Measuring and testing – Liquid level or depth gauge
Patent
1992-10-19
1994-06-14
Walsh, Donald P.
Measuring and testing
Liquid level or depth gauge
376252, G01F 2300
Patent
active
053199723
ABSTRACT:
An ultrasonic level measuring system includes a transducer mounted on the bottom of a pipe which launches acoustic pulses up through the pipe wall into the water. The pulses are reflected from the water surface and received by the transducer along with pulses reflected by the pipe wall and reverberations within the pipe wall. The system has a monitor mode in which a variable threshold for the reflected pulses is set by dividing the time after a trigger pulse into time bins and automatically establishing a threshold level for each time bin. In a signal search mode, the time bin containing the liquid level is identified from a histogram recording reflected pulses which exceed the threshold levels for the various time bins. In a normal operating mode, foreground calculations precisely calculating the liquid level in the identified bin alternate with background calculations which reassess the identification of the time bin containing the liquid level. If the bin identified by the background calculation does not agree with the time bin being used by the foreground calculation, the system restarts by returning to the signal search mode. Various system parameters can be easily changed without the need to rewrite code.
REFERENCES:
patent: 4170765 (1979-10-01), Austin et al.
patent: 4221004 (1980-09-01), Combs et al.
patent: 4315325 (1982-02-01), Blades
patent: 4785664 (1988-11-01), Reebs
patent: 4890490 (1990-02-01), Telford
patent: 4933915 (1990-06-01), Bostrom
patent: 5131271 (1992-07-01), Haynes et al.
Dudek Daniel F.
Oblak Tod A.
Smith John R.
Chelliah Meena
Valentine J. C.
Walsh Donald P.
Westinghouse Electric Corp.
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