Echo location system which provides for measuring liquid level a

Details Echo location system which provides for measuring liquid level a Echo location system which provides for measuring liquid level a

1977-07-25

1979-03-27

Goldstein, Herbert

Measuring and testing

Liquid level or depth gauge

340 1L, G01F 2328

Patent

active

041459148

ABSTRACT:
A system for the automatic measurement of the level of material in a container and especially of liquid flowing through a channel is described. An echolocation system operates to detect returns of reflected sonic signals from the surface of the liquid in the channel during successive transmission cycles. A source of pulses is provided having a frequency which provides a certain number of pulses corresponding to the travel time of the sonic signals over a distance equal to a maximum predetermined level or head of the liquid in the channel. The time interval between signal transmission and reception in excess of twice the time for travel of the signals between the transmitter and the maximum level of liquid is a measurement of the liquid level in the channel. A first return from a reference reflector disposed in the path of the sonic signals to the surface of the liquid in the channel is utilized in the echolocation system to provide signals for controlling the frequency of the pulses from which the level measurements are obtained. The echolocation system is operative to provide the sonic signals in a burst during a preset interval of time at the beginning of each transmission cycle and to recognize a return as a true return after the same number of signals as was transmitted are detected during a like period of time upon reception. The transmission cycles are repeated each time a sequence of pulses corresponding to the maximum predetermined level is generated, such that the transmission cycles and the measurements are repeated continuously.

REFERENCES:
patent: 2753542 (1956-07-01), Rod et al.
patent: 3394589 (1968-07-01), Tomioka
patent: 3486377 (1969-12-01), Franchi
patent: 4000650 (1977-01-01), Snyder

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