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US4588943A
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US
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Instrument for measuring the moisture content of dielectric objects
Assignee: GANN MESS- U REGELTECHNIK A Co OF GERMANY GmbH
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Filing: 1984-04-06
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Granted: 1986-05-13
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Expires: 2004-04-06
Abstract
Abstract An instrument for measuring the moisture content of dielectric objects has a housing which supports capacitance measuring means. The capacitance measuring means includes a circuit which is connected with a high frequency voltage source and is designed to measure changes in capacitance. The capacitance measuring means further includes an electrically conductive rod which projects from the housing and carries an active electrode at the end thereof remote from the housing. The active electrode is connected with one terminal of the circuit and is designed to generate a diverging voltage field which penetrates into an object undergoing moisture determination. The capacitance measuring means is devoid of an electrode which is capable of cooperating with the active electrode to generate signals during moisture determination. Instead, the second terminal of the circuit is connected with a metallic cover plate which forms part of the housing and constitutes a ground of the latter. The cover plate is designed to be contacted by an operator and thus grounded during moisture determination.
Inventors
- 👤 Friedrich Hirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/226; G01N27/223
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
135 words
An instrument for measuring moisture content, particularly the moisture content of dielectric solids, comprising support means; and capacitance measuring means mounted on said support means and including a capacitance measuring circuit having first and second terminals for connection with respective electrodes which cooperate to cause the generation of measuring signals during moisture determination, said capacitance measuring means further including an active first electrode which is connected with said first terminal and contacts the object whose moisture content requires determination, and said capacitance measuring means being devoid of a cooperating electrode for said first electrode, said second terminal being designed for connection with ground which constitutes a second electrode during moisture determination and cooperates with said first electrode, without touching the object which is contacted by said first electrode, to cause the generation of measuring signals.
Claim 2
Dependent Claim
135 words
An instrument for measuring moisture content, particularly the moisture content of dielectric solids, comprising support means; and capacitance measuring means mounted on said support means and including a capacitance measuring circuit having first and second terminals for connection with respective electrodes which cooperate to cause the generation of measuring signals during moisture determination, said capacitance measuring means further including an active first electrode which is connected with said first terminal and contacts the object whose moisture content requires determination, and said capacitance measuring means being devoid of a cooperating electrode for said first electrode, said second terminal being designed for connection with ground which constitutes a second electrode during moisture determination and cooperates with said first electrode, without touching the object which is contacted by said first electrode, to cause the generation of measuring signals.
Claim 3
Dependent Claim
17 words
The instrument of claim 1, wherein said first electrode at least in part constitutes a measuring capacitor.
Claim 4
Dependent Claim
25 words
The instrument of claim 1, wherein said capacitance measuring means is designed to generate a diverging voltage field in the region of said first electrode.
Claim 5
Dependent Claim
17 words
The instrument of claim 1, wherein said support means comprises a housing which accommodates said measuring circuit.
Claim 6
Dependent Claim
28 words
The instrument of claim 1, wherein said capacitance measuring means projects and has an end remote from said support means, said first electrode being located at said end.
Claim 7
Dependent Claim
19 words
The instrument of claim 1, wherein said first electrode is small relative to an object undergoing moisture determination therewith.
Claim 8
Dependent Claim
44 words
The instrument of claim 1, wherein said capacitance measuring means comprises an elongated, electrically conductive member having a first end which is secured to and a second end which is remote from said support means, said first electrode being mounted at said second end.
Claim 9
Dependent Claim
11 words
The instrument of claim 7, wherein said elongated member is metallic.
Claim 10
Dependent Claim
11 words
The instrument of claim 7, wherein said elongated member is rod-like.
Claim 11
Dependent Claim
12 words
The instrument of claim 1, wherein said first electrode is substantially spherical.
Claim 12
Dependent Claim
13 words
The instrument of claim 1, wherein said first electrode resembles a spherical calotte.
Claim 13
Dependent Claim
12 words
The instrument of claim 1, wherein said first electrode is substantially hemispherical.
Claim 14
Dependent Claim
28 words
The instrument of claim 1, wherein said support means comprises a metallic portion which is connected with said second terminal and constitutes a grounding portion of said instrument.
Claim 15
Dependent Claim
16 words
The instrument of claim 11, wherein said metallic portion comprises a cover for said measuring circuit.
Claim 16
Dependent Claim
10 words
The instrument of claim 14, wherein said cover is plate-like.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |