SE9000065L - METHOD AND APPARATUS FOR DETERMINING THE MOISTURE CONTENT IN A MATERIAL - Google Patents

METHOD AND APPARATUS FOR DETERMINING THE MOISTURE CONTENT IN A MATERIAL

Info

Publication number
SE9000065L
SE9000065L SE9000065A SE9000065A SE9000065L SE 9000065 L SE9000065 L SE 9000065L SE 9000065 A SE9000065 A SE 9000065A SE 9000065 A SE9000065 A SE 9000065A SE 9000065 L SE9000065 L SE 9000065L
Authority
SE
Sweden
Prior art keywords
signal
measured
water content
component
delta
Prior art date
Application number
SE9000065A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE505241C2 (en
SE9000065D0 (en
Inventor
P Jakkula
Original Assignee
Kajaani Electronics
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 Kajaani Electronics filed Critical Kajaani Electronics
Publication of SE9000065D0 publication Critical patent/SE9000065D0/en
Publication of SE9000065L publication Critical patent/SE9000065L/en
Publication of SE505241C2 publication Critical patent/SE505241C2/en

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

Abstract

PURPOSE: To at a high speed and continuously measure water content of a material by a method in which a microwave signal is fed into the material and the speed change of the signal passed is measured, based on the known interdependent relationship between the speed change of the signal and the water content of the material. CONSTITUTION: A directionality coupler 6 divides a microwaver signal into a first component I and a second component II, and the component I is fed to a transmitter 7 and the signal is fed into a material to be measured. A receiver 8 receives a microwave signal I passed through the material to be measured. The transmitter 7 and receiver 8 are disposed counter to each other across the material. On the way of passing the material, the signal I is decelerated more than the signal component II used as the reference amount in a mixer 9, and delayed in a time manner. The mixer 9 mixes the signals I, II to generate an intermediate frequency signal Δf, which is fetched out from an output gate IF to measure frequency of the signal Δf in a counter 3. Water content of the material to be measured can be acquired from this frequency based on the known interdependent relationship between the signal Δf and the water content.
SE9000065A 1989-01-13 1990-01-09 Method and apparatus for determining the moisture content of a material SE505241C2 (en)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE9000065D0 SE9000065D0 (en) 1990-01-09
SE9000065L true SE9000065L (en) 1990-07-14
SE505241C2 SE505241C2 (en) 1997-07-21

Family

ID=8527725

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9000065A SE505241C2 (en) 1989-01-13 1990-01-09 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)

Families Citing this family (12)

* 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
CA2914187C (en) 2013-06-28 2023-09-12 Sensors & Software Inc. System and method for measurement of material property using variable reflector
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

Also Published As

Publication number Publication date
JP3026223B2 (en) 2000-03-27
CA2007300A1 (en) 1990-07-13
SE505241C2 (en) 1997-07-21
SE9000065D0 (en) 1990-01-09
FI84402C (en) 1991-11-25
DE4000925C2 (en) 1998-01-22
CA2007300C (en) 2000-09-26
DE4000925A1 (en) 1990-07-19
JPH02238348A (en) 1990-09-20
FI890201A0 (en) 1989-01-13
FI84402B (en) 1991-08-15
FI890201A (en) 1990-07-14

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