An angle-dependent photonic crystal hydrogen sensor measurement method

A photonic crystal, angle-dependent technology, applied in the field of gas sensors, can solve problems such as threats to personal and property safety, fire, explosion, etc., and achieve the effect of small probe size and meet the needs of hydrogen detection

Inactive Publication Date: 2018-04-13
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, hydrogen is a high-risk gas. Under normal temperature and pressure, if the hydrogen content in the air is between 4% and 74.5%, it is very likely to cause fires, explosions and other accidents, threatening personal and property safety.

Method used

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  • An angle-dependent photonic crystal hydrogen sensor measurement method
  • An angle-dependent photonic crystal hydrogen sensor measurement method
  • An angle-dependent photonic crystal hydrogen sensor measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 2 To build a model, the thickness of the air layer is set to 1.2 microns, the thickness of the quartz layer is set to 1.2 microns, the thickness of the titanium dioxide layer is set to 150 nanometers, and the period is set to 400 nanometers;

[0041] The refractive index of air is set to 1, the refractive index of quartz is set to 1.46, the refractive index of titanium dioxide is set to 2.22, the incident wavelength is set to 633 nm, and the speed of light is set to 3×10 8 m / s, the ridge height is set to 15 nanometers, 30 nanometers, and 50 nanometers respectively, and the relationship between the transmission coefficient of the TM mode and the incident angle is calculated at different ridge heights;

[0042] Such as image 3 As shown in the figure, the relationship between the transmission coefficient of the TM mode and the incident angle under the condition of different ridge heights is shown in the figure. It can be seen that, other conditions remain...

Embodiment 2

[0044] Such as figure 2To build a model, the thickness of the air layer is set to 1.2 microns, the thickness of the quartz layer is set to 1.2 microns, the height of the ridge is set to 50 nanometers, and the period is set to 400 nanometers;

[0045] The refractive index of air is set to 1, the refractive index of quartz is set to 1.46, the refractive index of titanium dioxide is set to 2.22, the incident wavelength is set to 633 nm, and the speed of light is set to 3×10 8 m / s, the thickness of titanium dioxide is set to 150 nanometers, 165 nanometers, and 180 nanometers respectively, and the relationship between the transmission coefficient of the TM mode and the incident angle is calculated when the thickness of titanium dioxide is different;

[0046] Such as Figure 4 As shown in the figure, the relationship between the transmission coefficient of the TM mode and the incident angle under the condition of different titanium dioxide thicknesses is shown in the figure. It ca...

Embodiment 3

[0048] Such as figure 2 To build a model, the thickness of the air layer is set to 1.2 microns, the thickness of the quartz layer is set to 1.2 microns, the thickness of the titanium dioxide layer is set to 150 nanometers, the ridge height is set to 50 nanometers, and the period is set to 400 nanometers;

[0049] The refractive index of air is set to 1, the refractive index of quartz is set to 1.46, the refractive index of titanium dioxide is 2.22, and the speed of light is set to 3×10 8 m / s, the incident wavelength is set to 620 nm, 627 nm, and 633 nm, respectively, and the relationship between the transmission coefficient of the TM mode and the incident angle is calculated at different incident wavelengths;

[0050] Such as Figure 5 As shown in the figure, the relationship between the transmission coefficient of the TM mode and the incident angle under different incident wavelengths is shown in the figure. It can be seen that, other conditions remain unchanged, when only ...

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Abstract

The invention discloses a photonic crystal hydrogen sensor adopting angle independence. A titanium dioxide photonic crystal is prepared on a quartz substrate, the period is adjustable, palladium-based alloy films grow on the two side faces of the photonic crystal respectively, the thickness is adjustable, laser beams enter the photonic crystal at a fixed angle (the angle is usually the photonic crystal resonant angle) after being collimated, the transmission coefficient at the moment is 0%, and the size of palladium is increased after palladium absorbs hydrogen, so that the photonic crystal is stretched, the period is prolonged, the resonance angle is moved toward the large-angle direction, and the transmission coefficient of the incidence angle position can change to 70% or above; compared with a traditional reflecting type hydrogen sensor, sensitivity can be improved by 2-3 magnitude orders.

Description

technical field [0001] The invention belongs to the technical field of gas sensor, and in particular relates to a measurement method of an angle-dependent photonic crystal hydrogen sensor. Background technique [0002] Hydrogen energy is a renewable and clean energy and an effective way to ensure energy sustainability. In May 2010, the 18th World Hydrogen Energy Conference was held in Essen, Germany. China’s Minister of Science and Technology Wan Gang pointed out that China should formulate a national hydrogen energy plan, increase investment in hydrogen energy, expand the demonstration and application of hydrogen energy, and strengthen International cooperation in hydrogen energy. On July 12, 2010, the world's first hydrogen energy power station was completed and put into operation in Italy, marking that the utilization of hydrogen energy has entered the substantive stage. Due to the excellent characteristics of hydrogen, it is also widely used in other fields, such as se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/59
CPCG01N21/59G01N2021/5903
Inventor 周平伟朱礼国杜良辉翟召辉李江钟森城王德田刘乔孟坤
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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