Accession Number : AD0612703

Title :   ACTIVE ACOUSTIC DEVICES.

Descriptive Note : Interim rept. for 17 Jun-30 Sep 64,

Corporate Author : MOTOROLA INC PHOENIX ARIZ SEMICONDUCTOR PRODUCTS DIV

Personal Author(s) : Brendecke,W. H.

Report Date : FEB 1965

Pagination or Media Count : 31

Abstract : Investigations of the six major transducer types were initiated to determine the feasibility of using each type in continuous wave (CW) devices. The most promising is the thin film transducer due to the close control of geometric factors. Exact control over placement, size and thickness can be achieved through selective masking and process deposition rates. Mechanical polishing limits the bonded quartz transducer to a maximum frequency of 175 mc/sec. Compensated region transducers with 2 to 3 db loss have been constructed between 10 and 30 mc/sec. The difficult growth process will limit epitaxial transducers to very preliminary experiments. Depletion layer transducers will be eliminated from further investigations due to the inability of II-VI compounds to form p-n junctions. (Author)

Descriptors :   (*TRANSDUCERS, SEMICONDUCTOR DEVICES), (*ACOUSTIC EQUIPMENT, SEMICONDUCTOR DEVICES), (*SEMICONDUCTOR DEVICES, TRANSDUCERS), ELECTROACOUSTIC TRANSDUCERS, FILMS, VAPOR PLATING, VACUUM APPARATUS, CADMIUM COMPOUNDS, SULFIDES, EPITAXIAL GROWTH, PIEZOELECTRIC CRYSTALS, QUARTZ, RADIOFREQUENCY AMPLIFIERS, ULTRASONIC PROPERTIES, SURFACE PROPERTIES, RESONANCE, ZINC COMPOUNDS, OXIDES, VERY HIGH FREQUENCY, ULTRAHIGH FREQUENCY, SOLID STATE PHYSICS, BROADBAND, PHONONS, ENERGY CONVERSION

Distribution Statement : APPROVED FOR PUBLIC RELEASE