Accession Number : AD0418558

Title :   ATTENUATION OF ULTRASONIC STRESS WAVES IN CADMIUM SULFIDE CRYSTALS,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Heinrich,George Fred

Report Date : AUG 1963

Pagination or Media Count : 51

Abstract : The velocity and attenuation of pulsed, ultra sonic stress waves in five cadmium sulfide crys tals, three of which were tap effect crystals, were measured at frequencies of 5 and 10 Mc, at temperatures of 77 K and 300 K. The velocity and attenuation measurements were taken while the crystal was irradiated with different, discrete, wavelength light in directions parallel to and perpendicular to the c-axis. The attenuation of the stress waves was proportional to the con ductivity when the stress waves were propagated parallel to the c-axis at 300 K. The attenuation was not a function of the conductivity when the stress waves were propagated perpendicular to the c-axis. The attenuation at 77 K was greater than the attenuation at room temperature. The 300 K attenuation results on all three tap effect crys tals were similar to the results that Truell and Nine obtained on their so-called type B cadmium sulfide crystals. (Author)

Descriptors :   (*STRESSES, WAVE PROPAGATION), (*CRYSTALS, STRESSES), ULTRASONIC PROPERTIES, ULTRASONIC RADIATION, VELOCITY, ATTENUATION, CADMIUM COMPOUNDS, SULFIDES, FREQUENCY, TEMPERATURE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE