Accession Number : ADD013901

Title :   Acoustic Charge Transport Processor.

Descriptive Note : Patent Application, Filed 27 Oct 88,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Ballato, Arthur

Report Date : 27 Oct 1988

Pagination or Media Count : 21

Abstract : An acoustic charge transport (ACT) device is easily constructed to provide for variable carrier frequency operation or, alternatively, for variable time delays. Variable carrier frequency operation in an ACT device is achieved by incorporating a two dimensional dispersive transducer array which has an interdigitated finger arrangement. This array has a graded periodicity or finger spacing that varies along the length of the array and also has the fingers placed at a 45 degree angle with respect to the length of the array. Because of the varying spacing of the electrode fingers, different spatial regions in the piezoelectric substrate are preferentially excited reflecting the presence of specific frequency components in an applied input signal. A variable time delay is similarly achieved in an ACT device by incorporating a two dimensional interdigital transducer array having fingers with a graded periodicity. The finger spacings in this transducer array are placed at a 90 degree angle with respect to the length of the array. By simply changing the frequency of the input signal in the selected ACT device, variable carrier frequency operation and variable time delays are provided. Patent applications. (rh)

Descriptors :   *ACOUSTIC EQUIPMENT, *ACOUSTICS, *CHARGE TRANSFER, *DELAY, *ELECTRODES, *FREQUENCY, *PATENT APPLICATIONS, *PROCESSING EQUIPMENT, *TRANSDUCERS, AIRCRAFT CARRIERS, ARRAYS, CARRIER FREQUENCIES, FINGERS, INPUT, LENGTH, NAVAL OPERATIONS, PIEZOELECTRIC MATERIALS, REGIONS, SIGNALS, SPATIAL DISTRIBUTION, SUBSTRATES, TIME INTERVALS, VARIABLES

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE