Laser Doppler velocimetry based on the optoacoustic effect in a RF-excited CO2 laser

We present a compact optoacoustic laser Doppler velocimetry method that utilizes the self-mixing effect in a RF-excited CO2 laser. A portion of a Doppler-shifted laser beam, produced by irradiating a single wavelength laser beam on a moving object, is mixed with an originally existing laser beam ins...

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Bibliographic Details
Published in:Review of scientific instruments 2012-09, Vol.83 (9), p.093101-093101
Main Authors: Lee, Teaghee, Choi, Jong Woon, Kim, Yong Pyung
Format: Article
Language:English
Subjects:
Carbon dioxide
Doppler
Doppler effect
Laser beams
Laser cavities
Lasers
Velocimetry
Velocity measurement
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Summary:We present a compact optoacoustic laser Doppler velocimetry method that utilizes the self-mixing effect in a RF-excited CO2 laser. A portion of a Doppler-shifted laser beam, produced by irradiating a single wavelength laser beam on a moving object, is mixed with an originally existing laser beam inside a laser cavity. The fine change of pressure in the laser cavity modulated by the Doppler-shifted frequency is detected by a condenser microphone in the laser tube. In our studies, the frequency of the Doppler signal due to the optoacoustic effect was detected as high as 50 kHz. Our measurements also confirmed that the signal varied linearly with the velocity of the external scatterer (the moving object) and the cosine of the angle between the laser beam and the velocity vector of the object.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4750429