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Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Kemeny, E. S.
Attorney: Mott; Monte F., Manning; John R., McCaul; Paul F.

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Title: Resolution enhanced sound detecting apparatus

Abstract: Apparatus for enhancing the resolution of a sound detector of the type which includes an acoustic mirror for focusing sound from an object onto a microphone to enable the determination of the location from which the sound arises. The enhancement apparatus includes an enclosure surrounding the space between the mirror and microphone, and containing a gas heavier than air, such as Freon, through which sound moves slower and therefore with a shorter wavelength than in air, so that a mirror of given size has greater resolving power. An acoustically transparent front wall of the enclosure which lies forward of the mirror, can include a pair of thin sheets with slightly pressured air between them, to form an end of the region of heavy gas into a concave shape.

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Inventors: Frosch, Robert A. Administrator of the National Aeronautics and Space (Pasadena, CA, US)
Kendall, James M. (Pasadena, CA, US)

Application Number: 861392
Filing Date: 1977-12-16
Publication_date: 1979-04-10
Assignee:
Primary Class(es): 381/160 181/148, 367/149, 381/165, 381/355
Other Classes:
US Patent Ref:

2155163	Apr, 1939	Gerlach	179/1.
2434666	Jan, 1948	Mason	177/336.
2452068	Oct, 1948	Peterson	340/8.
2770795	Nov, 1956	Peterson	340/8.
3389373	Jun, 1968	Angeloff et al.	340/6.
3895188	Jul, 1975	Ingraham	179/1.

Other Refs: Other References: R. Schlinker et al., "Enhancement of Directional Microphone," AIAA Paper No. 73-1040, Oct. 15, 1973.
F. Grosche et al., "On Aero Acoustic Measurements", AIAA, 1976.
L. Knox, "Underwater Detection", IBM Tech. Discl. Bull., Nov. 1961.