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Gas refractive index sensing element and sensing device

A gas refractive index and sensing element technology, applied in the field of sensors, can solve the problems of large volume and difficult integration

Inactive Publication Date: 2010-09-01
CHONGQING UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the developed SPR sensor mainly adopts the attenuated total reflection prism coupling method. Although this method can improve the detection sensitivity, it also has the defects of large volume and difficult integration.

Method used

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  • Gas refractive index sensing element and sensing device
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  • Gas refractive index sensing element and sensing device

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Embodiment Construction

[0008] figure 1 It is a schematic diagram of the gas refractive index sensing device of the present invention. The device is composed of a laser, an optical fiber, a detection cavity, a metal grating and a spectrum analyzer. The light source emitted from the laser is coupled into the optical fiber and introduced into the detection cavity. After being expanded by the beam expander, it reaches the metal grating through an optical path, and is reflected on the surface of the metal grating. The reflected light is coupled into the optical fiber by a coupler and introduced into the spectral analysis. instrument.

[0009] figure 2 For the geometric structure of the gas refractive index sensing element of the present invention, the sensing element in this example is a silver metal grating. The linearly polarized plane wave of TM polarization is incident on the surface of the metal grating at a fixed angle θ, and the surface plasmon wave is excited on the surface of the metal grati...

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Abstract

The invention provides a sensing element and a device thereof for determining the value of gas refractive index, and the sensing element is characterized by comprising a laser, an optical fiber, a detection cavity, a metal grating and a spectrum analyzer. A light source emitted from the laser is coupled in the optical fiber, is led in the detection cavity, and is subjected to beam expansion by a beam expander to reach the metal grating via an optical path, and then reflects on the metal grating surface; and the reflecting light is coupled in the optical fiber by a coupler and is led into the spectrum analyzer. The gas sensing device designed by the invention is characterized by high measurement precision, safe application, real-time detection and remote transmission, small volume of sensing parts, integratability and no need of power supply.

Description

technical field [0001] This patent relates to the field of sensors, especially a gas refractive index sensing element and sensing device with a central wavelength of 1300 nanometers based on optical fiber conduction and metal grating excitation surface plasmon effects. Background technique [0002] For the detection of gas refractive index, the traditional methods mainly use Michelson interferometry and Mach-Zehnder interferometer method. Both detection methods have the limitations of large volume, difficult integration, automatic detection and remote transmission. Recent studies have shown that the surface plasmon resonance (Surface Plasmons Resonance, referred to as SPR) can be excited at the metal / medium interface. This makes SPR of great application value in the design of high-sensitivity sensors. SPR-based sensing technology has outstanding features such as high sensitivity, no calibration, real-time detection, non-contact, and no damage. It can be used for the analysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41
Inventor 赵华君袁代蓉
Owner CHONGQING UNIV OF ARTS & SCI
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