Accession Number : AD0642807

Title :   GENERATION AND DETECTION OF COHERENT ELASTIC WAVES IN QUARTZ AT 114,000 MC/SEC.

Descriptive Note : Final rept., 1963-6,

Corporate Author : ROCHESTER UNIV N Y DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Jacobsen,E. H. ; Ilukor,J.

Report Date : OCT 1966

Pagination or Media Count : 14

Abstract : Coherent elastic waves have been generated and detected at 114,000 megacycles per second in crystalline quartz at liquid-helium temperatures. A low-power klystron and superhetrodyne receiver with synchronous detector were used as transmitter and receiver, respectively. Measurements of attenuation vs. temperature suggest that acoustic losses proceed via the three phonon process. Effective power input to the cavity was approximately 3 milliwatts because of large wave guide losses at these frequencies. The general results suggest the feasibility of similar experiments, employing the piezoelectric effect, at considerably higher frequencies. (Author)

Descriptors :   (*MECHANICAL WAVES, MILLIMETER WAVES), (*QUARTZ, MECHANICAL WAVES), CRYOGENICS, PIEZOELECTRIC EFFECT, ATTENUATION, MEASUREMENT, EXTREMELY HIGH FREQUENCY

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE