CA1338881C - Coating-responsive condition monitoring system - Google Patents

Coating-responsive condition monitoring system

Info

Publication number
CA1338881C
CA1338881C CA 609418 CA609418A CA1338881C CA 1338881 C CA1338881 C CA 1338881C CA 609418 CA609418 CA 609418 CA 609418 A CA609418 A CA 609418A CA 1338881 C CA1338881 C CA 1338881C
Authority
CA
Canada
Prior art keywords
bridge
output
coupled
sensor
admittance
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.)
Expired - Fee Related
Application number
CA 609418
Other languages
English (en)
French (fr)
Inventor
L. Jonathan Kramer
Frederick L. Maltby
Steven R. Pertersen
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.)
Drexelbrook Controls Inc
Original Assignee
Drexelbrook Controls Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Drexelbrook Controls Inc filed Critical Drexelbrook Controls Inc
Application granted granted Critical
Publication of CA1338881C publication Critical patent/CA1338881C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
CA 609418 1988-08-25 1989-08-25 Coating-responsive condition monitoring system Expired - Fee Related CA1338881C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23690488A 1988-08-25 1988-08-25
US236,904 1994-04-29

Publications (1)

Publication Number Publication Date
CA1338881C true CA1338881C (en) 1997-01-28

Family

ID=22891481

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 609418 Expired - Fee Related CA1338881C (en) 1988-08-25 1989-08-25 Coating-responsive condition monitoring system

Country Status (5)

Country Link
JP (1) JP2930340B2 (fi)
CA (1) CA1338881C (fi)
DE (1) DE3990989T (fi)
GB (1) GB2247529B (fi)
WO (1) WO1990002319A1 (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351901B (en) * 1999-07-14 2001-06-27 Earth Anchors Ltd A bench
KR100434930B1 (ko) * 2001-03-07 2004-06-14 박경래 양궁용 안정기의 보강장치
DE102007049526A1 (de) * 2007-10-15 2009-04-16 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße
SE541463C2 (sv) * 2017-10-06 2019-10-08 Sealwacs Ab Plastsvetssensor

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800755A (en) * 1982-08-25 1989-01-31 Berwind Corporation Capacitance-type material level indicator
US4686857A (en) * 1983-03-04 1987-08-18 Kabushiki Kaisha Toyota Chuo Kenkyusho Method and apparatus for evaluating the performance of dielectric substances
US4624139A (en) * 1984-09-21 1986-11-25 Berwind Corporation Capacitance-type material level indicator
US4676100A (en) * 1984-10-31 1987-06-30 Berwind Corporation Capacitance-type material level indicator
US4638305A (en) * 1985-03-22 1987-01-20 General Motors Corporation Apparatus for detecting water in fuel
DE3537129C2 (de) * 1985-10-18 1996-06-13 Crostack Horst Artur Prof Dr I Verfahren und Vorrichtung zur zerstörungsfreien Werkstoffprüfung, insbesondere zur Dickenbestimmung
US4723122A (en) * 1985-10-25 1988-02-02 Drexelbrook Controls, Inc. Remotely calibratable instrument system
US4757252A (en) * 1985-10-25 1988-07-12 Drexelbrook Controls, Inc. Probe system for measuring the condition of materials
US4676101A (en) * 1986-09-03 1987-06-30 Walbro Corporation Capacitance-type material level indicator
US4749988A (en) * 1986-11-20 1988-06-07 Imtec Products, Inc. Non-invasive liquid level sensor

Also Published As

Publication number Publication date
JP2930340B2 (ja) 1999-08-03
GB2247529B (en) 1993-04-14
GB9103868D0 (en) 1991-05-15
WO1990002319A1 (en) 1990-03-08
JPH04501770A (ja) 1992-03-26
DE3990989T (fi) 1992-01-30
GB2247529A (en) 1992-03-04

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Legal Events

Date Code Title Description
MKLA Lapsed