Accession Number : ADD005658

Title :   Surface Acoustic Wave Rate Sensor and Position Indicator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Sethares,James C ; Frost,Harold M

Report Date : 21 Nov 1978

Pagination or Media Count : 8

Abstract : Extremely sensitive velocity and position measurements are achieved with a surface acoustic wave (SAW) resonator device. A surface acoustic standing wave field is established on a movable SAW propagation surface by means of induced SAW pulses traveling on the propagation surface and their reflection from a SAW reflecting mechanism. Movement of the propagation surface causes periodic variations in the standing wave field amplitude. The frequency of the standing wave field amplitude variation is directly related to the SAW propagation surface velocity and its phase (i.e., total number of standing wave field amplitude variations from a reference point) indicates the SAW propagation surface position or how far it has moved from the reference point.

Descriptors :   *Patents, *Interferometers, *Transducers, *Resonators, Acoustic reflection, Velocity, Rates, Position(Location)

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE