Laser Doppler Velocimetry Using the Photoacoustic Effect of $CO_2$ Laser

광음향 효과를 이용한 $CO_2$ 레이저 도플러 속도 측정기

  • 최종운 (호남대 공대 정보통신공학과) ;
  • 유문종 (호남대 공대 광통신공학과)
  • Published : 2004.01.01


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 much as 34 KHz was detected, and also a good linear relationship between the velocity and the Doppler frequency shift was obtained.


  1. A. L. S. Smith and S. Moffatt, Optics Comm., 30, 2(1979)
  2. Jitendra P. Gupta and Rajendra N. Sachdev, Appl. Phys. Lett. 36(12), 960 (1980)
  3. Kirk H. Michaelian, 'Photoacoustic Infrared Spectroscopy,' WileyInterscience, 168 (2003)
  4. A. Thony and M. W. Sigrist, Infrared Phys. Technol. Vol. 36, No.2, 585 (1995)
  5. H. W. Jentink, F. F. M. de Mul, H. E. Suichies, J. G. Aarnoudse, and J. Greve, Vol. 27, No. 2, 379(1988)
  6. M. J. Rudd, J. Phys. E 1, 723(1968)
  7. S. Shimohara, A. Mochizuki, H. Yoshida, and Masao Sumi, Applied Optics, 25, 9, 1417(1986)
  8. James H. Churnside, Applied Optics, 23, 1, 61(1984)
  9. Jong-Woon Choi, Young-Pyung Kim, and Youn-Myung Kim, Vol. 68, No. 12, 4623-4624, Review of Scientific Instruments, Dec. (1997)
  10. Jong-Woon Choi, Young-Pyung Kim, and Youn-Myung Kim, US PATENT, 08/689,269 (1996)
  11. R. B. Green, R. A. Keller, G. G. Luther P. K. Schenck, and J C. Travis, Appl, Phys. Lett. 29, 747(1976)
  12. Toyoichi Tanaka, George B. Benedek, Applied Optics, 14, 1(1975)
  13. Photoacoustic Infrared Spectroscopy Kirk H.Michaelian