Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1989-02-10
1990-01-30
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
367908, 73290V, G01S 380
Patent
active
048978221
ABSTRACT:
An apparatus for activating and deactivating a bilge pump in a marine vessel in response to the presence or absence of water or other fluid in the bilge area wherein a pair of acoustic transducers are mounted in proximate and opposed relationship to one another such that a first transducer, the generator transducer, transmits acoustic waves to a second transducer, the receiver transducer, across a designated narrow channel. The apparatus operates on the principle that acoustic waves transmit greater energy in a dense transmission medium such as water or other liquid. The sensitivity of the transducer pair and its associated electronic circuitry is adjusted such that the transmitted acoustic signal is detected at the receiver transducer when the signal is transmitted through liquid and the signal fails to reach a detectable level at the receiver transducer when the signal is transmitted through air. The detected signal triggers electronic circuitry operating a relay coil which switches power to the bilge pump. The circuitry of the present invention also incorporates a time delay circuit creating a damping effect on the switching control to prevent switching during sudden movement of water.
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Korten Chauncey F.
Korten Jerome B.
Pihulic Daniel T.
Tarcza Thomas H.
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