the quality and safety of products. There are various kinds of humidity sensors with different principles. Among them, the humidity sensor based on porous alumina structure has the best stability and repeatability. However, traditional humidity sensors are electrochemical sensors, which cannot work in specific environments (such as pollution and strong electromagnetic interference environments). Optical fiber sensors have attrac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 杨明红黄楚佳谢唯静李冬文代吉祥
Owner 武汉雷施尔光电信息工程有限公司
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