CA2858401C - Ultrasound testing - Google Patents
Ultrasound testing Download PDFInfo
- Publication number
- CA2858401C CA2858401C CA2858401A CA2858401A CA2858401C CA 2858401 C CA2858401 C CA 2858401C CA 2858401 A CA2858401 A CA 2858401A CA 2858401 A CA2858401 A CA 2858401A CA 2858401 C CA2858401 C CA 2858401C
- Authority
- CA
- Canada
- Prior art keywords
- pulse
- reflection
- image
- sound
- structural feature
- 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.)
- Active
Links
- 238000002604 ultrasonography Methods 0.000 title description 25
- 238000012360 testing method Methods 0.000 title description 2
- 238000003384 imaging method Methods 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 210000004209 hair Anatomy 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012285 ultrasound imaging Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/523—Details of pulse systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating 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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating 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
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/225—Supports, positioning or alignment in moving situation
- G01N29/226—Handheld or portable devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating 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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/50—Processing the detected response signal, e.g. electronic circuits specially adapted therefor using auto-correlation techniques or cross-correlation techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/523—Details of pulse systems
- G01S7/524—Transmitters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/523—Details of pulse systems
- G01S7/526—Receivers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1314483.7 | 2013-08-13 | ||
| GBGB1314483.7A GB201314483D0 (en) | 2013-08-13 | 2013-08-13 | Ultrasound testing |
| GB1413618.8 | 2014-07-31 | ||
| GB1413618.8A GB2521888B (en) | 2013-08-13 | 2014-07-31 | Ultrasound testing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2858401A1 CA2858401A1 (en) | 2015-02-13 |
| CA2858401C true CA2858401C (en) | 2022-06-21 |
Family
ID=49262108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2858401A Active CA2858401C (en) | 2013-08-13 | 2014-08-05 | Ultrasound testing |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US20150049579A1 (enExample) |
| JP (1) | JP2015036677A (enExample) |
| BR (1) | BR102014019592A2 (enExample) |
| CA (1) | CA2858401C (enExample) |
| DE (1) | DE202013105255U1 (enExample) |
| GB (2) | GB201314483D0 (enExample) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201314483D0 (en) | 2013-08-13 | 2013-09-25 | Dolphitech As | Ultrasound testing |
| GB201316656D0 (en) | 2013-09-19 | 2013-11-06 | Dolphitech As | Sensing apparatus using multiple ultrasound pulse shapes |
| WO2017138005A2 (en) * | 2016-02-14 | 2017-08-17 | Earlysense Ltd. | Apparatus and methods for monitoring a subject |
| US10641738B2 (en) * | 2017-07-20 | 2020-05-05 | Airbus (S.A.S.) | Device and method for non-destructive ultrasound inspection of structures made of composite material |
| US20250251448A1 (en) * | 2024-02-02 | 2025-08-07 | Feng Chia University | Defect detection module |
Family Cites Families (61)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2804614A (en) | 1951-02-23 | 1957-08-27 | Luis W Alvarez | Suppressed side-lobe radio receiving system |
| FR1514156A (fr) * | 1966-11-08 | 1968-02-23 | Realisations Ultrasoniques Sa | Appareil de mesure de niveaux par réflexion d'impulsions ultrasonores |
| US3723952A (en) | 1970-05-26 | 1973-03-27 | Raytheon Co | Apparatus for differentiating between side lobe and main lobe returns in depth sounding systems |
| US3778756A (en) | 1972-09-01 | 1973-12-11 | Gen Electric | Method and apparatus for visual imaging of ultrasonic echo signals utilizing a single transmitter |
| US3895525A (en) * | 1973-10-03 | 1975-07-22 | Gen Electric | Acoustic imaging apparatus for visual display with depth perception |
| US4159462A (en) | 1977-08-18 | 1979-06-26 | General Electric Company | Ultrasonic multi-sector scanner |
| US4169257A (en) * | 1978-04-28 | 1979-09-25 | The United States Of America As Represented By The Secretary Of The Navy | Controlling the directivity of a circular array of acoustic sensors |
| US4325257A (en) | 1980-02-20 | 1982-04-20 | Kino Gordon S | Real-time digital, synthetic-focus, acoustic imaging system |
| GB2109555B (en) | 1981-11-16 | 1985-09-04 | Raymond Engineering | Ultrasonic testing method and apparatus |
| US4441369A (en) * | 1982-09-30 | 1984-04-10 | General Electric Company | Ultrasonic detection of extended flaws |
| JPS60102553A (ja) | 1983-11-09 | 1985-06-06 | Hitachi Ltd | 電子走査型超音波探傷装置 |
| JPS60102554A (ja) | 1983-11-09 | 1985-06-06 | Hitachi Ltd | 超音波探触子 |
| GB8718717D0 (en) * | 1987-08-07 | 1987-09-16 | Sonin Inc | Measuring distances |
| DE4040190C2 (de) | 1990-12-15 | 1994-08-04 | Kernforschungsz Karlsruhe | Verfahren zur Laufzeitmessung von Ultraschall bei der Impuls-Reflexionsmethode |
| US5235985A (en) | 1992-04-30 | 1993-08-17 | Mcmorrow Gerald J | Automatic bladder scanning apparatus |
| US5383366A (en) * | 1992-10-26 | 1995-01-24 | The United States Of America As Represented By The Secretary Of The Navy | Ultrasonic two probe system for locating and sizing |
| US5396890A (en) | 1993-09-30 | 1995-03-14 | Siemens Medical Systems, Inc. | Three-dimensional scan converter for ultrasound imaging |
| GB2286678B (en) | 1994-02-18 | 1998-08-19 | Technical Software Consultants | A probe for an ACFM uniform field array testing system |
| US5630208A (en) * | 1994-07-19 | 1997-05-13 | Trimble Navigation Limited | Adaptive multipath equalization |
| JPH0875714A (ja) | 1994-09-02 | 1996-03-22 | Hihakai Kensa Kk | 探傷試験方法及び探触子 |
| US5773811A (en) | 1994-10-11 | 1998-06-30 | Schramm, Jr.; Harry F. | Method for marking, capturing and decoding machine-readable matrix symbols using ultrasound imaging techniques |
| JP3242887B2 (ja) | 1998-09-21 | 2001-12-25 | 松下電器産業株式会社 | 超音波診断装置 |
| US6245016B1 (en) * | 1999-03-12 | 2001-06-12 | General Electric Company | Ultrasound imaging system having post-beamformer signal processing using deconvolution algorithm |
| US6748259B1 (en) * | 2000-06-15 | 2004-06-08 | Spectros Corporation | Optical imaging of induced signals in vivo under ambient light conditions |
| US6614384B2 (en) | 2000-09-14 | 2003-09-02 | Time Domain Corporation | System and method for detecting an intruder using impulse radio technology |
| JP3579646B2 (ja) | 2000-11-21 | 2004-10-20 | ペンタックス株式会社 | 超音波内視鏡 |
| US6527723B2 (en) * | 2001-06-26 | 2003-03-04 | Koninklijke Philips Electronics N.V. | Variable multi-dimensional apodization control for ultrasonic transducers |
| US6732587B2 (en) * | 2002-02-06 | 2004-05-11 | Lockheed Martin Corporation | System and method for classification of defects in a manufactured object |
| US6858008B2 (en) * | 2002-02-21 | 2005-02-22 | Acuson Corporation | Automatic ultrasound transmit power setting method and system |
| EP1631840A2 (en) | 2003-06-09 | 2006-03-08 | Brown University | Estimation of background noise and its effect on sonar range estimation |
| US7222514B2 (en) * | 2004-06-21 | 2007-05-29 | The Boeing Company | Laminate material testing methods and systems |
| ATE346548T1 (de) | 2004-07-29 | 2006-12-15 | Fujinon Corp | Ultraschall-endoskop |
| JP4444150B2 (ja) | 2005-03-31 | 2010-03-31 | 株式会社東芝 | フィルタ装置 |
| US7454973B2 (en) * | 2005-04-01 | 2008-11-25 | Hitachi, Ltd. | Ultrasonic inspection method and ultrasonic inspection equipment |
| WO2007016605A2 (en) | 2005-08-01 | 2007-02-08 | Covaris, Inc. | An apparatus and a method for processing a sample using acoustic energy |
| GB2432671A (en) | 2005-11-29 | 2007-05-30 | Dolphiscan As | Ultrasonic transducer with transmitter layer and receiver layer each having elongated electrodes |
| US7874991B2 (en) | 2006-06-23 | 2011-01-25 | Teratech Corporation | Ultrasound 3D imaging system |
| US7617730B2 (en) | 2006-06-28 | 2009-11-17 | The Boeing Company | Ultrasonic inspection and repair mode selection |
| US20080208061A1 (en) | 2007-02-23 | 2008-08-28 | General Electric Company | Methods and systems for spatial compounding in a handheld ultrasound device |
| WO2008137030A1 (en) | 2007-05-01 | 2008-11-13 | The Regents Of The University Of California | A flexible conformal ultrasonic imaging transducer and system |
| US20090082673A1 (en) | 2007-09-26 | 2009-03-26 | Xuanming Lu | Semiconductor matching layer in a layered ultrasound transducer array |
| JP4975829B2 (ja) | 2007-12-25 | 2012-07-11 | パナソニック株式会社 | 超音波診断装置 |
| CN102014757B (zh) | 2008-04-25 | 2013-03-13 | 株式会社日立医疗器械 | 超声波诊断装置 |
| EP2151698A1 (en) * | 2008-07-28 | 2010-02-10 | Siemens Milltronics Process Instruments Inc. | Signal processing of signals in pulse-echo measuring systems |
| JP2010060520A (ja) | 2008-09-05 | 2010-03-18 | Osaka Prefecture | 超音波の変復調方法並びに距離検出方法、通信方法 |
| US7675045B1 (en) | 2008-10-09 | 2010-03-09 | Los Alamos National Security, Llc | 3-dimensional imaging at nanometer resolutions |
| ES2379410T3 (es) | 2008-10-14 | 2012-04-25 | Dolphiscan As | Aparato de tratamiento de imágenes por ultrasonido para leer y decodificar símbolos de matriz legibles por máquina |
| CA2744208C (en) * | 2008-11-20 | 2015-05-26 | Mbda Uk Limited | Target scene generator |
| EP2249152A3 (en) * | 2009-05-05 | 2012-09-26 | Olympus NDT | A method and system for distance gain sizing using phased array systems |
| KR101107154B1 (ko) | 2009-09-03 | 2012-01-31 | 한국표준과학연구원 | 초음파 탐상장치의 멀티 탐촉자 유닛 |
| CN102781337A (zh) | 2010-01-19 | 2012-11-14 | 皇家飞利浦电子股份有限公司 | 成像装置 |
| JP5636298B2 (ja) | 2011-01-25 | 2014-12-03 | 日立アロカメディカル株式会社 | 超音波診断装置 |
| US9354206B2 (en) | 2011-07-25 | 2016-05-31 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Floating ultrasonic transducer inspection system and method for nondestructive evaluation |
| KR101672916B1 (ko) * | 2012-04-24 | 2016-11-04 | 미쯔비시 가꼬끼 가이샤 리미티드 | 적층체의 박리검사방법 및 박리검사장치 |
| CN102680583A (zh) | 2012-05-23 | 2012-09-19 | 苏州脉科库博环保科技有限公司 | 一种带绝缘性能的刚柔结合压电夹层 |
| GB201314483D0 (en) | 2013-08-13 | 2013-09-25 | Dolphitech As | Ultrasound testing |
| GB201314481D0 (en) | 2013-08-13 | 2013-09-25 | Dolphitech As | Imaging apparatus |
| GB2518817B (en) | 2013-08-23 | 2020-12-16 | Dolphitech As | Sensor module with adaptive backing layer |
| GB201316656D0 (en) | 2013-09-19 | 2013-11-06 | Dolphitech As | Sensing apparatus using multiple ultrasound pulse shapes |
| DE202013105252U1 (de) | 2013-11-20 | 2014-02-26 | Dolphitech As | Sensormodul mit anpassungsfähiger Trägerschicht |
| CN104656074B (zh) | 2014-12-26 | 2018-02-02 | 中国科学院声学研究所 | 一种加权的鲁棒性宽带波束形成目标检测方法 |
-
2013
- 2013-08-13 GB GBGB1314483.7A patent/GB201314483D0/en not_active Ceased
- 2013-11-04 US US14/071,199 patent/US20150049579A1/en not_active Abandoned
- 2013-11-13 JP JP2013235280A patent/JP2015036677A/ja not_active Withdrawn
- 2013-11-20 DE DE202013105255.8U patent/DE202013105255U1/de not_active Expired - Lifetime
-
2014
- 2014-07-31 GB GB1413618.8A patent/GB2521888B/en active Active
- 2014-08-05 CA CA2858401A patent/CA2858401C/en active Active
- 2014-08-07 BR BR102014019592A patent/BR102014019592A2/pt not_active IP Right Cessation
-
2017
- 2017-12-28 US US15/856,658 patent/US10866314B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US10866314B2 (en) | 2020-12-15 |
| BR102014019592A2 (pt) | 2015-11-17 |
| DE202013105255U1 (de) | 2014-02-26 |
| GB201413618D0 (en) | 2014-09-17 |
| GB201314483D0 (en) | 2013-09-25 |
| JP2015036677A (ja) | 2015-02-23 |
| US20180120425A1 (en) | 2018-05-03 |
| GB2521888A (en) | 2015-07-08 |
| GB2521888B (en) | 2018-01-03 |
| CA2858401A1 (en) | 2015-02-13 |
| US20150049579A1 (en) | 2015-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2858409C (en) | Imaging apparatus | |
| US10866314B2 (en) | Ultrasound testing | |
| US8998812B2 (en) | Ultrasound method and probe for electromagnetic noise cancellation | |
| EP4169451B1 (en) | Methods for improving ultrasound image quality by applying weighting factors | |
| IL281888B2 (en) | An image reconstruction method based on non-linear mapping | |
| CN104730148B (zh) | 基于超声检测技术的金属材料内部夹杂物三维重构方法 | |
| US10073174B2 (en) | Sensing apparatus using multiple ultrasound pulse shapes | |
| US20240036008A1 (en) | Ultrasound scanning system with adaptive signal transmission timing | |
| CN112617898B (zh) | 用于超声成像中的闪烁抑制的系统和方法 | |
| Higuti et al. | Damage characterization using guided-wave linear arrays and image compounding techniques | |
| US20240302329A1 (en) | Calibrating an ultrasound apparatus | |
| US20240329003A1 (en) | Calibrating an ultrasound apparatus using matrix-matrix through transmisison | |
| CN115721335B (zh) | 用于波束形成声速选择的系统和方法 | |
| CN114403921A (zh) | 一种基于实时曲线追踪技术的剪切波速度估算方法及系统 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20190705 |
|
| EEER | Examination request |
Effective date: 20190705 |
|
| EEER | Examination request |
Effective date: 20190705 |