Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1992-09-04
1993-06-08
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367163, 367174, 181173, 310334, H04R 117
Patent
active
052185753
ABSTRACT:
A flexural mode acoustic transducer system for use in pulse-echo ranging systems has a radiating plate of which even-numbered antinodal zones, counting from a drive connection to a driving element at the center of the plate, are formed with rings of apertures to reduce the radiating areas of those zones, thus reducing cancellation in the far field, and improving the matching of the device to the atmosphere into which the plate is radiating. The plate is backed by a sound deadening layer on a flange of a transducer housing, from which it is separated by a foil which is non-adherent to the plate, and is preferably covered by an acoustically transparent fabric having a pore size small enough to exclude damaging particulates.
REFERENCES:
patent: 3584160 (1971-06-01), Janssen
patent: 3849679 (1974-11-01), Massa
patent: 4056742 (1977-11-01), Tibbetts
patent: 4333028 (1982-06-01), Panton
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patent: 4768615 (1988-09-01), Steinebrunner et al.
patent: 5015929 (1991-05-01), Cathignol et al.
Ultrasonics, Nov. 1978, pp. 267-271, "An Ultrasonic Transducer for High Power Applns. in Gases" Gallego-Juarez et al.
Journal of Sound & Vibration, (1973) 26(3), pp. 411-416, Gallego-Juarez.
The Journal of Acoustic Society of America, 1972, vol. 51, No. 3, Part 2, pp. 953-959, Barone et al.
Eldred J. Woodrow
Milltronics Ltd.
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