Fluid level detection using RF

Details Fluid level detection using RF Fluid level detection using RF

2005-11-07

2008-12-02

Williams, Hezron E. (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Reexamination Certificate

active

07458260

ABSTRACT:
The present disclosure includes systems and techniques relating to fluid level detection. In general, in some implementations, a fluid level detector includes a radio frequency transmitter, and a plurality of radio frequency detectors arranged to receive radio frequency signals from the radio frequency transmitter when above a fluid level. The radio frequency transmitter and one or more multiple transmitting antennas can be configured to transmit ultra high frequency (UHF) RF signals. The radio frequency detectors can be radio frequency antennas, and the fluid level detector can include circuitry configured to receive signals from the radio frequency antennas. For example, the circuitry can include a decode array (e.g., a two dimensional diode array) coupled with the antennas, and a decoder (e.g., digital logic) coupled with the decode array.

REFERENCES:
patent: 2869108 (1959-01-01), Smith, Jr.
patent: 4119860 (1978-10-01), Gooley
patent: 5842374 (1998-12-01), Chang
patent: 6959598 (2005-11-01), Peterson et al.
patent: 7219545 (2007-05-01), Salzmann et al.
patent: 7270001 (2007-09-01), Betz

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