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Gas refractive index sensor

A gas refractive index and sensor technology, applied in instruments, scientific instruments, nanotechnology, etc., can solve the problems of low transmittance and insufficient sensitivity.

Active Publication Date: 2009-05-13
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the transmittance of light energy in the above-mentioned photonic crystal structure is very low, and the sensitivity of this refractive index sensor is not high enough (about 150 nm / unit refractive index)

Method used

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Embodiment Construction

[0012] The structure of the gas refractive index sensor 100 of this embodiment will be described in detail below with reference to the drawings.

[0013] Referring to FIG. 2 and FIG. 3 , the gas refractive index sensor 100 of this embodiment mainly includes a photonic crystal module 200 , a light source 300 and a detector 400 .

[0014] The photonic crystal module 200 includes a base 202 . The base 202 is a cuboid structure, including a first plane 204 and a second plane 206 opposite to the first plane 204, wherein the longer side on the first plane 204 is the first side 218, and the side opposite to it is the second side. Side 220. The substrate 202 is provided with a large number of cylindrical air holes 208 vertically penetrating the first plane 204 and the second plane 206 , and the air holes 208 form a triangular photonic crystal module 200 , that is, the air holes 208 are arranged corresponding to the lattice points of the crystal lattice. The lattice constant of the t...

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Abstract

The invention relates to a gas refractive index sensor which comprises a photonic crystal module, a light source and a detector. The light source and the detector are respectively arranged at the two ends of the photonic crystal module. The photonic crystal module comprises a matrix which comprises a first plane and a second plane opposite to the first plane. The matrix is provided with a plurality of air holes which vertically penetrate the first plane and the second plane. The air holes form a triangular photonic crystal module, wherein, the diameter of the air hole arranged at the central position of the matrix is less than the diameters of other air holes to form a resonant cavity, wherein, two opposite sides of the resonant cavity are provided with linear defects formed by the matrix without the air holes, and the linear defects are a first wave guide and a second wave guide respectively. The first wave guide and the second wave guide are respectively separated from the resonant cavity by several holes.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a gas refraction index sensor. Background technique [0002] The refractive index of the gas can directly reflect and measure the pressure, density, composition and temperature of the gas, so the precise measurement of the refractive index of the gas can observe the above indicators of the gas. The gas refractive index sensor commonly used in the prior art measures the gas refractive index through optical fiber cavity interference. However, this kind of gas sensor has a relatively large volume, which is not suitable for the measurement condition of very few gas samples, and is also not suitable for integration with other optical devices. [0003] A photonic crystal is an artificial dielectric structure with a periodic change in permittivity (on the wavelength scale of light). Similar to the formation of electron energy bands by electrons in crystals under the action of periodic potential fields,...

Claims

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Application Information

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IPC IPC(8): G01N21/41
CPCG01N21/774G01N21/41G01N21/7746G01N2021/7776B82Y20/00G02B6/1225
Inventor 王晓玲金国藩朱钧
Owner TSINGHUA UNIV
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