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http://dx.doi.org/10.3807/JOSK.2004.8.4.188

Photoacoustic Laser Doppler Velocimetrv Using the Self - mixing Effect of RF - excited CO2 Laser  

Choi, Jong-Woon (Department of Information and Communication, Honam University)
You, Moon-Jong (Department of Information and Communication, Honam University)
Choi, Sung-Woong (Radio Resources Research Team, Electronics and Telecommunication Research Institute)
Woo, Sam-Young (Mass & Force group, Division of Physical Metrology, Korea Research Institute of Standards and Science)
Publication Information
Journal of the Optical Society of Korea / v.8, no.4, 2004 , pp. 188-191 More about this Journal
Abstract
A new laser Doppler velocimeter employing a $CO_2$ laser has been developed by using its photoacoustic effect. A change in the pressure of a discharge, induced by mixing of a returned wave with an originally existing wave inside the cavity, is employed to detect the Doppler frequency shift. We found that a Doppler frequency shift as small as 50 kHz was detected, and also a good linear relationship between the velocity and the Doppler frequency shift was obtained.
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