Self-mixed intervention Doppler velometer based on two-frequency laser |
Title： |
| Self-mixed intervention Doppler velometer based on two-frequency laser |
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Application Number： |
200410009261 |
Application Date： |
2004/06/25 |
Announcement Date： |
2005/03/16 |
Pub. Date： |
2007/08/22 |
Publication Number： |
1595170 |
Announcement Number： |
1333258 |
Grant Date： |
2007-8-22 |
Granted Pub. Date： |
2007-8-22 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G01P 3/36, G01S 17/58, H01S 3/13 |
Applicant(s)： |
Tsinghua University |
Inventor(s)： |
Liu Gang, Zhang Shulian, Zhu Jun |
Key Words： |
Self-mixed intervention, Doppler velometer, two-frequency laser |
Abstract： |
It is a Doppler velocimeter based on self-mixed intervention effect and belongs to laser measurement field, which comprises light source, measurement part and signal process three parts. The system light source uses double-frequency laser and locates a quarter of wave sheet in the system measurement part, that is system outer chamber, wherein, the light beam moves around in the outer chamber for once and makes the polarization direction turned into the original vertical direction. As to the velocimeter, when there is no Doppler frequency shift, the laser power spectrum has only one spectrum line; when there exists Doppler frequency shift, the power spectrum has two original spectrum lines and the differential value between the two spectrum lines relative beat frequency signals represents the velocity direction and the distance between the two spectrum lines is converted into velocity. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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