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Record Details

Record 28 of 3088
Acoustic Imaging of Combustion Noise
Author and Affiliation:
Ramohalli, K. N.(CALTECH)
Seshan, P. K.(CALTECH)
Abstract: Elliposidal acoustic mirror used to measure sound emitted at discrete points in burning turbulent jets. Mirror deemphasizes sources close to target source and excludes sources far from target. At acoustic frequency of 20 kHz, mirror resolves sound from region 1.25 cm wide. Currently used by NASA for research on jet flames. Produces clearly identifiable and measurable variation of acoustic spectral intensities along length of flame. Utilized in variety of monitoring or control systems involving flames or other reacting flows.
Publication Date: Dec 01, 1984
Document ID:
19830000547
(Acquired Nov 04, 1995)
Accession Number: 83B10547
Subject Category: PHYSICAL SCIENCES
Report/Patent Number: NPO-15698
Document Type: NASA Tech Brief
Publication Information: NASA Tech Briefs; p. P. 198; (ISSN 0145-319X); 8; 2
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ACOUSTIC MEASUREMENT; AIRCRAFT NOISE; IMAGING TECHNIQUES
Availability Source: National Technology Transfer Center (NTTC), Wheeling, WV
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