Accession Number : AD0282754

Title :   IMPROVED DELAY LINE TECHNIQUES

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : TEHON,S.W. ; ROBERTS,R.C. ; WANG,W.C.

Report Date : JUN 1962

Pagination or Media Count : 1

Abstract : Results are presented of a continued program on delay line development. Work concerned the two major areas of dispersive ultrasonic delay lines, and of thin ferroelectric ceramic sheet lines. Ceramic sheet lines were studied theoretically and experimentally, and a number of novel configurations are presented. Ceramic sheet lines offer the possibility of building ultrasonic delay lines with relatively small time delay - bandwidth products having large numbers of taps. Tap spacing can be made less than the resolution time, and transducer reflections are minimal because transducers and delay path utilize the same material, with the same acoustic impedance and with no intermediate bonds. Time bandwidth product is limited at present by attenuation in ferroelectric ceramic materials suited to this application. One application is described, which provides an ultrasonic means for scanning an image area to provide a raster suitable for television cameras or image display. Dispersive delay line development continued from a previous RADC program. Bandwidths and operating frequencies were increased substantially, strip configurations were developed, and practical lines suitable for pulse compression systems were built, both in breadboard form and in finished packages suitable for system use. The results of operation in a laboratory pulse compression system are presented. (Author)

Descriptors :   *DELAY LINES, *PIEZOELECTRIC TRANSDUCERS, ATTENUATION, CERAMIC MATERIALS, DISPLAY SYSTEMS, FERROELECTRIC MATERIALS, POLARIZATION, RADAR PULSES, SOUND, SOUND TRANSMISSION, TELEVISION CAMERAS

Distribution Statement : APPROVED FOR PUBLIC RELEASE