Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent
1992-12-02
1994-04-05
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
367167, 367172, 367 96, G01S 1500, H04R 1700
Patent
active
053011708
ABSTRACT:
A device for mounting an ultrasonic transducer on user equipment for operation in a contaminating, ambient environment. A housing has a forwardly extending, profiled inner surface for promoting focusing along an axis of ultrasonic waves emitted by a transducer mounted against a shoulder of the casing. A chamber adjacent to a backside of the transducer is formed by a rearwardly extending portion of the casing and a cap forming an overlap portion therewith. A bladder disposed in the chamber has a port which vents into the overlap portion such that pressure equalization across the transducer is dynamically maintained. A calibrator offset by known displacement from the transducer provides a reflected wave portion to the transducer such that errors caused by temperature dependency of the velocity of propagation of the ultrasonic waves through the ambient environment can be substantially eliminated.
REFERENCES:
patent: 4130018 (1978-12-01), Adams et al.
patent: 4524693 (1985-06-01), McMahon et al.
patent: 4872148 (1989-10-01), Kirby et al.
patent: 4933853 (1990-06-01), Musil et al.
Cedarapids Inc.
Pihulic Daniel T.
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