Phase-modulated polarized surface plasma wave sensor |
Title： |
| Phase-modulated polarized surface plasma wave sensor |
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Application Number： |
01136668 |
Application Date： |
2001/10/26 |
Announcement Date： |
2002/04/03 |
Pub. Date： |
2004/02/25 |
Publication Number： |
1342894 |
Announcement Number： |
1139799 |
Grant Date： |
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Granted Pub. Date： |
2004-2-25 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G01N 21/21, G01N 21/27, G01N 21/55, G02F 1/09 |
Applicant(s)： |
Qinghua Univ |
Inventor(s)： |
Guo Jihua, Sun Jialin, Zhuo Wenjiang |
Key Words： |
Phase-modulated, polarized, surface plasma wave, sensor |
Abstract： |
A phase-modulating polarized surface plasma sensor is disclosed. The laser beam from laser device is converted to linear polarized light by polarizer, and then going to the reflection surface of sensing part. The reflected light is converted to left-hand turning and right-head turning circular polarized beams by 1/4 wave plate, here the lights are then converted to linear polarized beam by analyzer. After the linear polarized beam is converted to electric signal, with the beams phase-locked and amplified, it is outputted to computer to display result. The signal generator sends signal to phase modulator where the phase difference between P wave and S wave is modulated and demodulated by phase-locked amplifier. Its advantages are zero DC background light and high resolution. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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