Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1998-03-25
2000-12-19
Metiahic, Safet
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324637, G01R 2704
Patent
active
061631582
ABSTRACT:
At least one characteristic, such as the mass/density and/or moisture content and/or dielectric constant, of a substance (such as the rod-like tobacco filler of a continuously advancing cigarette rod or a continuously advancing rod-like filler of filter material for tobacco smoke) is ascertained by an evaluating circuit receiving high-frequency signals from a resonator arrangement which receives microwave signals at least at two different frequencies from one or more microwave generators. The substance is caused to advance through a dielectric resonator of the resonator arrangement, and the high-frequency signals are influenced by the substance. For example, the circuit can compare first and second curves of high-frequency signals which respectively are and are not influenced by a selected substance; the curves can have sloping flanks and each of the two frequencies can be allocated to a sloping flank of a curve. The circuit compares the amplitudes of the curves to ascertain the extent of damping of the output signals due to the presence of a substance at the resonator.
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Hewlett-Packard, "Measuring Dielectric Constant with the HP 8510", product note 8510-3, p.4.
Measuring Dielectric Constant with the HP 8510 Network Analyzer.
Moeller Henning
Noack Andreas
Tobias Joerg
Hauni Maschinenbau AG
Kinberg Robert
Metiahic Safet
Nguyen Jimmy
Spencer George H.
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