Publication Date:
2019-07-12
Description:
Noninvasive technique does not disturb field it measures. Sound field deflects laser beam proportionally to its amplitude. Knife edge intercepts undeflected beam, allowing only deflected beam to reach photodetector. Apparatus calibrated by comparing output of photodetector with that of microphone. Optical technique valuable where necessary to measure in remote, inaccessible, or hostile environment or to avoid perturbation of measured region.
Keywords:
PHYSICAL SCIENCES
Type:
NPO-17565
,
NASA Tech Briefs (ISSN 0145-319X); 13; 9; P. 50
Format:
text
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