CA2007300A1 - Method and apparatus for determining the moisture content of a material - Google Patents

Method and apparatus for determining the moisture content of a material

Info

Publication number
CA2007300A1
CA2007300A1 CA 2007300 CA2007300A CA2007300A1 CA 2007300 A1 CA2007300 A1 CA 2007300A1 CA 2007300 CA2007300 CA 2007300 CA 2007300 A CA2007300 A CA 2007300A CA 2007300 A1 CA2007300 A1 CA 2007300A1
Authority
CA
Canada
Prior art keywords
moisture content
change
velocity
measured
microwave signal
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
CA 2007300
Other languages
French (fr)
Other versions
CA2007300C (en
Inventor
Pekka Jakkula
Esko Tahkola
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.)
Valmet Automation Oy
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2007300A1 publication Critical patent/CA2007300A1/en
Application granted granted Critical
Publication of CA2007300C publication Critical patent/CA2007300C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
    • G01N22/04—Investigating moisture content

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

In the method of the invention, a microwave signal is passed through a material whose moisture content is to be measured, the change in the velocity of the signal which has travelled through the material is measured and the moisture content is determined on the basis of the measured change and a known interdependence between the changes in the microwave signal velocity and the moisture content of the material. The apparatus comprises a transmitting device (1) which transmits a microwave signal through the material to be measured, and a detecting device {2) and a counting device (3) which measure the change of velocity of the signal transmitted through the material and determine the moisture content of the material on the basis of a known interdependence of the change of velocity of the microwave signal in question and change of moisture content of the material.
CA 2007300 1989-01-13 1990-01-08 Method and apparatus for determining the moisture content of a material Expired - Lifetime CA2007300C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI890201 1989-01-13
FI890201A FI84402C (en) 1989-01-13 1989-01-13 Method and apparatus for determining moisture content of the material

Publications (2)

Publication Number Publication Date
CA2007300A1 true CA2007300A1 (en) 1990-07-13
CA2007300C CA2007300C (en) 2000-09-26

Family

ID=8527725

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2007300 Expired - Lifetime CA2007300C (en) 1989-01-13 1990-01-08 Method and apparatus for determining the moisture content of a material

Country Status (5)

Country Link
JP (1) JP3026223B2 (en)
CA (1) CA2007300C (en)
DE (1) DE4000925C2 (en)
FI (1) FI84402C (en)
SE (1) SE505241C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3014254A4 (en) * 2013-06-28 2017-05-17 Sensors & Software Inc. System and method for measurement of material property using variable reflector

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3160474B2 (en) * 1994-09-12 2001-04-25 株式会社東芝 Microwave densitometer
DE19725305A1 (en) * 1997-06-14 1998-12-17 Micas Elektronik Gmbh U Co Kg Method of determining the moisture content in an object
FI104447B (en) * 1998-07-10 2000-01-31 Valmet Automation Inc Method and instrument for measuring the gas content of a liquid substance
JP2000111499A (en) 1998-10-02 2000-04-21 Toshiba Fa Syst Eng Corp Microwave concentration-measuring device
US6854322B2 (en) * 2002-06-10 2005-02-15 The Procter & Gamble Company Directional coupler sensor
US7151380B2 (en) 2004-08-06 2006-12-19 Voith Paper Patent Gmbh Microwave water weight sensor and process
DE102004058641B4 (en) * 2004-12-01 2007-03-01 Agueeva, Olga, Dr. Method for the continuous or discontinuous determination of the concentration of the constituents contained in a medium by means of evaluation of the microwaves permeating the medium
DE102006052789B3 (en) * 2006-11-09 2008-07-10 Festo Ag & Co Method and position measuring device for determining a position of a measuring object
DE102014216466A1 (en) * 2014-08-20 2016-02-25 Bayerische Motoren Werke Aktiengesellschaft Quantitative determination of the water content of materials
CN104977312B (en) * 2015-06-18 2017-10-13 四川莱源科技有限公司 The method of testing of radar type microwave water measurer device
DE102017202214B4 (en) 2017-02-13 2019-06-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method and arrangement for measuring properties of a material web

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851244A (en) * 1973-12-18 1974-11-26 Electronic Ass Of Canada Ltd Microwave moisture measuring apparatus
NL8100250A (en) * 1980-03-13 1981-10-01 Halliburton Co ACOUSTIC LOG SYSTEM WITH SWING ENERGY SOURCE.
DE3150202A1 (en) * 1981-12-18 1983-06-23 Philips Patentverwaltung Gmbh, 2000 Hamburg ARRANGEMENT FOR MEASURING THE HUMIDITY
JPH0785062B2 (en) * 1987-06-09 1995-09-13 建設省土木研究所長 Method for measuring soil dry density by electromagnetic waves

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3014254A4 (en) * 2013-06-28 2017-05-17 Sensors & Software Inc. System and method for measurement of material property using variable reflector
US10247680B2 (en) 2013-06-28 2019-04-02 Sensors & Software Inc. System and method for measurement of material property using variable reflector
US10527560B2 (en) 2013-06-28 2020-01-07 Sensors & Software Inc. System and method for measurement of material property using variable reflector

Also Published As

Publication number Publication date
FI890201A0 (en) 1989-01-13
SE9000065D0 (en) 1990-01-09
CA2007300C (en) 2000-09-26
DE4000925A1 (en) 1990-07-19
JPH02238348A (en) 1990-09-20
FI890201A (en) 1990-07-14
DE4000925C2 (en) 1998-01-22
JP3026223B2 (en) 2000-03-27
FI84402C (en) 1991-11-25
FI84402B (en) 1991-08-15
SE505241C2 (en) 1997-07-21
SE9000065L (en) 1990-07-14

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Legal Events

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