NO20030183L - Fremgangsmate og system for a bestemme porositeten i komposittmaterialer ved hjelp av ultralyd - Google Patents

Fremgangsmate og system for a bestemme porositeten i komposittmaterialer ved hjelp av ultralyd

Info

Publication number
NO20030183L
NO20030183L NO20030183A NO20030183A NO20030183L NO 20030183 L NO20030183 L NO 20030183L NO 20030183 A NO20030183 A NO 20030183A NO 20030183 A NO20030183 A NO 20030183A NO 20030183 L NO20030183 L NO 20030183L
Authority
NO
Norway
Prior art keywords
ultrasound
porosity
determining
composite materials
composite
Prior art date
Application number
NO20030183A
Other languages
English (en)
Other versions
NO20030183D0 (no
Inventor
March Dubois
Jr John B Deaton
Peter W Lorraine
Jr Thomas E Drake
Robert J Filkins
Original Assignee
Lockheed Corp
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
Publication of NO20030183L publication Critical patent/NO20030183L/no
Application filed by Lockheed Corp filed Critical Lockheed Corp
Publication of NO20030183D0 publication Critical patent/NO20030183D0/no

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22Details, e.g. general constructional or apparatus details
    • G01N29/30Arrangements for calibrating or comparing, e.g. with standard objects
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04Analysing solids
    • G01N29/11Analysing solids by measuring attenuation of acoustic waves
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22Details, e.g. general constructional or apparatus details
    • G01N29/24Probes
    • G01N29/2418Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/449Statistical methods not provided for in G01N29/4409, e.g. averaging, smoothing and interpolation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/01Indexing codes associated with the measuring variable
    • G01N2291/014Resonance or resonant frequency
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/023Solids
    • G01N2291/0231Composite or layered materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/024Mixtures
    • G01N2291/0245Gases in porous solids
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/028Material parameters
    • G01N2291/0289Internal structure, e.g. defects, grain size, texture
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/04Wave modes and trajectories
    • G01N2291/042Wave modes
    • G01N2291/0421Longitudinal waves
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/04Wave modes and trajectories
    • G01N2291/044Internal reflections (echoes), e.g. on walls or defects

Landscapes

  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Acoustics & Sound (AREA)
  • Probability & Statistics with Applications (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
NO20030183A 2000-07-14 2003-01-14 System og fremgangsmåte for bestemmelse av porösitetkomposittmaterialer vedhjelp av ultralyd NO20030183D0 (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21834100P 2000-07-14 2000-07-14
PCT/US2001/022156 WO2002006814A2 (en) 2000-07-14 2001-07-13 A system and method of determining porosity in composite materials using ultrasound

Publications (2)

Publication Number Publication Date
NO20030183L true NO20030183L (no) 2002-01-24
NO20030183D0 NO20030183D0 (no) 2003-01-14

Family

ID=22814717

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20030183A NO20030183D0 (no) 2000-07-14 2003-01-14 System og fremgangsmåte for bestemmelse av porösitetkomposittmaterialer vedhjelp av ultralyd

Country Status (9)

Country Link
US (1) US6684701B2 (no)
EP (1) EP1301778B1 (no)
JP (1) JP4789394B2 (no)
KR (1) KR20030015389A (no)
AU (1) AU2002222955A1 (no)
CA (1) CA2411628C (no)
IL (1) IL153807A0 (no)
NO (1) NO20030183D0 (no)
WO (1) WO2002006814A2 (no)

Families Citing this family (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPR450801A0 (en) * 2001-04-20 2001-05-24 Commonwealth Scientific And Industrial Research Organisation Method and apparatus for carrying out non-destructive testing of materials
US6668654B2 (en) * 2001-08-15 2003-12-30 Lockheed Martin Corporation Method and apparatus for generating specific frequency response for ultrasound testing
RU2231054C1 (ru) * 2002-12-03 2004-06-20 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" Способ определения степени полимеризации композиционных материалов
RU2231056C1 (ru) * 2003-03-07 2004-06-20 Государственное образовательное учреждение высшего профессионального образования Санкт-Петербургский государственный электротехнический университет" Способ контроля среднего размера зерна материала с помощью ультразвука
DE10329142A1 (de) * 2003-06-27 2005-01-27 Intelligendt Systems & Services Gmbh & Co. Kg Verfahren zum Ermitteln der Porosität eines Werkstückes
DE10343517A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Verfahren und Anordnung zur Bestimmung der Wasserdurchlässigkeit einer Bespannung
US7369250B2 (en) * 2005-03-25 2008-05-06 Lockheed Martin Corporation System and method to inspect components having non-parallel surfaces
KR101101422B1 (ko) * 2005-05-23 2012-01-02 엘지전자 주식회사 공기 조화기
US20070015992A1 (en) * 2005-06-30 2007-01-18 General Electric Company System and method for optoacoustic imaging
US7353709B2 (en) * 2005-07-06 2008-04-08 National Research Council Of Canada Method and system for determining material properties using ultrasonic attenuation
JP2008545123A (ja) * 2005-07-06 2008-12-11 ナショナル・リサーチ・カウンシル・オブ・カナダ 超音波減衰量を使用して材料特性を決定する方法及びシステム
US8287681B2 (en) * 2005-08-04 2012-10-16 Israel Aerospace Industries Ltd. Method for making composite articles with artificial defects
US7424818B2 (en) * 2005-10-20 2008-09-16 Boeing Company Ultrasonic inspection reference standard for porous composite materials
US7434468B2 (en) * 2005-10-31 2008-10-14 The Boeing Company Porosity reference standard for ultrasonic inspection of composite materials
US7752882B2 (en) * 2005-11-17 2010-07-13 The Boeing Company Porosity reference standard utilizing a mesh
US7694546B2 (en) * 2005-11-17 2010-04-13 The Boeing Company Porosity reference standard utilizing one or more hollow, non-cylindrical shafts
US7762120B2 (en) * 2005-12-01 2010-07-27 The Boeing Company Tapered ultrasonic reference standard
US7389693B2 (en) * 2006-02-15 2008-06-24 General Electric Company Methods and apparatus for porosity measurement
US7770457B2 (en) * 2006-10-13 2010-08-10 The Boeing Company Pseudo porosity reference standard for metallic interleaved composite laminates
US7795745B2 (en) * 2006-11-22 2010-09-14 Girtz Industries Fuel tank for a power generator set
US7617714B2 (en) * 2006-12-06 2009-11-17 The Boeing Company Pseudo porosity reference standard for cored composite laminates
US7605924B2 (en) * 2006-12-06 2009-10-20 Lockheed Martin Corporation Laser-ultrasound inspection using infrared thermography
US7617715B2 (en) * 2006-12-21 2009-11-17 The Boeing Company Reference standard for ultrasonic measurement of porosity and related method
US7784348B2 (en) * 2006-12-22 2010-08-31 Lockheed Martin Corporation Articulated robot for laser ultrasonic inspection
US7916307B2 (en) * 2006-12-22 2011-03-29 Lockheed Martin Corporation Pre-amplifier for detection lasers within laser ultrasonic inspection systems
US8029644B2 (en) * 2007-11-15 2011-10-04 The Beoing Company Controlled temperature scrap removal for tape process
US8113056B2 (en) * 2008-05-15 2012-02-14 Lockheed Martin Corporation Mid-IR laser for generation of ultrasound using a CO2 laser and harmonic generation
US7821646B2 (en) * 2008-05-15 2010-10-26 Lockheed Martin Corporation Method and apparatus for generating mid-IR laser beam for ultrasound inspection
US8054470B2 (en) * 2008-05-15 2011-11-08 Lockheed Martin Corporation Method and apparatus for spectroscopic characterization of samples using a laser-ultrasound system
US8243280B2 (en) * 2008-05-20 2012-08-14 Iphoton Solutions, Llc Laser ultrasonic measurement system with movable beam delivery
US7986412B2 (en) * 2008-06-03 2011-07-26 Jzw Llc Interferometric defect detection and classification
US7864334B2 (en) * 2008-06-03 2011-01-04 Jzw Llc Interferometric defect detection
WO2010077240A1 (en) * 2008-12-30 2010-07-08 Sikorsky Aircraft Corporation Non-destructive inspection method with objective evaluation
US8559014B2 (en) * 2009-09-25 2013-10-15 Hwan J. Jeong High-resolution, common-path interferometric imaging systems and methods
US8705028B2 (en) 2010-08-06 2014-04-22 Par Systems, Inc. Containerized systems
US20110012627A1 (en) * 2010-08-23 2011-01-20 Dispersion Technology Inc Method for determining porosity with high frequency conductivity measurement
CA2810630C (en) * 2010-10-15 2016-06-28 Toshiba Mitsubishi-Electric Industrial Systems Corporation Measuring apparatus and measuring method for metallic microstructures or material properties
US8826740B2 (en) 2011-08-02 2014-09-09 General Electric Company Methods and apparatus for porosity measurement and defect detection
US8894787B2 (en) 2012-08-23 2014-11-25 Textron Innovations, Inc. Composite panel with fixed void content and methods of making same
RU2515118C2 (ru) * 2012-08-23 2014-05-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Казанский государственный энергетический университет" (ФГБОУ ВПО "КГЭУ") Способ измерения пористости хлебобулочного изделия и устройство для осуществления
US9304112B2 (en) * 2013-04-05 2016-04-05 George Wyatt Rhodes Method for detecting the purity of gold bullion
US9804130B2 (en) * 2015-05-08 2017-10-31 The Boeing Company System and method for providing simulated ultrasound porosity waveforms
JP6841609B2 (ja) 2015-07-10 2021-03-10 3スキャン インコーポレイテッド 組織学的染色の空間的多重化
CN106323834A (zh) * 2016-08-03 2017-01-11 中国商用飞机有限责任公司 碳纤维复合材料孔隙率对比试块的标定方法
US10801836B2 (en) 2017-06-13 2020-10-13 The Boeing Company Composite parts that facilitate ultrasonic imaging of layer boundaries
US11474083B2 (en) 2020-01-03 2022-10-18 The Boeing Company Metrology qualification of non-destructive inspection systems
CN111337572A (zh) * 2020-03-20 2020-06-26 宁波江丰电子材料股份有限公司 一种钼靶坯的水浸式超声波探伤方法
KR102813892B1 (ko) * 2021-11-05 2025-05-28 한국전자기술연구원 셀의 기공 구조 분석 장치, 시스템 및 방법
JPWO2024024309A1 (no) * 2022-07-28 2024-02-01
CN115823438B (zh) * 2022-11-27 2026-04-03 哈尔滨哈飞航空工业有限责任公司 一种超声波喷水检测系统探头校准装置及偏差测量方法
CN119413681B (zh) * 2024-11-04 2025-06-03 长安大学 一种超声波作用于多孔介质的增渗效果评测方法

Family Cites Families (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006625A (en) 1975-07-30 1977-02-08 Battelle Memorial Institute Amplitude sorting of oscillatory burst signals by sampling
US4089225A (en) 1976-03-16 1978-05-16 Gard, Inc. System for residual tire life prediction by ultrasound
US4283953A (en) 1978-10-30 1981-08-18 Schlumberger Technology Corporation Method and apparatus for determining a granularity property of a subsurface formation around a borehole
US4426155A (en) 1981-10-08 1984-01-17 Monchalin Jean Pierre Method and apparatus for the interferometric wavelength measurement of frequency tunable C.W. lasers
EP0092191A3 (en) 1982-04-19 1984-05-23 General Electric Company Method and means for determining ultrasonic wave attenuation in tissue
US4575799A (en) 1983-03-23 1986-03-11 Fujitsu Limited Ultrasonic living body tissue characterization system
US4607341A (en) 1984-03-05 1986-08-19 Canadian Patents And Development Limited Device for determining properties of materials from a measurement of ultrasonic absorption
CA1224935A (en) 1984-11-28 1987-08-04 Her Majesty The Queen, In Right Of Canada, As Represented By The Ministe R Of The National Research Council And The Minister Of Energy, Mines And Resources Optical interferometric reception of ultrasonic energy
US4633715A (en) 1985-05-08 1987-01-06 Canadian Patents And Development Limited - Societe Canadienne Des Brevets Et D'exploitation Limitee Laser heterodyne interferometric method and system for measuring ultrasonic displacements
CA1268212A (en) 1986-12-29 1990-04-24 Martin Lord Method and apparatus for measuring magnetic losses in ferromagnetic materials
FR2615288B1 (fr) 1987-05-12 1989-09-22 Commissariat Energie Atomique Procede automatique d'identification de defauts par ultrasons et systeme correspondant
US4854173A (en) 1988-03-02 1989-08-08 The United States Of America As Represented By The United States Department Of Energy Measurement of intergranular attack in stainless steel using ultrasonic energy
CA1287388C (en) 1988-04-29 1991-08-06 Jean-Pierre Monchalin Broadband optical detection of transient motion from a scattering surface
JPH01308544A (ja) 1988-06-06 1989-12-13 Sumitomo Electric Ind Ltd 体腔内レーザ手術装置
US4941474A (en) 1988-07-01 1990-07-17 Massachusetts Institute Of Technology Multivariable analysis of bone condition
JPH0827264B2 (ja) 1988-09-21 1996-03-21 工業技術院長 マルチ変調周波数による光音響撮像方法
US5121629A (en) 1989-11-13 1992-06-16 E. I. Du Pont De Nemours And Company Method and apparatus for determining particle size distribution and concentration in a suspension using ultrasonics
CA2007190C (en) 1990-01-04 1998-11-24 National Research Council Of Canada Laser optical ultrasound detection
CA2013406C (en) 1990-03-29 1998-06-16 Rene Heon Optical detection of a surface motion of an object
US5092176A (en) 1990-06-29 1992-03-03 The Babcock & Wilcox Company Method for determining deposit buildup
US5062296A (en) 1990-09-20 1991-11-05 The United States Of America As Represented By The Department Of Energy Resonant ultrasound spectroscopy
US5074149A (en) 1991-03-26 1991-12-24 Xerox Corporation Acoustic wave measurement of the properties of porous materials filled with air and granules
US5131748A (en) 1991-06-10 1992-07-21 Monchalin Jean Pierre Broadband optical detection of transient motion from a scattering surface by two-wave mixing in a photorefractive crystal
DE4127395A1 (de) 1991-08-19 1993-02-25 Siemens Ag Verfahren und vorrichtung zum erkennen und orten von veraenderungen an einem bauteil einer turbine
US5351543A (en) 1991-12-27 1994-10-04 The Regents Of The University Of California, Office Of Technology Transfer Crack detection using resonant ultrasound spectroscopy
US5257544A (en) 1992-01-22 1993-11-02 The Board Of Trustees Of The Leland Stanford Junior University Resonant frequency method for bearing ball inspection
US5406850A (en) 1993-01-14 1995-04-18 Tosoh Smd, Inc. Method of non-destructively testing a sputtering target
US5402235A (en) 1993-07-01 1995-03-28 National Research Council Of Canada Imaging of ultrasonic-surface motion by optical multiplexing
EP0636881B1 (de) 1993-07-24 1998-01-07 Erlus Baustoffwerke Ag Verfahren und Einrichtung zur Qualitätsprüfung von Bauteilen mittels Klangmessung, insbesondere von Keramikartikeln
DE4419750C1 (de) * 1994-06-06 1995-06-22 Siemens Ag Prooftest für keramische Bauteile
US5608166A (en) 1995-10-12 1997-03-04 National Research Council Of Canada Generation and detection of ultrasound with long pulse lasers
US5652389A (en) 1996-05-22 1997-07-29 The United States Of America As Represented By The Secretary Of Commerce Non-contact method and apparatus for inspection of inertia welds
US5713356A (en) 1996-10-04 1998-02-03 Optosonics, Inc. Photoacoustic breast scanner
EP1023595A4 (en) * 1996-11-22 2003-07-09 Perceptron Inc METHOD AND SYSTEM FOR PROCESSING MEASUREMENT SIGNALS FOR OBTAINING A VALUE CONCERNING A PHYSICAL PARAMETER
US5852243A (en) 1997-07-21 1998-12-22 J-Squared, Llc Method and apparatus for detecting a road pavement surface condition
US6043884A (en) 1997-08-08 2000-03-28 Bio-Rad Laboratories, Inc. DSP technique for photoacoustic spectroscopy (PAS) sample pulse response for depth profiling
US6057927A (en) 1998-02-25 2000-05-02 American Iron And Steel Institute Laser-ultrasound spectroscopy apparatus and method with detection of shear resonances for measuring anisotropy, thickness, and other properties
US6104942A (en) 1998-05-12 2000-08-15 Optosonics, Inc. Thermoacoustic tissue scanner
CO4810262A1 (es) 1998-09-11 1999-06-30 Pato Marcos Ruben Bollati Metodo para cuantificacion energetica de materiales compues- tos. . . .

Also Published As

Publication number Publication date
WO2002006814A2 (en) 2002-01-24
CA2411628A1 (en) 2002-01-24
US6684701B2 (en) 2004-02-03
CA2411628C (en) 2009-12-01
IL153807A0 (en) 2003-07-31
AU2002222955A1 (en) 2002-01-30
KR20030015389A (ko) 2003-02-20
JP4789394B2 (ja) 2011-10-12
JP2004515748A (ja) 2004-05-27
EP1301778A2 (en) 2003-04-16
EP1301778B1 (en) 2012-06-13
WO2002006814A3 (en) 2002-09-26
US20020066318A1 (en) 2002-06-06
NO20030183D0 (no) 2003-01-14

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