CA2424214A1 - Microwave moisture sensing via waveguide with slot array - Google Patents

Microwave moisture sensing via waveguide with slot array Download PDF

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Publication number
CA2424214A1
CA2424214A1 CA002424214A CA2424214A CA2424214A1 CA 2424214 A1 CA2424214 A1 CA 2424214A1 CA 002424214 A CA002424214 A CA 002424214A CA 2424214 A CA2424214 A CA 2424214A CA 2424214 A1 CA2424214 A1 CA 2424214A1
Authority
CA
Canada
Prior art keywords
waveguide
slot array
moisture sensing
sensing via
via waveguide
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
CA002424214A
Other languages
French (fr)
Other versions
CA2424214C (en
Inventor
Wayne Stephen Holmes
Stephen Geoffrey Riley
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.)
New Zealand Forest Research Institute Ltd
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 CA2424214A1 publication Critical patent/CA2424214A1/en
Application granted granted Critical
Publication of CA2424214C publication Critical patent/CA2424214C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/46—Wood

Abstract

A generator (6) directs microwave signals to a waveguide (1) having a linear array of slots (2), and the signals are received by measuring means (5). The local permittivity or moisture content of material adjacent the waveguide (1), such as a stack of timber, may be determined at each slot (2) via regression analysis. The total permittivity or moisture may be determined by averaging measurements obtained for both transmission directions of the waveguide (1).
The apparatus may be used for controlling drying parameters, such as drying time, for the material.
CA002424214A 2000-10-11 2001-10-11 Microwave moisture sensing via waveguide with slot array Expired - Fee Related CA2424214C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NZ50746900 2000-10-11
NZ507469 2000-10-11
PCT/NZ2001/000225 WO2002031479A1 (en) 2000-10-11 2001-10-11 Microwave moisture sensing via waveguide with slot array

Publications (2)

Publication Number Publication Date
CA2424214A1 true CA2424214A1 (en) 2002-04-18
CA2424214C CA2424214C (en) 2009-10-06

Family

ID=19928174

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002424214A Expired - Fee Related CA2424214C (en) 2000-10-11 2001-10-11 Microwave moisture sensing via waveguide with slot array

Country Status (4)

Country Link
US (1) US6903557B2 (en)
AU (2) AU2002212851C1 (en)
CA (1) CA2424214C (en)
WO (1) WO2002031479A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6930492B2 (en) * 2002-08-29 2005-08-16 Malcam Ltd. Using surface microwaves for measuring and determining density and/or moisture content of a material
US8299408B2 (en) * 2005-09-22 2012-10-30 Eastman Chemical Company Microwave reactor having a slotted array waveguide coupled to a waveguide bend
US8487223B2 (en) * 2005-09-22 2013-07-16 Eastman Chemical Company Microwave reactor having a slotted array waveguide
US7676953B2 (en) 2006-12-29 2010-03-16 Signature Control Systems, Inc. Calibration and metering methods for wood kiln moisture measurement
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process
CN110806417B (en) * 2019-10-30 2022-04-22 杭州电子科技大学 Kapton500 HN-based EMSIW humidity sensor
DE102020103191A1 (en) 2020-02-07 2021-08-12 Imko Micromodultechnik Gmbh Pulse transit time-based measuring device for conductivity measurement
CN113639525A (en) * 2021-08-03 2021-11-12 鄂尔多斯市琢成生物科技有限责任公司 Continuous thin-layer spirulina microwave drying process and device
CN114354654B (en) * 2022-01-07 2023-03-21 中国矿业大学 DW-KNN-based rapid nondestructive testing method for coal moisture content
WO2023218766A1 (en) * 2022-05-13 2023-11-16 ソニーグループ株式会社 Sensor device, information processing device, information processing method, and program
CN114741674B (en) * 2022-06-15 2022-09-09 深圳市智能派科技有限公司 Internet-based 3D printing equipment management method and system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1285362A1 (en) * 1981-06-23 1987-01-23 Запорожский машиностроительный институт им.В.Я.Чубаря Aerial for measuring moisture content of soil grounds and loose materials
US5103181A (en) * 1988-10-05 1992-04-07 Den Norske Oljeselskap A. S. Composition monitor and monitoring process using impedance measurements
US5619143A (en) 1989-02-14 1997-04-08 Commonwealth Scientific And Industrial Research Organisation Microwave scanning apparatus
WO1990009578A1 (en) * 1989-02-14 1990-08-23 Commonwealth Scientific And Industrial Research Organisation Microwave scanning apparatus
CA2238957C (en) * 1995-11-29 2005-06-21 Industrial Research Limited Method and apparatus for moisture sensing using microwave technologies
US6411106B1 (en) 1995-11-29 2002-06-25 Industrial Research Limited Method and apparatus for moisture sensing using microwave technologies

Also Published As

Publication number Publication date
CA2424214C (en) 2009-10-06
AU2002212851C1 (en) 2006-11-02
AU1285102A (en) 2002-04-22
US6903557B2 (en) 2005-06-07
AU2002212851B2 (en) 2006-03-09
US20040124855A1 (en) 2004-07-01
WO2002031479A1 (en) 2002-04-18

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20131011