Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Reexamination Certificate
2005-01-11
2005-01-11
Sotomayor, John B. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
C342S175000, C342S205000
Reexamination Certificate
active
06842139
ABSTRACT:
A separation frequency detector circuit and a method for detection of a separation frequency in a radar level gauge. A first circuit element (1) is arranged to receive a first clock frequency, and a second clock frequency. An instantaneous value of the first clock frequency will be transferred to and held at an output Q of the first circuit element (1) once each period of the second clock frequency. A predetermined value will be transferred to and held at an output Q of a second circuit element (3) triggered by the output Q of the first circuit element (1), and the predetermined value will be cleared from the output Q of the second circuit element (3) a predetermined time period after being triggered. An output is obtainable as a short pulse with a leading edge which will be synchronized with the first change of the leading signal edge of the first circuit element (1).
REFERENCES:
patent: 4135397 (1979-01-01), Krake
patent: 6072427 (2000-06-01), McEwan
patent: 6137438 (2000-10-01), McEwan
patent: 6300897 (2001-10-01), Kielb
patent: 6452467 (2002-09-01), McEwan
patent: 6628229 (2003-09-01), Johnson et al.
Alsomiri Isam
Saab Rosemount Tank Radar AB
Sotomayor John B.
Westman Champlin & Kelly P.A.
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