| Title |
Laser Doppler Velocimetry Using the Photoacoustic Effect of CO_2 Laser |
| Keywords |
레이저 photoacoustic ; Doppler ; CO_2 |
| 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 much as 34 KHz was detected, and also a good linear relationship between the velocity and the Doppler frequency shift was obtained. |