Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Reexamination Certificate
2005-04-12
2005-04-12
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
C342S145000
Reexamination Certificate
active
06879282
ABSTRACT:
A guided wave radar measurement instrument comprises a probe defining a guided wave radar transmission line. A pulse circuit is connected to the probe for generating a very fast stream of pulses on the transmission line and receiving reflected pulses returned on the transmission line. The reflected pulses represent a characteristic of a material being measured. An equivalent time sampling circuit is connected to the pulse circuit operable to sample reflected pulses to build a time multiplied picture of the reflected pulses and comprises a ramp generator circuit generating a saw tooth ramp signal used to selectively delay sampling reflected pulses to build the time multiplied picture. In one aspect of the instrument, the saw tooth ramp signal has a controlled ramp start for each cycle and retrace at an end of the cycle. A processing circuit is connected to the equivalent time sampling circuit for selectively controlling ramp start for each cycle and measuring round trip travel time for a pulse from the pulse circuit.
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DKE Deutsche Kommission Elektrotechnik Electronik Informationstechnik im DIN und VDE, “Electrical apparatus for potentially explosive atomospheres—Intrinsic safety” European Standard EN 50020, “Standard for Intrinsic Safety”, 1994, pp. 22 and 25-27.
Alsomiri Isam
Magnetrol International Incorporated
Tarcza Thomas H.
Wood Phillips Katz Clark & Mortimer
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