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Wavelength-modulated polarized surface plasma wave sensor

A technology of surface plasmon and wavelength modulation, which is applied in the direction of instruments, scientific instruments, and polarization-influenced characteristics, can solve the problems of high sensor noise, zero sensitivity, and non-zero sensitivity, and achieve the effect of improving resolution and reducing impact

Inactive Publication Date: 2002-04-03
TSINGHUA UNIV
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Problems solved by technology

And applied for a patent, the application number is 98124488.2, the disadvantage of this technology is that the background of the DC light intensity at the working point is theoretically not zero, (if it is zero, the sensitivity is also zero)
Since the white noise is proportional to the square root of the DC light intensity, the noise of the sensor is relatively large

Method used

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  • Wavelength-modulated polarized surface plasma wave sensor
  • Wavelength-modulated polarized surface plasma wave sensor
  • Wavelength-modulated polarized surface plasma wave sensor

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Embodiment Construction

[0010] Such as figure 2 As shown, the wavelength modulation polarization type surface plasmon wave sensor designed by the present invention includes a laser, a polarizer, a sensing component, a 1 / 4 wave plate, a polarizer, a photoelectric converter, a lock-in amplifier, a computer and a signal generation The laser light generated by the laser becomes linearly polarized light after passing through the polarizer, and the linearly polarized light is incident on the light reflecting surface of the sensor component, and the reflected outgoing light becomes left-handed and right-handed after passing through the 1 / 4 wave plate Circular polarized light, the circular polarized light becomes linearly polarized light through the analyzer, the linearly polarized light is converted into an electrical signal by the photoelectric converter, the electrical signal is input into the computer after the lock-in amplifier, the measurement result is displayed, and the signal generator sends out a s...

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Abstract

A wavelength-modulating polarized surface plasma sensor is composed of laser device, polarizer, sensing part, 1 / 4 wave plate, analyzer, photoelectric converter, phase-locked amplifier, computer and signal generator. The laser beam is converted to linear polarized beam by polarizer and them going to reflection surface of sensing part. The reflected beam is converted to left-hand turning and right-hand turning circular polarized beams by 1 / 4 wave plate; then the beams are converted to linear polarized beam by analyzer. After it is converted to electric signal, it is outputted to computer via phase-locked amplifier to display result. The signals from signal generator are used for modulating the wavelength of laser beam while inputting it to phase-locked amplifier for demodulating it. Its advantages are low hite noise and high resolution.

Description

technical field [0001] The invention relates to a wavelength modulation polarization surface plasma wave sensor, which belongs to the technical field of industrial testing. Background technique [0002] Surface plasmon wave sensor [Surface Plasmon Resonance sensor referred to as SPR sensor in English] Although it is called SPR sensor according to the custom, it is actually an SPR test instrument integrating optomechanical electronics. The instrument is mainly used for research on the characteristics of thin film systems in the fields of physics, chemistry and biology. Especially in the fields of biomembrane engineering, cell structure, membrane chemistry and other fields, it has broad prospects. [0003] The mechanism of the SPR sensor is the P-wave resonant laser surface plasmon wave, and its reflection coefficient Very sensitive to the refractive index of the medium near the excitation surface. The change in the refractive index can be determined by measuring the prope...

Claims

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Application Information

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IPC IPC(8): G01N21/21G01N21/27G01N21/552
Inventor 郭继华孙家林许小楠李复
Owner TSINGHUA UNIV
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