WO1992021965A1 - Procede et appareil permettant de detecter la corrosion dans des conduits - Google Patents

Procede et appareil permettant de detecter la corrosion dans des conduits Download PDF

Info

Publication number
WO1992021965A1
WO1992021965A1 PCT/DK1992/000174 DK9200174W WO9221965A1 WO 1992021965 A1 WO1992021965 A1 WO 1992021965A1 DK 9200174 W DK9200174 W DK 9200174W WO 9221965 A1 WO9221965 A1 WO 9221965A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
ultrasonic
measuring probe
tubular member
fluid
Prior art date
Application number
PCT/DK1992/000174
Other languages
English (en)
Inventor
Allan Northeved
Michael Svan
Original Assignee
Force Institutterne
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 Force Institutterne filed Critical Force Institutterne
Publication of WO1992021965A1 publication Critical patent/WO1992021965A1/fr

Links

Classifications

    • 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
    • G01N29/221—Arrangements for directing or focusing the acoustical waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • 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
    • G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
    • G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
    • 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
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02854—Length, thickness
    • 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

Definitions

  • the invention relates to a method of inspecting tubular members, especially of measuring the wall thickness of a tubular member, said method comprising the steps of in ⁇ serting a measuring probe with an ultrasonic transducer for transmission of an ultrasonic pulse to the wall of the tubular member and for detection of the ultrasonic pulses reflected by the inner and outer side of the tu ⁇ bular wall, said measuring probe comprising a rotatable, inclined mirror guiding the ultra-sound transmitted by the transducer in form of a beam in order to scan the tubular member along a substantially helical path during the insertion of the probe, where the inclined mirror is arranged in a chamber and caused to rotate by means of an electric motor, an ultra—sound—transmitting fluid be ⁇ ing fed to the space between the measuring probe and the tubular member during the scanning.
  • US-PS No. 4,361,044 discloses a way of rotating an in ⁇ clined mirror placed together with an ultrasonic trans ⁇ ducer in a chamber of a measuring probe, said measuring probe being insertable in a pipe to be examined.
  • the mirror is caused to rotate by means of a motor shaft in the chamber apparently filled with nothing but air.
  • This measuring probe is encumbered with the drawback that the majority of the ultrasonic energy from the transducer is reflected due to the lacking acoustic coupling.
  • Shell International Research has produced a measuring probe, cf. EP Patent Application No. 12,474, where the fluid is fed to the space between the measuring probe and the tubular member during the scanning.
  • the fluid is also used for rotating an inclined mirror reflecting ultrasonic energy from an ultrasonic transducer, said mirror being supported by a water—driven turbine rotat ⁇ ing about a shaft parallel to the longitudinal axis of the probe.
  • a water—driven turbine rotat ⁇ ing about a shaft parallel to the longitudinal axis of the probe.
  • Such a water—driven turbine is, however, encumbered with the drawback that the ac ⁇ curacy involved is not very high because the rotary speed is not particularly accurate.
  • the rotation involves some turbulence with the result that air bubbles, if any, can interfere with the measuring. Both drawbacks limit the scanning speed.
  • the object of the invention is to provide a method of the above type for scanning tubular members, and which allows a higher scanning speed than previously known.
  • the method according to the invention is characterised by the inspection of the tubular member being carried out by placing the rotating mirror in a preferably closed chamber filled with fluid, said chamber being rotated together with the mirror and comprising an ul ⁇ trasonic window for the transmitted ultrasonic beam.
  • turbulence is avoided in the fed water.
  • the risk of possible air bubbles interfering with the ultrasonic transmission and consequently the mea ⁇ suring has been considerably reduced and it is possible to scan at a higher speed than previously.
  • the outer side of the rotatable chamber filled with fluid may furthermore be shaped substantially as a rota- tionally symmetrical body with a generator curve in form of a monotonous function such that air bubbles, if any, automatically move towards the narrowed end during the rotation of the chamber so as to be drained off through outlet openings. In this manner the risk of possible air bubbles interfering with the measuring has been further reduced.
  • the mirror may be rotated by means of at least one DC motor arranged in a fluid-tight cavity inside the measuring probe.
  • the rotary speed of such a motor can be controlled very accurately with the result that an improved resolution is obtained and a higher scanning speed is rendered possible.
  • the driving shaft of the DC motor may according to the invention be sealed relative to the cavity housing the motor by means of a bearing with an iron—containing lu ⁇ bricant in connection with one or more strong annular magnets, whereby a fluid-tight bearing is obtained.
  • the measuring probe with the chamber filled with fluid may according to the invention be centered by means of one or more external resilient portions, said portions being circumferential and partially blocking for water.
  • a resilient portion may for instance be a ' resilient metal tape with a lengthwise bending and a suitable num ⁇ ber of transverse slits.
  • the invention relates furthermore to an apparatus for carrying out the method of inspecting tubular members, especially of measuring the wall thickness of a tubular member, said apparatus comprising a measuring probe for transmission of an ultrasonic pulse to the wall of the tubular member and for detection of the ultrasonic pulses reflected by the inner and outer side of the tu ⁇ bular wall, said measuring probe comprising a rotatable, inclined mirror guiding the ultra-sound transmitted by the transducer in form of a beam in order to scan the tubular member along a substantially helical path during the insertion of the probe, where the inclined mirror is arranged in a chamber and caused to rotate by means of an electric motor, an ultra—sound—transmitting fluid being fed to the space between the measuring probe and the tubular member during the scanning.
  • the rotatable, inclined mirror is arranged in a chamber filled with fluid and is caused to rotate to ⁇ gether with the mirror, said chamber comprising an ul ⁇ trasonic window for the transmitted ultrasonic beam.
  • the resulting apparatus is particularly suited for inspec ⁇ tion of tubular members.
  • the rotation of the chamber Is preferably caused by means of at least one DC motor arranged in a closed cavity of the measuring probe.
  • a DC motor is capable of rotating at a very accurate rotary speed. As a result an improved resolution is obtained during the scanning procedure.
  • the driving shaft of the motor may advantageously be sealed relative to the closed cavity by means of a bearing with an iron—containing lubricant in connection with one or more strong annular magnets .
  • the magnets retain the lubricant and provide a fluid—tight sealing.
  • Fig. 1A and IB illustrate a measuring probe to be in— serted in tubular members to be inspected
  • Fig. 2 Illustrates a centering means for the measuring probe
  • Fig. 3 illustrates an alternative embodiment of the mea ⁇ suring probe.
  • the apparatus shown in Figs. 1A and IB for inspection of tubular members, especially for measuring of the wall thickness of said tubular members, comprises a measuring probe to be inserted in said tubular members.
  • the mea- suring probe comprises a tubular housing 2 including one or more electric motors 4 in response to the necessary torque.
  • the driving shafts of said motors are interconnected through non- rigid couplings.
  • the projecting driving shaft of the front motor 4 extends by means of a shaft coupling 6 through a fixed primary winding of a transformer and is fixedly connected to the secondary winding 8 capable of rotating relative to said primary winding 7.
  • the secon ⁇ dary winding 8 of the transformer is secured to the end of a hollow shaft 10 housing conduits to an ultrasonic ' transducer 12 which is mounted at the opposite end of the shaft 10.
  • Adjacent the secondary winding 8, the hol ⁇ low shaft 10 is mounted in a bearing, preferably a ball bearing 13 fixedly arranged inside the tubular housing 2.
  • the ball bearing 13 is followed by a magnetic sealing 16 in form of a bearing with iron-containing lubricant in connection with strong annular magnets. The magnets retain the iron-containing lubricant although the bear ⁇ ing is subjected to a fluid pressure. As a result, a fluid-tight sealing is provided.
  • the magnetic sealing 15 is followed by another fixedly arranged ball bearing 17 housing the hollow shaft 10.
  • the hollow shaft 10 pro ⁇ jecting from the bearing 17 is secured to a cylindrical and axially mounted ultrasonic transducer 12.
  • the ultra- sonic transducer 12 communicates with the conduits in the shaft 10 and is activated by means of the signal fed through the transformer 7, 8 with the rotatable secon ⁇ dary winding 8.
  • a signal of a frequency of about 5 to 15 MHz is fed to the primary winding 7 from a preamplifier 19 mounted on a circuit card behind the electric motor 4 in a fluid-tight cavity.
  • a control circuit for the elec ⁇ tric motor 4 is also mounted on said circuit card. The control circuit ensures that the motor 4 rotates at the desired speed of rotation which must be constant.
  • the motor 4 is a DC motor because such a motor can be pro ⁇ quizd with very small dimensions.
  • a chamber 20 filled with fluid is mounted in front of the cylindrical and axially arranged ultrasonic trans ⁇ ducer 12, said chamber 20 housing an inclined ultra ⁇ sound-reflecting plate 22.
  • the plate 22 forms preferably an angle of about 45° with the axis of the tubular hous ⁇ ing 2.
  • the ultrasonic beam reflected by the plate 22 through an ultrasonic window in the chamber 20 follows thereby a helical path if the transducer 12 and the mir ⁇ ror 22 rotate at a constant speed and the measuring probe is moved at a constant speed in for instance a pipe .
  • Centering means 23 on the outer side of the tubular housing 2 of the measuring probe are adapted to center said measuring probe inside the pipe to be inspected.
  • the centering means 23 are formed by resilient portions which are circum erential and water—permeable , cf . Fig. 2.
  • Each resilient portion is formed by a tape of resi ⁇ lient metal which is bent lengthweise and slit trans ⁇ versely at suitable intervals. The tape is placed about the tubular housing 2. One edge of the tape is secured to the tubular housing 2 whereas the other edge is dis— placeable in response to the diameter of the pipe to be inspected.
  • the slitting ensures both the desired cen ⁇ tering and a partial blocking for water.
  • the centering means 23 need not necessarily be made of a resilient metal sheet, but may also be made of another resilient sheet material.
  • water has been fed to the space between the ultra ⁇ sonic probe and the pipe to be inspected.
  • the water is fed through a hose 25 connected with the probe and is discharged through two outlets 26 from the probe to the space between said probe and the pipe to be inspected.
  • a stop disc 27 is mounted at the end of the chamber 20 filled with fluid and housing the inclined mirror 22.
  • the stop disc 27 stops the flow of water to a predeter- mined degree and ensures that the space between the pipe and the chamber 20 is filled with water.
  • Fig. 3 illustrates a particularly preferred embodiment, where the chamber filled with fluid is shaped as a sub ⁇ stantially rotationally symmetrical body with a mono- tonous generator curve and preferably being conical in such a manner that air bubbles, if any, are automatical ⁇ ly collected due to the centrifugal forces at the nar ⁇ rowed end of the conical surface provided with the stop disc 27. If the stop disc 27 is provided with openings 28 for the discharging of air bubbles, said bubbles can ⁇ not influence the ultrasonic transmission during the measuring procedure.
  • the method used for measuring the wall thickness is based on the pulse-echo-technique.
  • the measuring probe is moved axially inside the pipe.
  • the transducer 12 transmits an ultrasonic pulse towards the shaft of the tubular housing 2..
  • the pulse is deflected about 90° by the rotating mirror 22 and reaches the pipe to be in ⁇ spected.
  • the rotation of the mirror 22 has the effect that the inner side of the pipe is scanned along a heli ⁇ cal path.
  • Some of the ultrasonic energy is reflected by the inner side of the pipe wall.
  • the remaining ultrason ⁇ ic energy penetrates the wall and reaches the other sur ⁇ face, i.e. the outer side of the pipe wall, where the majority of the ultrasonic energy is reflected.
  • the method according to the invention may for instance be used for inspecting pipes in heat exchangers compris ⁇ ing hundreds of pipes.
  • a corrosion in the pipes may in ⁇ volve serious accidents and high losses of profits in case it is necessary to repair a heat exchanger.
  • a hydraulic or pneumatic motor can be used instead of an electric motor, where a separate in- and outlet for fluid or air Is provided.
  • a code disc is also provided which trans ⁇ fers the angular turning to a computer through electric conduits .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

Procédé permettant de contrôler des éléments tubulaires, notamment de mesurer l'épaisseur d'une paroi de l'élément tubulaire, ledit procédé comprenant des étapes d'insertion d'une sonde de mesure équipée d'un transducteur à ultrasons (12) afin de transmettre une pulsation ultrasonique à la paroi de l'élément tubulaire et dedétecter des pulsations ultrasoniques renvoyées par le côté interne et externe de la paroi tubulaire. La sonde est constituée d'un miroir incliné guidant les ultrasons transmis par le transducteur sous forme d'un faisceau afin de balayer l'élément tubulaire avec une trajectoire sensiblement hélicoïdale pendant l'insertion de la sonde; d'un fluide d'émission d'ultrasons amené à un espace circulaire situé entre la sonde et l'élément tubulaire lors du balayage. D'après l'invention, le miroir rotatif (22) est placé dans une chambre de préférence fermée (20) remplie de fluide, ladite chambre (20) tournant avec le miroir (22) et comprenant une fenêtre ultrasonique pour le passage du faisceau ultrasonique. On réduit de cette manière toute turbulence dans l'eau. En conséquence, le risque de bulles d'air interférant avec le mesurage a été considérablement réduit, et il est donc possible de pratiquer un balayage à une vitesse plus élevée qu'auparavant.
PCT/DK1992/000174 1991-05-31 1992-05-29 Procede et appareil permettant de detecter la corrosion dans des conduits WO1992021965A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1047/91 1991-05-31
DK104791A DK169900B1 (da) 1991-05-31 1991-05-31 Fremgangsmåde og apparat til detektion af tæring i rør

Publications (1)

Publication Number Publication Date
WO1992021965A1 true WO1992021965A1 (fr) 1992-12-10

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PCT/DK1992/000174 WO1992021965A1 (fr) 1991-05-31 1992-05-29 Procede et appareil permettant de detecter la corrosion dans des conduits

Country Status (3)

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AU (1) AU1901292A (fr)
DK (1) DK169900B1 (fr)
WO (1) WO1992021965A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294764A (en) * 1994-11-03 1996-05-08 Lyonnaise Eaux Eclairage Ultrasonic pipe wall thickness measuring apparatus
NL1026538C2 (nl) * 2004-07-01 2006-01-03 Roentgen Tech Dienst Bv Een werkwijze en samenstel voor het detecteren van een scheur in een pijpleiding vanaf een binnenzijde van de pijpleiding.
WO2009085849A3 (fr) * 2007-12-20 2009-09-17 Silicon Valley Medical Instruments, Inc. Boîtier de sonde d'image avec liquide de rinçage
GB2468301A (en) * 2009-03-03 2010-09-08 Jd7 Ltd Water mains inspection and servicing system
US9521990B2 (en) 2011-05-11 2016-12-20 Acist Medical Systems, Inc. Variable-stiffness imaging window and production method thereof
US20170153207A1 (en) * 2014-08-11 2017-06-01 Eye-Life As Ultrasonic scanner with a magnetic coupling between a motor and a mirror
US10905851B2 (en) 2012-03-23 2021-02-02 Acist Medical Systems, Inc. Catheter sheath and methods thereof
CN115308308A (zh) * 2022-10-10 2022-11-08 山东广悦化工有限公司 一种柴油管道防腐检测装置及其使用方法
US11666309B2 (en) 2013-12-19 2023-06-06 Acist Medical Systems, Inc. Catheter sheath system and method
CN116642959A (zh) * 2023-07-26 2023-08-25 山东泰阳特种设备检测科技有限公司 一种管道电磁超声检测装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008603A (en) * 1975-12-29 1977-02-22 Shell Oil Company Ultrasonic method and apparatus for measuring wall thickness of tubular members
US4084582A (en) * 1976-03-11 1978-04-18 New York Institute Of Technology Ultrasonic imaging system
US4212207A (en) * 1978-12-14 1980-07-15 Shell Oil Company Ultrasonic tube inspection
US4361044A (en) * 1980-12-09 1982-11-30 The United States Of America As Represented By The United States Department Of Energy Scanning ultrasonic probe
DE3131883A1 (de) * 1981-08-12 1983-03-03 Bundesrepublik Deutschland, vertreten durch den Bundesminister für Wirtschaft in Bonn, dieser vertreten durch den Präsidenten der Bundesanstalt für Materialprüfung (BAM), 1000 Berlin Innenrohr-messsonde nach dem ultraschall-impulsechoverfahren zur wanddickenmessung an narbigen oberflaechen, vorzugsweise zum nachweis von korrosion in rohren
GB2142726A (en) * 1983-06-24 1985-01-23 Atomic Energy Authority Uk Ultrasonic scanning probe
US4597294A (en) * 1984-06-25 1986-07-01 Westinghouse Electric Corp. Ultrasonic nondestructive tubing inspection system
US4674515A (en) * 1984-10-26 1987-06-23 Olympus Optical Co., Ltd. Ultrasonic endoscope
US4824122A (en) * 1987-03-02 1989-04-25 Ferrofluidics Corporation Compact magnetic fluid low pressure seal

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008603A (en) * 1975-12-29 1977-02-22 Shell Oil Company Ultrasonic method and apparatus for measuring wall thickness of tubular members
US4084582A (en) * 1976-03-11 1978-04-18 New York Institute Of Technology Ultrasonic imaging system
US4212207A (en) * 1978-12-14 1980-07-15 Shell Oil Company Ultrasonic tube inspection
US4361044A (en) * 1980-12-09 1982-11-30 The United States Of America As Represented By The United States Department Of Energy Scanning ultrasonic probe
DE3131883A1 (de) * 1981-08-12 1983-03-03 Bundesrepublik Deutschland, vertreten durch den Bundesminister für Wirtschaft in Bonn, dieser vertreten durch den Präsidenten der Bundesanstalt für Materialprüfung (BAM), 1000 Berlin Innenrohr-messsonde nach dem ultraschall-impulsechoverfahren zur wanddickenmessung an narbigen oberflaechen, vorzugsweise zum nachweis von korrosion in rohren
GB2142726A (en) * 1983-06-24 1985-01-23 Atomic Energy Authority Uk Ultrasonic scanning probe
US4597294A (en) * 1984-06-25 1986-07-01 Westinghouse Electric Corp. Ultrasonic nondestructive tubing inspection system
US4674515A (en) * 1984-10-26 1987-06-23 Olympus Optical Co., Ltd. Ultrasonic endoscope
US4824122A (en) * 1987-03-02 1989-04-25 Ferrofluidics Corporation Compact magnetic fluid low pressure seal

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 10, No. 52, P432; & JP,A,60 196 662, 05-10-1985, MITSUBISHI JUKOGYO K.K. *
PATENT ABSTRACTS OF JAPAN, Vol. 10, No. 64, P436; & JP,A,60 205 254, 16-10-1985, NIPPON KOGYO K.K. *
PATENT ABSTRACTS OF JAPAN, Vol. 12, No. 175, P707; & JP,A,62 285 060, 10-12-1987, NIPPON MINING CO LTD. *

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294764A (en) * 1994-11-03 1996-05-08 Lyonnaise Eaux Eclairage Ultrasonic pipe wall thickness measuring apparatus
FR2726642A1 (fr) * 1994-11-03 1996-05-10 Lyonnaise Eaux Eclairage Procede de mesure par ultrasons de l'epaisseur d'une canalisation d'eau et dispositif de mise en oeuvre de ce procede
ES2112775A1 (es) * 1994-11-03 1998-04-01 Lyonnaise Eaux Eclairage Dispositivo de medicion por ultrasonidos del espesor de una conduccion de agua.
GB2294764B (en) * 1994-11-03 1999-03-24 Lyonnaise Eaux Eclairage Apparatus using ultrasound to measure the wall thickness of water pipework
NL1026538C2 (nl) * 2004-07-01 2006-01-03 Roentgen Tech Dienst Bv Een werkwijze en samenstel voor het detecteren van een scheur in een pijpleiding vanaf een binnenzijde van de pijpleiding.
WO2006004402A1 (fr) * 2004-07-01 2006-01-12 Röntgen Technische Dienst B.V. Procede et appareil de detection d'une fissure dans une conduite depuis l'interieur de la conduite a l'aide d'ultrasons
US9198638B2 (en) 2007-12-20 2015-12-01 Acist Medical Systems, Inc. Imaging probe housing with fluid flushing
US10420456B2 (en) 2007-12-20 2019-09-24 Acist Medical Systems, Inc. Imaging probe housing with fluid flushing
JP2011507619A (ja) * 2007-12-20 2011-03-10 シリコンバレー メディカル インスツルメンツ インコーポレイテッド 流体フラッシング機能付き画像処理プローブハウジング
US8167809B2 (en) 2007-12-20 2012-05-01 Silicon Valley Medical Instruments, Inc. Imaging probe housing with fluid flushing
US11627869B2 (en) 2007-12-20 2023-04-18 Acist Medical Systems, Inc. Imaging probe housing with fluid flushing
JP2014057866A (ja) * 2007-12-20 2014-04-03 Silicon Valley Medical Instruments Inc 流体フラッシング機能付き画像処理用プローブ及び画像処理方法
WO2009085849A3 (fr) * 2007-12-20 2009-09-17 Silicon Valley Medical Instruments, Inc. Boîtier de sonde d'image avec liquide de rinçage
GB2468301B (en) * 2009-03-03 2013-06-12 Jd7 Ltd Water mains inspection and servicing
GB2468301A (en) * 2009-03-03 2010-09-08 Jd7 Ltd Water mains inspection and servicing system
US9234812B2 (en) 2009-03-03 2016-01-12 Jd7 Limited Water mains inspection and servicing
US9521990B2 (en) 2011-05-11 2016-12-20 Acist Medical Systems, Inc. Variable-stiffness imaging window and production method thereof
US11147535B2 (en) 2011-05-11 2021-10-19 Acist Medical Systems, Inc. Variable-stiffness imaging window and production method thereof
US10905851B2 (en) 2012-03-23 2021-02-02 Acist Medical Systems, Inc. Catheter sheath and methods thereof
US11666309B2 (en) 2013-12-19 2023-06-06 Acist Medical Systems, Inc. Catheter sheath system and method
US20170153207A1 (en) * 2014-08-11 2017-06-01 Eye-Life As Ultrasonic scanner with a magnetic coupling between a motor and a mirror
CN115308308B (zh) * 2022-10-10 2022-12-13 山东广悦化工有限公司 一种柴油管道防腐检测装置及其使用方法
CN115308308A (zh) * 2022-10-10 2022-11-08 山东广悦化工有限公司 一种柴油管道防腐检测装置及其使用方法
CN116642959A (zh) * 2023-07-26 2023-08-25 山东泰阳特种设备检测科技有限公司 一种管道电磁超声检测装置
CN116642959B (zh) * 2023-07-26 2023-09-26 山东泰阳特种设备检测科技有限公司 一种管道电磁超声检测装置

Also Published As

Publication number Publication date
DK169900B1 (da) 1995-03-27
DK104791D0 (da) 1991-05-31
AU1901292A (en) 1993-01-08
DK104791A (da) 1992-12-01

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