Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent
1991-03-27
1994-03-15
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
367908, G01S 1508, H04R 100
Patent
active
052951200
ABSTRACT:
There is provided a hermetically sealed dry-coupled transducer apparatus and system adapted for improved measuring of liquid level in a pipe or vessel, or for other instrumentation applications. The transducer system is characterized by having a hermetic seal at the junction of an acoustic window 33' and an outer shell 31' (thereby hermetically sealing a forward aperture of the outer shell), and a thin, compliant, threaded cap 46 enclosing a rearward aperture of the outer shell. The cap provides means for repetitively assembling and disassembling the transducer module, if necessary, prior to welding. In addition, a push rod applies acoustic coupling force to a piezoelectric transducer element to effect dry coupling to a surface, while the compliant cap prevents significant force transmission to the shell. The system exhibits limited reverberation and, moreover, is suitable for use in high-temperature environments.
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Pihulic Daniel T.
Valentine J. C.
Westinghouse Electric Corp.
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