Surface Acoustic Wave Rate Sensor and Position Indicator.
DEPARTMENT OF THE AIR FORCE WASHINGTON D C
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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.
- Test Facilities, Equipment and Methods
- Acoustic Detection and Detectors
- Optical Detection and Detectors