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US 4,044,607 AGranted
Grain moisture measurement probe
AssigneeElectromeasures, Inc.
InventorClarence D. Deal
Life of this patent
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Abstract
An apparatus for measuring the moisture content of grain includes a probe having an oscillator circuit therein. The oscillator circuit includes a function generator, temperature sensing means in contact with the grain and a pair of juxtapositioned capacitor electrodes within the probe, but not in contact with the grain. The output of the oscillator circuit is connected to readout means including a phase locked loop, operational amplifier and indicating means.
Claims11
A moisture measuring apparatus comprising:
- a. a probe for insertion into material to be measured, having a housing of dielectric material;
- b. means for generating a divergent electrostatic field substantially symmetrical about the probe housing and having a major portion thereof extending externally of the housing, said means including a pair of capacitance electrodes disposed within said probe physically isolated by said housing from the material to be measured,
- c. a frequency generating circuit including said electrodes, said frequency generating circuit providing an output signal having a frequency dependent upon the capacitance between said electrodes, and
- d. readout means connected to receive said output signal.
1 more element
Dependencies are inferred from the claim text.