Measuring and testing – Liquid level or depth gauge
Patent
1980-07-02
1983-08-30
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
73632, 367 99, G01F 2328, G01N 2900
Patent
active
044009763
ABSTRACT:
An improved transceiver for use in ultrasonic echo-ranging systems is disclosed together with a system for its use. The transceiver comprises a capacitor to store power received from a central location during an inactive mode, and switching means to disconnect the capacitor from the power supply during the active mode. The capacitor is used both to supply power to an electrostatic transducer to generate an ultrasonic pulse and also to provide a noise free bias voltage to the transducer to enable it to receive the reflected pulse. An amplifier is provided as part of the transceiver so that long transmission lines between transceiver and controller are possible without undue noise. The power supply line can also be used as the signal transmission line and can be provided in a simple two-wire shielded cable, the other wire being used for logic level control signal transmission, thus allowing simplified multiplexing of a plurality of transceivers.
REFERENCES:
patent: 2167492 (1939-07-01), Sproule
patent: 3526821 (1970-09-01), Thomas
patent: 3589196 (1971-06-01), Van Dyck
patent: 3834233 (1974-09-01), Willis et al.
patent: 3874236 (1975-04-01), Reck
patent: 4114457 (1978-09-01), Thun
patent: 4221004 (1980-09-01), Combs et al.
patent: 4222113 (1980-09-01), Hansen
PureCycle Corporation
Yasich Daniel M.
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