Laser Doppler velocimeter with optical frequency shifting
article
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.
TNO Identifier
227498
ISSN
00303992
Source
Optics and Laser Technology, 5(6), pp. 249-252.
Pages
249-252
Files
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