GB1489554A - Method for classifying timber - Google Patents

Method for classifying timber

Info

Publication number
GB1489554A
GB1489554A GB491076A GB491076A GB1489554A GB 1489554 A GB1489554 A GB 1489554A GB 491076 A GB491076 A GB 491076A GB 491076 A GB491076 A GB 491076A GB 1489554 A GB1489554 A GB 1489554A
Authority
GB
United Kingdom
Prior art keywords
timber
feb
micro
antenna
frequency
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
Application number
GB491076A
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.)
INSINOORITOIMISTO INNOTEC Oy
Original Assignee
INSINOORITOIMISTO INNOTEC Oy
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
Priority claimed from FI750407A external-priority patent/FI52405C/en
Priority claimed from FI753249A external-priority patent/FI53504C/en
Application filed by INSINOORITOIMISTO INNOTEC Oy filed Critical INSINOORITOIMISTO INNOTEC Oy
Publication of GB1489554A publication Critical patent/GB1489554A/en
Expired 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
    • 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
    • G01N22/02—Investigating the presence of flaws
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Length-Measuring Devices Using Wave Or Particle Radiation (AREA)

Abstract

1489554 Classifying timber using radio waves INSINOORITOIMISTO INNOTEC OY 9 Feb 1976 [14 Feb 1975 19 Nov 1975] 04910/76 Heading G1N Timber is classified by detecting knots in it by determining the phase shift of a micro-wave signal passed through it. Energy from an r.f. generator 2 preferably having a frequency of 10 GHz is passed via waveguide 3 to a transmitting antenna 4, having an aperture which is short in the direction of travel of the timber but is equal laterally to the width of the timber. A receiving antenna 5 connects to a diode detector 6. There may be pairs of antennae operating at different frequencies whereby the effects of moisture or of movements of the timber towards either antenna may be compensated. The micro-wave signal may be frequency or amplitude modulated. The intensity or type of polarization of the radiation can be selected taking into consideration the direction in which timber is to be measured or growth direction. The signal received when gaps between timber lengths are present between the antennae may be used for calibration.
GB491076A 1975-02-14 1976-02-09 Method for classifying timber Expired GB1489554A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI750407A FI52405C (en) 1975-02-14 1975-02-14 Procedure for classification and measurement of timber.
FI753249A FI53504C (en) 1975-11-19 1975-11-19 FOERFARANDE FOER VIRKESKLASSNING OCH -MAETNING MEDELST REFLEXIONSFOERFARANDE

Publications (1)

Publication Number Publication Date
GB1489554A true GB1489554A (en) 1977-10-19

Family

ID=26156714

Family Applications (1)

Application Number Title Priority Date Filing Date
GB491076A Expired GB1489554A (en) 1975-02-14 1976-02-09 Method for classifying timber

Country Status (4)

Country Link
JP (1) JPS51107163A (en)
DE (1) DE2605448A1 (en)
GB (1) GB1489554A (en)
SE (1) SE407982B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206213A (en) * 1987-06-23 1988-12-29 De Beers Ind Diamond Sorting ore particles
US5585732A (en) * 1995-06-07 1996-12-17 Mississippi State University Detector for heterogeneous materials
US5619143A (en) * 1989-02-14 1997-04-08 Commonwealth Scientific And Industrial Research Organisation Microwave scanning apparatus
US6756789B1 (en) 1999-05-27 2004-06-29 New Zealand Forest Research Institute Limited Method for imaging logs or stems and apparatus
US6784672B2 (en) 2001-06-15 2004-08-31 Mississippi State University Through-log density detector
EP2295963A1 (en) * 2009-09-11 2011-03-16 MICROTEC S.r.l. Method and apparatus for determining the knot-to-volume ratio of wooden planks

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2712600C2 (en) * 1976-03-22 1986-06-19 Insinööritoimisto Innotec Oy, Espoo Device for detecting a sudden change in the high frequency energy transmitted or reflected by wood
NL175344C (en) * 1976-12-17 1984-10-16 Jahn H H O METHOD FOR EXAMINING A WALL CONSTRUCTION
FI57490C (en) * 1978-06-01 1980-08-11 Innotec Oy FOERFARANDE FOER BESTAEMNING AV SNEDFIBRIGHETEN I VIRKE I SYNNERHET I SAOGAT VIRKE
JPS59195145A (en) * 1983-04-20 1984-11-06 Nippon Denso Co Ltd Sensor for alcohol content
JPS59187247A (en) * 1983-04-06 1984-10-24 Nippon Denso Co Ltd Sensor of content of alcohol
JPS6176942A (en) * 1984-09-22 1986-04-19 Kanzaki Paper Mfg Co Ltd Orientation measuring method of dielectric sheet
DE102011110011B4 (en) * 2011-08-11 2014-05-22 Fagus-Grecon Greten Gmbh & Co. Kg Device for checking a wood material, in particular a wood-based panel in a continuous strand during its manufacture
RU2577886C2 (en) * 2014-05-05 2016-03-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Поволжский государственный технологический университет" Device for proximate diagnostics of standing wood resonance properties

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206213A (en) * 1987-06-23 1988-12-29 De Beers Ind Diamond Sorting ore particles
US4933075A (en) * 1987-06-23 1990-06-12 Lee Nordin Sorting method and apparatus using microwave phase-shift detection
AU603456B2 (en) * 1987-06-23 1990-11-15 De Beers Industrial Diamond Division (Proprietary) Limited Sorting method and apparatus
GB2206213B (en) * 1987-06-23 1991-04-17 De Beers Ind Diamond Sorting method and apparatus
US5619143A (en) * 1989-02-14 1997-04-08 Commonwealth Scientific And Industrial Research Organisation Microwave scanning apparatus
US5585732A (en) * 1995-06-07 1996-12-17 Mississippi State University Detector for heterogeneous materials
US6756789B1 (en) 1999-05-27 2004-06-29 New Zealand Forest Research Institute Limited Method for imaging logs or stems and apparatus
US6784672B2 (en) 2001-06-15 2004-08-31 Mississippi State University Through-log density detector
EP2295963A1 (en) * 2009-09-11 2011-03-16 MICROTEC S.r.l. Method and apparatus for determining the knot-to-volume ratio of wooden planks
US8408081B2 (en) 2009-09-11 2013-04-02 Microtec S.R.L. Method and apparatus for determining the nodosity of a wooden plank

Also Published As

Publication number Publication date
SE7601243L (en) 1976-08-15
JPS51107163A (en) 1976-09-22
SE407982B (en) 1979-04-30
DE2605448A1 (en) 1976-08-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee