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Low-cost optical fiber humidity sensor

A humidity sensor, low-cost technology, applied in nanotechnology, instruments, scientific instruments and other directions for sensing, can solve the problems of low accuracy, complex equipment, low sensitivity, etc., to achieve low cost, simple preparation, high sensitivity Effect

Inactive Publication Date: 2020-08-18
西安柯莱特信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional optical fiber humidity sensors require dislocated optical fibers or scored optical fibers, complex equipment, high cost, low sensitivity, and low accuracy

Method used

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  • Low-cost optical fiber humidity sensor
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  • Low-cost optical fiber humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present invention provides a low-cost optical fiber humidity sensor, which includes a light source, a photodetector, a base 1, a first support part 21, a second support part 22, a first optical fiber 31, a second optical fiber 32, a coupling part 4. Moisture-sensitive material part 5 and precious metal part 6. Such as figure 1 As shown, the first supporting part 21 and the second supporting part 22 are fixed on the base 1 . The moisture sensitive material part 5 is disposed between the first support part 21 and the second support part 22 . The moisture sensitive material part 5 is a hygroscopic expansion material, that is, the moisture sensitive material part 5 will expand after absorbing moisture. Preferably, the material of the hygroscopic material part 5 is polyimide. The first optical fiber 31 is fixed on the first supporting part 21 , and the second optical fiber 32 is fixed on the second supporting part 22 . The coupling part 4 is a bare fiber core, that i...

Embodiment 2

[0025] On the basis of Example 1, such as figure 2 As shown, the noble metal part 6 is noble metal particles 7 arranged periodically. The material of the noble metal particles 7 is gold, and the particle diameter of the noble metal particles 7 is 20 nm-80 nm. The material of the precious metal particles 7 is gold, which is more conducive to improving the stability of the material and is not easily oxidized in the air. The particle size of the noble metal particles 7 is 20 nm-80 nm, so that the resonance wavelength of the noble metal particles 7 is in the visible light band. In this embodiment, the light in the bare core is coupled to the noble metal particles 7 , causing the vibration of charges in the noble metal particles 7 . At a specific wavelength, the light in the bare fiber core and the noble metal particles 7 achieve surface plasmon resonance, and valleys appear in the transmission spectrum. This signal feature makes detection easier. Since the valley has a certain...

Embodiment 3

[0029] On the basis of Example 2, such as image 3 As shown, the moisture-sensitive material part 5 is not in contact with the first support part 21 and the second support part 22 . That is to say, there is a gap between the moisture-sensitive material part 5 and the first supporting part 21 ; there is also a gap between the moisture-sensitive material part 5 and the second supporting part 22 . When the moisture-sensitive material part 5 absorbs moisture and expands, the moisture-sensitive material part 5 not only expands in the vertical direction, but also expands in the horizontal direction. This not only changes the distance between the bare core and the noble metal particles 7 , but also changes the spacing between the noble metal particles 7 . Preferably, the distance between noble metal particles is less than 40 nanometers. A change in the spacing between the noble metal particles 7 changes the resonance wavelength of the noble metal particles 7 . Therefore, this embo...

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Abstract

The invention provides a low-cost optical fiber humidity sensor. A noble metal part is arranged on a humidity-sensitive material part; the exposed fiber core is arranged at the upper part of the precious metal part and forms a gap with the precious metal part. When the humidity sensor is used, the humidity-sensitive material part absorbs moisture and expands, the distance between the precious metal part and the exposed fiber core is reduced, and the coupling of the exposed fiber core and the precious metal part is enhanced, so that the transmission characteristic of light from the first optical fiber to the second optical fiber is changed, and environmental humidity detection is realized by detecting the transmission characteristic. The coupling of the light propagating in the fiber core and the precious metal part outside the fiber core is very sensitive to the distance between the light and the precious metal part, so that the low-cost optical fiber humidity senso has the advantage of high sensitivity. Moreover, in the design, only the fiber core needs to be planed, and the preparation of the noble metal part is relatively simple, so that the humidity sensor is low in cost and has a good application prospect in the field of humidity detection.

Description

technical field [0001] The invention relates to the field of humidity sensing, in particular to a low-cost optical fiber humidity sensor. Background technique [0002] Humidity monitoring has important applications in the fields of electronic appliances, food storage, aerospace, and cultural relics protection. Traditional humidity sensors include hair hygrometers, psychrometer hygrometers, and electric hygrometers. Traditional humidity sensors are easily affected by the environment and are not suitable for applications in harsh environments. Optical fiber humidity sensor provides a new means for humidity sensing. Traditional optical fiber humidity sensors require misplaced optical fibers or scored optical fibers, which are complicated in equipment, high in cost, low in sensitivity and low in accuracy. Contents of the invention [0003] In order to solve the above problems, the present invention provides a low-cost, high-sensitivity optical fiber humidity sensor, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17B82Y15/00
CPCB82Y15/00G01N21/17
Inventor 不公告发明人
Owner 西安柯莱特信息科技有限公司
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