• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method and an apparatus for detection of knots in lumber by means of microwave radiation. Radiation from a transmitter is directed toward a piece of lumber and the radiation reflected from and/or passed through the piece of lumber is detected by means of a receiver. A radiation field having a TEM wave mode is established on the surface of the piece of lumber by means of a transmitter, whereby a radiation field which includes a TM wave mode component is generated in a knot in the piece of lumber and this is detected by means of a receiver.
    公开号:SU1322992A3
    申请号:SU833652182
    申请日:1983-09-09
    公开日:1987-07-07
    发明作者:Яккула Пекка
    申请人:А.Альстрем Осакейхтие (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to microwave defectoscopy and can be used to detect knots and sows or the like in timber products, especially lumber.
    The purpose of the invention is to ensure the reliability of detecting defects in the form of knots and twigs in lumber.
    - FIG. 1 shows a structural electrical circuit of a device implementing a method for detecting defects in a dielectric material; on 4ig. 2 - the longitudinal distribution of the electric field at the knot; FIG. 3 is a view A of FIG. 1; FIG. A shows the receiver structure.
    A device for detecting defects in a dielectric material contains a microwave generator 1, a transmitting antenna 2, a TEM radiating wave, a receiving antenna 3 in the form of a circular waveguide, a detector 4 and a preamplifier 5, a conveyor 6 for feeding the dielectric material under study - knotted boards 7 eight
    A device for detecting defects in a dielectric material operates as follows.
    The microwave generator 1 generates a type H wave (), at distances x from the aperture from the transmitting antenna 2, greater than 3fig (, is the wavelength in free space), the electromagnetic wave is of the main type (TEM - transverse electromagnetic wave). Thus, microwave radiation reaching the surface of the board 7 has only one type of vibration, i.e. there is only a transverse component of the electric or magnetic field and there is no longitudinal component.
    The knot 8 in board 7 is thicker than the rest of the lumber, and
    its dielectric constant is different from the dielectric constant of the rest of the lumber. Thus, the knot 8 is an electric waveguide in which a wave of type E, (TM) is excited.
    Receiving antenna 3 has dimensions and shape under the conditions of propagation in it of a wave of type Eg, (THg,).
    The detector 4 detects a wave of type E about.
    In the absence of knots 8 mode E ,, waves to the receiving antenna 3 is not received. Detector 4 is also configured to only receive type E waves.
    Multiple receiving antennas 3 and detectors 4 may be used, which are located on the same line adjacent to each other (Fig. 4). Board 7 is moved by conveyor 6 between transmitting 2 and receiving 3 antennas. The readings from the outputs of the preamplifiers 5 are sequentially counted and transmitted to the processing unit.
    Transmitting 2 and receiving 3 antennas can be located on one side of the board 7.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    A method for detecting defects in dielectric materials, including the irradiation of a dielectric material by an electromagnetic wave in the microwave range, the reception of an electromagnetic wave interacting with a dielectric material, and its registration, characterized in that, in order to increase the reliability of detection of defects in the form of knots and swells In lumber, irradiation is performed by an electromagnetic wave with TEM-type oscillations, and an electromagnetic wave is received with an Eg-type oscillation.
    FIG. g
    Vidl
    (rig 3
    / /
    Compiled by R.Kuznetsova Editor S.Pekar Tehred M.Morgental Corrector A.T.
    Order 2884/59 Circulation 776 Subscription
    VNIIPI USSR State Committee
    for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
    Production and printing company, Uzhgorod, Projecto st., 4
    Fig
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    同族专利:
    公开号 | 公开日
    FI823151A0|1982-09-10|
    SE8304820L|1984-03-11|
    US4607212A|1986-08-19|
    FI65673B|1984-02-29|
    SE8304820D0|1983-09-08|
    FI65673C|1984-06-11|
    SE460504B|1989-10-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2004097391A1|2003-04-29|2004-11-11|Yury Mikhailovich Ermolaev|Method and device for radiographing objects and media on longitudinal electric waves|US4123702A|1976-02-13|1978-10-31|Ilmari Kinanen|Method for classifying and measuring of timbers|
    US4123703A|1977-09-02|1978-10-31|Sri International|Microwave method of and apparatus for flaw detection|
    FI57490C|1978-06-01|1980-08-11|Innotec Oy|FOERFARANDE FOER BESTAEMNING AV SNEDFIBRIGHETEN I VIRKE I SYNNERHET I SAOGAT VIRKE|
    DD139028A1|1978-10-26|1979-12-05|Ludwig Weisser|STRIP HEADER FOR MEASURING THE MOISTURE OF STRETCH FIBER STRENGTH BY MEANS OF MICROWAVES|
    DE3107675C2|1981-02-28|1985-06-20|Elektro-Physik Hans Nix & Dr.-Ing. E. Steingroever KG, 5000 Köln|Method and device for the electronic measurement of the thickness of very thin electrically conductive layers on a non-conductive substrate|US4831545A|1987-06-26|1989-05-16|Weyerhaeuser Company|Method for determination of pith location relative to lumber surfaces|
    US4916629A|1987-06-26|1990-04-10|Weyerhaeuser Company|Method for determination of pith location relative to lumber surfaces|
    US4926350A|1987-09-14|1990-05-15|Metriguard, Inc.|Non-destructive testing methods for lumber|
    FR2635187B1|1988-08-03|1990-11-09|Centre Nat Rech Scient|DEVICE FOR TRANSMITTING AND RECEIVING MICROWAVE RADIATION, FOR IMAGING BURIED OBJECTS|
    JP3262606B2|1992-03-27|2002-03-04|旭硝子株式会社|Internal quality evaluation method for molten cast refractories|
    US5393557A|1992-12-17|1995-02-28|Northrop Grumman Corporation|Method for measuring electromagnetic properties|
    US5960104A|1996-08-16|1999-09-28|Virginia Polytechnic & State University|Defect detection system for lumber|
    US6756789B1|1999-05-27|2004-06-29|New Zealand Forest Research Institute Limited|Method for imaging logs or stems and apparatus|
    US6480141B1|2001-03-13|2002-11-12|Sandia Corporation|Detection of contraband using microwave radiation|
    US8400166B2|2009-04-29|2013-03-19|The Boeing Company|Non-destructive determination of electromagnetic properties|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI823151A|FI65673C|1982-09-10|1982-09-10|FOERFARANDE OCH ANORDNING FOER DETEKTERING AV KVISTAR ELLER DYIKT I SAOGAT VIRKE|
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