Wavelength-modulated polarized surface plasma wave sensor
Title：
Wavelength-modulated polarized surface plasma wave sensor
Application Number：
 01136673
Application Date：
 2001/10/26
Announcement Date：
 2002/04/03
Pub. Date：
 2004/02/25
Publication Number：
 1342895
Announcement Number：
 1139800
Grant Date：
Granted Pub. Date：
 2004-2-25
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G01N 21/21, G01N 21/27, G01N 21/55
Applicant(s)：
 Qinghua Univ
Inventor(s)：
 Guo Jihua, Sun Jialin, Xu Xiaonan
Key Words：
 Wavelength-modulated, polarized, surface plasma wave, sensor
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.
Claim：
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