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Adaptive surface plasma wave gas refractivity sensor

A technology of surface plasmon and gas refractive index, applied in the direction of polarization influence characteristics, phase influence characteristic measurement, instruments, etc., can solve problems such as difficulties and achieve the effect of improving stability

Inactive Publication Date: 2002-04-17
TSINGHUA UNIV
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Problems solved by technology

This requirement is easily met with a frequency-stabilized He-Ne laser, and the stability of the incident angle is required to be less than 2×10 -7 Ratio, if you want to control the direction drift of the beam in a long time to be less than 2×10 -7 Orphanity is quite difficult

Method used

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  • Adaptive surface plasma wave gas refractivity sensor
  • Adaptive surface plasma wave gas refractivity sensor
  • Adaptive surface plasma wave gas refractivity sensor

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Embodiment Construction

[0009] figure 1 As the surface plasmon wave sensing element in the prior art, it is a prism. The incident ray is perpendicular to the plane ABFD, the outgoing ray is perpendicular to BCEF, and the incident surface of the ray is parallel to the plane ABC. The ACED on the reverse side is the sensing surface, on which there is a gold film with a thickness of 40-45nm, or a glass plate coated with a gold film with a thickness of 40-45nm after adding a refractive index matching solution. The characteristics of light-excited surface plasmon waves are related to the refractive index outside the gold film, as well as the incident angle and wavelength of incident light.

[0010] right figure 1 If the incident light beam changes Δα in the incident surface relative to the sensing element due to drift, then the incident angle changes Δα, and the impact on the measurement is

[0011] figure 2 Shown is the surface plasmon wave element designed by the present invention, and its structu...

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Abstract

The self-adaptive surface plasma wave gas refractivity sensor includes one triangular prism and one roof prism attached to the outgoing surface of the triangular prism. It is featured by that the incident light to one surface of the triangular prism is reflected by one transducing surface, one roof surface and the reflaction of light goes on till to meet the original incident surface to pass through out. Compared with prior art of surface plasma wave sensor, the present invention has high reflectivity resolution superior to 1E-(-7) and less optical axis drift sensitivity. Theoretical calculation shows that optical axis drift of 1E(-5) arc will result in 1E(-7) refractivity change measured. Therefore, the present invention can raise the relief map stability of the system greatly.

Description

technical field [0001] The invention relates to an adaptive surface plasma wave gas refractive index sensing element, which belongs to the technical field of industrial measurement. Background technique [0002] Using surface plasmon resonance (SPR) technology, high-resolution refractive index sensors can be developed, and specific functional films can be used to selectively enhance the sensitivity of specific molecules, making the measurement resolution Improve dozens of times. Therefore, SPR technology has been widely concerned in the fields of physics, chemistry, biology and industrial applications. At the heart of the SPR sensor is the refractive index sensing element. [0003] The early SPR refractive index sensor mainly used the amplitude characteristics of reflected light, and the resolution of this refractive index sensor was usually within 10 -5 -10 -6 Range of refractive index units. Recent studies have shown that the short-term resolution of SPR refractive in...

Claims

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Application Information

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IPC IPC(8): G01N21/21G01N21/41G01N21/552G02B5/04
Inventor 郭继华殷纯永吴健陈涛
Owner TSINGHUA UNIV
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