Measuring and testing – Liquid level or depth gauge
Patent
1974-10-29
1976-10-12
Farley, Richard A.
Measuring and testing
Liquid level or depth gauge
340 1L, 340 3E, G01F 2328, G01S 968
Patent
active
039850307
ABSTRACT:
An ultrasonic acoustic pulse echo ranging system for monitoring the depth of liquid in a tank has transmitter and receiver transducers for mounting side-by-side in an upwardly directed disposition and exposed to the liquid at a datum level. A transmitter and receiver are adapted for coupling to the transducers from outside the tank. The transmitter includes an ultrasonic frequency oscillator for energizing the transmitter transducer to transmit acoustic pulses of the ultrasonic frequency, a gate to start the oscillator, a continuously cycling counter coupled with and effective to actuate the gate to start the oscillator at the start of each counting cycle, a regulator to stop the oscillator to determine the length of each transmitted acoustic pulse in terms of the number of cycles of the ultrasonic frequency in the pulse. The receiver is arranged to detect outputs from the receiver transducer and to generate output pulses in response to echoes of the acoustic pulses from the free surface of the liquid. A display device, and latching means responsive to the output pulse of the receiver to connect the counter to the display device to display a measure of the time interval between the transmission of an acoustic pulse and the detection of its echo. The regulator includes a regulating counter of the ultrasonic cycles which is resettable at zero by the stopping of the oscillator, and a count comparator, which is coupled to the latching means, to determine that the regulator is responsive to variations between successive measured time intervals to regulate in the sense of the variations, the length of the next transmitted pulse.
REFERENCES:
patent: 2775748 (1956-12-01), Rod et al.
patent: 3084331 (1963-04-01), Dudley
patent: 3469261 (1969-09-01), Lambert, Jr. et al.
Farley Richard A.
William McGeoch & Company
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