US3694737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave moisture sensing system and method
Assignee: Beloit Corp
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Filing: 1970-08-03
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Granted: 1972-09-26
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Expires: 1990-08-03
Abstract
Abstract An apparatus for measuring the amount of moisture in a sample which is generally formed of a microwave energy source, a microwave radiating element connected to the source, a microwave energy receiving element, and a microwave energy indication connected to the receiving element. The sample is positioned between the radiating and receiving elements and a structure is provided for changing the energy transmission path through the sample by at least one-half wavelength of the microwave energy. Such means may take the form of a frequency modulator connected to the source, a dielectric disc in the transmission path, or a structure for continuously changing the distance between the radiating element and the sample or combination of these means.
Inventors
- 👤 Leroy H Busker
- 👤 Robert J Mosher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:54
CPC Classifications
G; G01; G01N; G01N22/00; G01N22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
248 words
Apparatus for measuring the amount of moisture in a sample in the form of a web, comprising: a source of microwave energy; a microwave energy radiating element connected to said source and positioned adjacent one edge of said web to impinge microwave energy on one side of said web; a microwave energy receiving element positioned adjacent the other edge of said web to receive microwave energy emanating from the other side of the sample and aligned with said radiating element so that they are laterally offset from each other relative to the web; a microwave energy indicator connected to said receiving element and said sample being in the form of a web with its transverse dimension lying generally in a plane which makes an acute angle with a line extending between said radiating and receiving elements such that energy enters generally from one side of the web adjacent one edge and exits from the other side of the web adjacent the other edge; means for continuously modulating the source of microwave energy so as to change the energy transmission path through the sample by at least one-half wavelength of the microwave energy; at least one microwave collimating lens mounted between said radiating element and said receiving element; and scanning means for moving said radiating and receiving elements together in synchronism relative to said web while maintaining alignment of said radiating and receiving element so as to move the area of attenuation transversely back and forth across said web.
Claim 2
Dependent Claim
248 words
Apparatus for measuring the amount of moisture in a sample in the form of a web, comprising: a source of microwave energy; a microwave energy radiating element connected to said source and positioned adjacent one edge of said web to impinge microwave energy on one side of said web; a microwave energy receiving element positioned adjacent the other edge of said web to receive microwave energy emanating from the other side of the sample and aligned with said radiating element so that they are laterally offset from each other relative to the web; a microwave energy indicator connected to said receiving element and said sample being in the form of a web with its transverse dimension lying generally in a plane which makes an acute angle with a line extending between said radiating and receiving elements such that energy enters generally from one side of the web adjacent one edge and exits from the other side of the web adjacent the other edge; means for continuously modulating the source of microwave energy so as to change the energy transmission path through the sample by at least one-half wavelength of the microwave energy; at least one microwave collimating lens mounted between said radiating element and said receiving element; and scanning means for moving said radiating and receiving elements together in synchronism relative to said web while maintaining alignment of said radiating and receiving element so as to move the area of attenuation transversely back and forth across said web.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |