NASA NTRS · 19880004968
Dual mode laser velocimeter
Abstract
Described is a laser Doppler velocimeter (LDV) which is capable of operating with a small focus diameter for analyzing fluid flows at low velocity with high spatial resolution, or with a larger focus diameter to measure fluid flows at higher velocities accurately. More particularly, this is an LDV in which a simple reversal of a lens pair will allow it to operate in the two focus diameter modes.
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Gunter, William D., Jr., Donaldson, Ralph W., Anderson, Alma G., Jr.. 1987-10-06. Dual mode laser velocimeter. https://ntrs.nasa.gov/citations/19880004968
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