Measuring and testing – Liquid level or depth gauge
Patent
1995-01-27
1998-11-10
Dombroske, George M.
Measuring and testing
Liquid level or depth gauge
73304C, 340562, G01F 2300
Patent
active
058327720
ABSTRACT:
A level detector or proximity detector for materials capable of sensing through plastic container walls or encapsulating materials is of the sensor. Thus, it can be used in corrosive environments, as well as in a wide variety of applications. An antenna has a characteristic impedance which depends on the materials in proximity to the antenna. An RF oscillator, which includes the antenna and is based on a single transistor in a Colpitt's configuration, produces an oscillating signal. A detector is coupled to the oscillator which signals changes in the oscillating signal caused by changes in the materials in proximity to the antenna. The oscillator is turned on and off at a pulse repetition frequency with a low duty cycle to conserve power. The antenna consists of a straight monopole about one-quarter wavelength long at the nominal frequency of the oscillator. The antenna may be horizontally disposed on a container and very accurately detects the fill level within the container as the material inside the container reaches the level of the antenna.
REFERENCES:
patent: 3641544 (1972-02-01), Radin
patent: 3697971 (1972-10-01), Domin et al.
patent: 3732538 (1973-05-01), Gillund et al.
patent: 3733597 (1973-05-01), Healey et al.
patent: 3743865 (1973-07-01), Riechmann
patent: 3801799 (1974-04-01), Atkins
patent: 3807231 (1974-04-01), Spaw
patent: 3973208 (1976-08-01), Diamond
patent: 4002996 (1977-01-01), Klebanoff et al.
patent: 4099167 (1978-07-01), Pomerantz et al.
patent: 4144529 (1979-03-01), Miller et al.
patent: 4173755 (1979-11-01), Bulter
patent: 4325058 (1982-04-01), Wagner et al.
patent: 4345167 (1982-08-01), Calvin
patent: 4371790 (1983-02-01), Manning et al.
patent: 4729245 (1988-03-01), Hansman, Jr.
patent: 4829449 (1989-05-01), Polesnak
patent: 5012683 (1991-05-01), Davis
patent: 5083470 (1992-01-01), Davis et al.
patent: 5184500 (1993-02-01), Krema et al.
patent: 5245295 (1993-09-01), Hata et al.
patent: 5337039 (1994-08-01), Simon
patent: 5380983 (1995-01-01), Cavada et al.
patent: 5486815 (1996-01-01), Wagner
patent: 5559484 (1996-09-01), Nowicki et al.
Amrozowicz Paul D.
Dombroske George M.
Sartorio Henry P.
The Regents of the University of California
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