Depth of focus in velocity interferometer system for any reflector systems
- Sandia National Laboratories, Albuquerque, New Mexico 87185-5800 (United States)
Velocity interferometer system for any reflector (VISARs) are used to measure the velocity of targets by monitoring the Doppler shift of laser light backscattered from them. In the design of these systems, there is a trade-off between signal-collecting efficiency and depth of focus. We present a VISAR architecture that maximizes the efficiency for any specified depth of focus for velocity sensitivities ranging from 20 m per second per fringe to several kilometers per second per fringe. We consider the usual system where the light going to and from the target is relayed with lenses. We also study fiber optically coupled systems. Our analysis shows that well-designed fiber-coupled systems can be as efficient as the equivalent lens-coupled systems, assuming that the divergence of the fiber-coupled laser beam is small.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7304033
- Journal Information:
- Review of Scientific Instruments; (United States), Vol. 63:5; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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