发明名称 |
Method of and apparatus for ascertaining at least one characteristic of a substance |
摘要 |
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 n ot 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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申请公布号 |
US2001000946(A1) |
申请公布日期 |
2001.05.10 |
申请号 |
US20000734616 |
申请日期 |
2000.12.13 |
申请人 |
MOELLER HENNING;TOBIAS JOERG;NOACK ANDREAS |
发明人 |
MOELLER HENNING;TOBIAS JOERG;NOACK ANDREAS |
分类号 |
A24C5/34;G01N22/00;(IPC1-7):G01R27/32 |
主分类号 |
A24C5/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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