Communications: electrical – Selective – Having indication or alarm
Patent
1972-07-10
1976-09-21
Engle, Samuel W.
Communications: electrical
Selective
Having indication or alarm
350 8, H04B 1300
Patent
active
039822230
ABSTRACT:
Composite acoustic lens assemblies which are adapted for use in a fluid medium and utilized for forming acoustic images with incident acoustic waves or focusing incident acoustic waves are constructed utilizing two or more lens elements with a fluid filler medium contained therebetween. In order to reduce the radius of curvature of the lens elements to such an extent that mode conversion at liquid/solid interfaces is substantially eliminated while providing the required image or focusing, the materials of the lens medium and the liquid medium between the lens elements are selected so that the velocity of propagation of acoustic waves in the medium, at least on one side of the composite acoustic lens is intermediate the velocity of propagation of acoustic waves in the media of the lens elements and the fluid filler. In a preferred embodiment, lens elements are selected so that the velocity of propagation of acoustic waves therein is greater than the velocity of propagation of the acoustic waves in the wave transmitting medium surrounding the lens assembly and the lens filler medium is selected so that the velocity of propagation of acoustic waves is less than their velocity in the surrounding wave transmitting medium.
REFERENCES:
patent: 2300251 (1942-10-01), Flint
patent: 2540953 (1951-02-01), Kessler
patent: 2913602 (1959-11-01), Joy
patent: 3516735 (1970-07-01), Goodell
patent: 3620326 (1971-11-01), Hogge
Kock & Harvey, "Refracting Sound Waves," Journal of the Acoustical Society of America, Sept., 1949, pp. 471- 481.
Engle Samuel W.
Faubion Urban H.
Stanford Research Institute
Tudor Harold
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