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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 8,
  • Issue 4,
  • pp. 188-191
  • (2004)

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

Open Access Open Access

Abstract

A new laser Doppler velocimeter employing a <TEX>$CO_2$</TEX> 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.

© 2004 Optical Society of Korea

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