Laser Doppler velocimeter with optical frequency shifting |
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| Authors: | J Oldengarm A H van Krieken H J Raterink |
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| Institution: | The authors are with the Institute of Applied Physics TNO-TH, POB 155, Delft, The Netherlands |
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| Abstract: | A bi-directional laser Doppler velocimeter utilizing optical frequency shifting has been developed. Optical frequency shifting is achieved by using a rotating radial grating. A high diffraction efficiency permits the system to be used in the fringe mode. The zero velocity frequency shift can be varied from 0.1 to 2.5 MHz with a stability better than 0.2%. Important applications are velocity measurements in reversing flows, highly turbulent flows, two-phase flows, and boundary layers. The system described may also be used for vibration analysis. Experimental results are presented. |
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