CA2557951A1 - Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems - Google Patents

Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems Download PDF

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Publication number
CA2557951A1
CA2557951A1 CA002557951A CA2557951A CA2557951A1 CA 2557951 A1 CA2557951 A1 CA 2557951A1 CA 002557951 A CA002557951 A CA 002557951A CA 2557951 A CA2557951 A CA 2557951A CA 2557951 A1 CA2557951 A1 CA 2557951A1
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CA
Canada
Prior art keywords
sensor portion
changes
sensor
methods
water content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002557951A
Other languages
French (fr)
Other versions
CA2557951C (en
Inventor
Lee Chase
John Goss
Graham V. Walford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Measurex Corp
Original Assignee
Lee Chase
John Goss
Graham V. Walford
Honeywell-Measurex Corporation
Measurex Corporation
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Filing date
Publication date
Priority claimed from US08/766,864 external-priority patent/US5891306A/en
Application filed by Lee Chase, John Goss, Graham V. Walford, Honeywell-Measurex Corporation, Measurex Corporation filed Critical Lee Chase
Publication of CA2557951A1 publication Critical patent/CA2557951A1/en
Application granted granted Critical
Publication of CA2557951C publication Critical patent/CA2557951C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

An apparatus for sensing three properties of materials: the conductivity or resistance, the dielectric constant, and the proximity of the material to the sensor portion of the apparatus. The apparatus includes a fixed impedance element coupled in series with the sensor portion of the apparatus between an input signal and ground. The sensor portion of the apparatus is an electrode configuration which includes at least two electrodes with a portion of the material residing between and in close proximity to the electrodes. The sensor exhibits a variable impedance resulting from changes in physical characteristics of the material. The fixed impedance element and the variable impedance of the sensor portion form a voltage divider network such that changes in impedance of the sensor portion results in changes in voltage on the output of the apparatus. The variable impedance of the sensor portion relates to changes in property of the material being sensed which can then be related to changes in other physical characteristics of the material such as weight, chemical composition, and temperature.
CA002557951A 1996-12-13 1997-12-12 Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems Expired - Fee Related CA2557951C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/766,864 1996-12-13
US08/766,864 US5891306A (en) 1996-12-13 1996-12-13 Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems
CA002277837A CA2277837C (en) 1996-12-13 1997-12-12 Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002277837A Division CA2277837C (en) 1996-12-13 1997-12-12 Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems

Publications (2)

Publication Number Publication Date
CA2557951A1 true CA2557951A1 (en) 1998-06-18
CA2557951C CA2557951C (en) 2007-11-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA002557951A Expired - Fee Related CA2557951C (en) 1996-12-13 1997-12-12 Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems

Country Status (1)

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CA (1) CA2557951C (en)

Also Published As

Publication number Publication date
CA2557951C (en) 2007-11-27

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Effective date: 20171212