Paper making and fiber liberation – Apparatus – Measuring – testing – inspecting – indicating or illuminating
Patent
1998-05-26
1999-09-21
Chin, Peter
Paper making and fiber liberation
Apparatus
Measuring, testing, inspecting, indicating or illuminating
162258, 162259, 162DIG6, 162DIG11, 36447102, D21F 106, D21F 108, D21F 706
Patent
active
059549238
ABSTRACT:
An apparatus for sensing three properties of materials: the conductivity or resistance, the dielectric constant, and the proximity of the material to the sensor portion of the apparatus. The apparatus includes a fixed impedance element coupled in series with the sensor portion of the apparatus between an input signal and ground. The sensor portion of the apparatus is an electrode configuration which includes at least two electrodes with a portion of the material residing between and in close proximity to the electrodes. The sensor exhibits a variable impedance resulting from changes in physical characteristics of the material. The fixed impedance element and the variable impedance of the sensor portion form a voltage divider network such that changes in impedance of the sensor portion results in changes in voltage on the output of the apparatus. The variable impedance of the sensor portion relates to changes in property of the material being sensed which can then be related to changes in other physical characteristics of the material such as weight, chemical composition, and temperature.
REFERENCES:
patent: 4845421 (1989-07-01), Howarth et al.
Chase Lee
Goss John
Walford Graham V.
Chin Peter
Honeywell-Measurex Corporation
Leavitt Steven
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