Publication Date:
2019-07-12
Description:
Interference fringes remain parallel and focus-spot diameter same. Scanning system proposed for laser velocimeter (laser Doppler anemometer) to maintain constant beam-crossing angle and beam-waist diameter maintaining beam waist locations at crossing points. As target fluid scanned, interference fringes formed by crossing beams remain parallel and the focus-spot diameter same. System allows accurate velocity profiles obtained in wind tunnels and other fluid flow systems.
Keywords:
PHYSICAL SCIENCES
Type:
ARC-11547
,
NASA Tech Briefs (ISSN 0145-319X); 11; 5; P. 33
Format:
text
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