Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1993-07-16
1994-08-09
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367908, 340612, 340617, 340621, 73620, 73621, 73625, H04R 1700
Patent
active
053372891
ABSTRACT:
A real time ultrasonic surface contour mapping system is provided including a digitally controlled phased-array of transmitter/receiver (T/R) elements located in a fixed position above the surface to be mapped. The surface is divided into a predetermined number of pixels which are separately scanned by an arrangement of T/R elements by applying phase delayed signals thereto that produce ultrasonic tone bursts from each T/R that arrive at a point X in phase and at the same time relative to the leading edge of the tone burst pulse so that the acoustic energies from each T/R combine in a reinforcing manner at point X. The signals produced by the reception of the echo signals reflected from point X back to the T/Rs are also delayed appropriately so that they add in phase at the input of a signal combiner. This combined signal is then processed to determine the range to the point X using density-corrected sound velocity values. An autofocusing signal is developed from the computed average range for a complete scan of the surface pixels. A surface contour map is generated in real time form the range signals on a video monitor.
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Fasching George E.
Smith, Jr. Nelson S.
Breeden David E.
Eldred J. Woodrow
Hamel Stephen D.
Moser William R.
The United States of America as represented by the Department of
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