Accession Number : ADP002999

Title :   Signal Processing with SAW (Surface Acoustic Wave) Devices,


Personal Author(s) : White,R. M.

Report Date : AUG 1976

Pagination or Media Count : 6

Abstract : During the previous report period a surface acoustic wave (SAW) filter was designed and constructed having a response inverse to that of a simulated NDT system. (Some of the data taken on this filter were included in the 1974-5 annual report.) Further testing of this filter was undertaken at the beginning of this period with the aim of characterizing the filter more accurately. A redesign of the filter to include an input transducer having less loss was then carried out. It appears that the use of a two-pair or three-pair input IDT is advantageous, and a filter incorporating such a transducer is now being fabricated for use with the simulated NDT system (5 MHz PZT transducer cemented onto an aluminum block). With this filter, determination is to be made of all the relevant electrical characteristics, as well as determination of the minimum spatial resolution obtainable at the filter output when two closely-spaced impedance discontinuities produce reflections.

Descriptors :   *Nondestructive testing, *Surface acoustic wave devices, Signal processing, Acoustic filters, Transducers, Input, Experimental design

Distribution Statement : APPROVED FOR PUBLIC RELEASE