Variable area flow rate meter using optical sensing of float...

Details Variable area flow rate meter using optical sensing of float... Variable area flow rate meter using optical sensing of float...

2007-03-20

2007-03-20

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S574000, C073S305000, C340S606000

Reexamination Certificate

active

11125500

ABSTRACT:
A flowmeter has a variable area, vertically-oriented duct through which flows fluid whose flow rate is to be determined. A float in the duct assumes a position in the duct that depends on the flow rate of fluid in the duct. A window is located at an end of the duct in alignment with a longitudinal axis of the duct. A transducer unit projects a light beam through the window and along the axis toward the float. The transducer includes a light sensor that detects light returned by the float by reflection or some other mechanism to the transducer unit. The intensity or other characteristic of the returned light indicates the position of the float in the duct, from which the fluid flow rate may be determined.

REFERENCES:
patent: 4732035 (1988-03-01), Lagergren et al.
patent: 4735097 (1988-04-01), Lynnworth
patent: 4873989 (1989-10-01), Einzig
patent: 4947036 (1990-08-01), Pokorski et al.
patent: 5004913 (1991-04-01), Kleinerman
patent: 5178153 (1993-01-01), Einzig
patent: 5257090 (1993-10-01), Meinzer et al.
patent: 5291031 (1994-03-01), MacDonald et al.
patent: 6259516 (2001-07-01), Carter et al.
patent: 6628202 (2003-09-01), McQueen et al.

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