Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1981-09-01
1983-10-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324132, G01R 2702, G01R 1510
Patent
active
044081286
ABSTRACT:
A wide range electric resistance type moisture meter is disclosed wherein a current flowing through a sample such as grain or wood is scaled by a load resistor and a feedback resistor of an operational amplifier to derive a scaled current which is proportional to the sample current, and the scaled current is current-voltage logarithmic-converted by a logarithmic conversion circuit including another operational amplifier connected to the output of the first-mentioned operational amplifier and diodes, so that a moisture content indicating voltage is linearized even in a high moisture content range. The output of the logarithmic conversion circuit is processed by an operation circuit to produce the moisture content and temperature compensated and the resulting moisture content is indicated by a moisture content indicator.
REFERENCES:
patent: 3961247 (1976-06-01), Toki
patent: 3971984 (1976-07-01), Bench
patent: 4065682 (1977-12-01), Evans
Kett Electric Laboratory
Krawczewicz Stanley T.
Solis Jose M.
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