EP0766822A1 - Dispositif permettant de mesurer les irregularites de parois interieures de cuves, a l'aide d'ultrasons - Google Patents

Dispositif permettant de mesurer les irregularites de parois interieures de cuves, a l'aide d'ultrasons

Info

Publication number
EP0766822A1
EP0766822A1 EP95924924A EP95924924A EP0766822A1 EP 0766822 A1 EP0766822 A1 EP 0766822A1 EP 95924924 A EP95924924 A EP 95924924A EP 95924924 A EP95924924 A EP 95924924A EP 0766822 A1 EP0766822 A1 EP 0766822A1
Authority
EP
European Patent Office
Prior art keywords
ultrasound
wall
emitters
hollow cylinder
tube
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.)
Withdrawn
Application number
EP95924924A
Other languages
German (de)
English (en)
Inventor
Wolfgang Müller
Friedhelm Walte
Hans Rieder
Frank Bonitz
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP0766822A1 publication Critical patent/EP0766822A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • B06B1/0655—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of cylindrical shape
    • 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
    • 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
    • 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
    • G01N2291/056—Angular incidence, angular propagation
    • 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
    • G01N2291/10—Number of transducers
    • G01N2291/106—Number of transducers one or more transducer arrays
    • 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
    • G01N2291/26—Scanned objects
    • G01N2291/263—Surfaces
    • G01N2291/2636—Surfaces cylindrical from inside

Definitions

  • the invention relates to a device for measuring irregularities in the inner walls of a container by means of ultrasound, with ultrasound emitters, an excitation device for exciting the ultrasound emitters for emitting ultrasound, the ultrasound emitters being arranged in groups such that the ultrasound emitted by a group is in each case on an inside wall of the container or in a certain depth can be focused under the inner wall of the container, and with a detection device for detecting the ultrasound reflected on the inner wall of the container or of errors at a certain depth under the inner wall of the container.
  • Such a device is known from EP 0 493 146 A1. It is used in particular to measure irregularities such as imperfections and changes in wall thickness in pipes.
  • the ultrasound emitters are usually arranged in the form of a ring on an outer surface of a cylinder.
  • the cylinder serves as a test system carrier and is arranged concentrically with respect to the pipe to be tested.
  • the pipe is usually filled with water.
  • the cylinder is moved through the water-filled tube.
  • the irregularities in the inner tube walls are measured by detecting the ultrasound emitted by the ultrasound emitters, reflected on the inner tube wall and by defects at a certain depth under the inner wall of the container and detected by the detection device.
  • the detection capability of this known device is limited in that the focusing of a group of ultrasound emitters is difficult.
  • this is due to the fact that, due to the annular arrangement, the individual ultrasound radiators in a group radiate away from one another, which results in natural defocusing of the sound field.
  • the distance between the inner tube wall to be measured and the cylindrical test system is small, which has the consequence that the sound fields of only a few of the individual ultrasound emitters can be superimposed. The focus of the test system is therefore poor.
  • the invention has for its object to provide a generic device with a better ability to detect defects.
  • This arrangement ensures that the sound fields emitted by the individual ultrasound emitters are directed towards one another. Due to the concave arrangement of the ultrasound emitters arranged in groups, natural focusing of the entire ultrasound field of the ultrasound emitters is achieved in the direction of the container wall, so that improved focusing can be achieved with the device.
  • the ultrasound emitters are advantageously arranged on the inner surface of a hollow cylinder. This is expedient if the device is used to measure inner tube walls and errors at a certain depth below the inner tube wall, since the hollow cylinder can then be arranged axially symmetrically in the tube.
  • the ultrasound emitters can be arranged in a ring on the inner surface of the hollow cylinder. In addition to the better focusing due to the concave inner surface of the hollow cylinder, the focusing is improved in this arrangement in that the distance between the ultrasound emitters and the container / tube inner wall to be measured and errors are below a certain depth the inner tube wall on which the ultrasound is focused is relatively large.
  • the hollow cylinder is permeable to ultrasound on the side opposite the ultrasound emitters. Then the ultrasound field of the ultrasound emitters or a group of the ultrasound emitters can be selected such that the ultrasound is emitted in a direction perpendicular to the hollow cylinder surface.
  • the ultrasound can emerge from the latter on the permeable side of the hollow cylinder and impinge on the inner wall of the tube or at a certain depth below the inner tube wall, on which it is focused, the inner tube wall or the location underneath for irregularities in the form of defects, Cracks, corrosion ect. is checked.
  • the ultrasound emitters can be arranged on wall segments of the hollow cylinder, and the hollow cylinder can each have a recess in relation to the wall segments. In this way, a mechanically simple implementation of the hollow cylinder according to the invention is achieved.
  • the wall segments can be designed as strips which are symmetrical to the hollow cylinder axis along a partial circumference of the hollow cylinder.
  • the wall segments are then arranged in planes perpendicular to the hollow cylinder axis and a simple geometry results.
  • the wall segments can be offset both radially and axially from one another.
  • Inner pipe wall and the underlying volume areas are covered.
  • the recesses in the Hollow cylinder formed automatically.
  • the wall segments can be axially spaced apart and connected to one another via connecting elements.
  • the entire hollow cylinder wall can thus be formed in a simple manner from wall segments.
  • the wall segments can also be radially offset from one another in such a way that the wall segment which is axially adjacent to a first wall segment forms the radial continuation of the first wall segment, and the entire hollow cylinder circumference is covered by the wall segments.
  • the sound fields of the ultrasound emitters which are arranged on the wall segments, can be focused on the entire circumference of the inner tube wall to be measured or to a certain depth below the inner tube wall, and the inner tube wall can be measured at various points along the tube length.
  • the wall of the hollow cylinder can be designed as a spirally arranged band-like strip.
  • This spiral arrangement ensures that the region of the hollow cylinder opposite the band or the ultrasound emitter arranged thereon has no material and is therefore permeable to the ultrasound.
  • the slope of the spiral must be chosen appropriately so that the ultrasound emitted by the ultrasound emitters can be directed onto the opposite inner tube wall to be measured.
  • a group of the ultrasound emitters is arranged inclined. Then an area of the inner tube wall and of defects at a certain depth under the inner tube wall can also be measured, which does not lie opposite the ultrasonic radiators in the plane perpendicular to the hollow cylinder axis, but rather lies above or below it. With such an inclined arrangement of the individual elements, different focusing in the tube axis direction can be achieved.
  • a group of the ultrasound emitters can be arranged inclined in such a way that their ultrasound fields radiate past an opposite end of the hollow cylinder.
  • a normal hollow cylinder with a continuous cylinder wall can be used, which in its production is particularly simple.
  • better focusing is achieved by arranging the ultrasound emitters on the concave inner wall of the cylinder and because of the longer travel paths of the ultrasound from the ultrasound emitters to the tube inner wall to be measured and the associated smaller travel path differences of the individual ultrasound emitters.
  • the ultrasound emitters can be phase-controlled in such a way that they can be set to a specific focal distance. The focus distance can thus be easily adapted to different pipe inner diameters to be measured.
  • the ultrasound emitters can also be phase-controlled in such a way that a radial sound emission direction of a group of the ultrasound emitters can be selected. Different radial areas of the inner wall of the container can thus be measured with the same group of ultrasound emitters. If only a radial partial area of the inner surface of the hollow cylinder, such as the wall segments, is provided with ultrasonic radiators, the entire tube circumference can be measured in this way with a suitable arrangement of the wall segments without rotating the cylinder.
  • a displacement device for moving the hollow cylinder in the direction of its axis can be specified.
  • the entire inner wall of a tube can be measured in the axial direction.
  • the focusing of the ultrasound emitters in the axial direction of the cylinder or the tube to be measured is thus achieved on the one hand by focusing the individual ultrasound emitters and on the other hand by the axial position of the cylinder with respect to the tube to be measured.
  • the hollow cylinder can also be rotatable about its axis. This is particularly advantageous if the ultrasound radiators are arranged in such a way that the phase control of the
  • the entire circumference of the inner tube wall can be measured.
  • the entire circumference is measured by turning the hollow cylinder.
  • Figure 1 is a schematic representation of an inventive device arranged in a pipe to be measured.
  • FIG. 2 shows a schematic representation of a device according to the invention arranged in a tube, in which the superposition of the sound fields of ultrasonic radiators is shown;
  • FIG. 3 and 4 show a basic illustration of the device from FIG. 2, in which the ultrasound of a group of ultrasound emitters is focused on the inner tube wall;
  • 5a and 5b show a longitudinal section and top view of an embodiment of the device according to the invention.
  • Fig. 6 is a basic perspective view of another embodiment of the device according to the invention.
  • Fig. 7 shows a further embodiment for oblique sound (7a) and vertical sound (7b) according to the lower part of Fig. 5a and
  • FIG. 8 shows a longitudinal section through a basic illustration of a third exemplary embodiment of the device according to the invention.
  • FIG. 1 shows a cross section through a basic arrangement of a device according to the invention.
  • the device 7 is arranged in a tube 1 to be examined and is guided via ball guides 9 in the tube 1 to be examined.
  • Ultrasound emitters 2 are attached to concave wall segments 3, for example glued or screwed or connected by a snug fit, and arranged along a concave surface of the device.
  • the concave surface is formed here by a wall segment 3 which is fastened on the inside of a hollow cylinder 4 with window-like openings 5.
  • These openings or recesses 5 are arranged on the side of the hollow cylinder 4 opposite the ultrasonic radiators 2, so that the ultrasound emitted by the ultrasonic radiators 2 leads to the opposite inner wall of the tube 1 can reach.
  • the hollow cylinder 4 is arranged axisymmetrically to the tube axis 6 of the tube 1.
  • the arrangement of the ultrasound emitter 2 and the wall segments 3 on the inner wall of the hollow cylinder 4 is annular.
  • For a group of five ultrasonic radiators 2 it is shown in the figure that the beam directions of the ultrasonic radiators 2 are directed towards one another due to the concave geometry. It will
  • the ultrasound fields 8 are superimposed by a plurality of ultrasound emitters 2 than in the case of a non-concave arrangement.
  • a higher number of ultrasonic radiators 2 also contribute to the resulting sound field in the tube 1 to be measured. This improves the focus of the ultrasound. As the signal increases, you get a better signal-to-noise ratio and one
  • the excitation of the ultrasound emitters 2 for emitting ultrasound takes place with an excitation device, not shown in the figure, which generates the signals 11.
  • the ultrasound emitters 2 usually have piezoelectric elements, so that the excitation takes place by means of electrical signals.
  • the device according to the invention is usually used to measure irregularities, such as imperfections and changes in wall thickness in pipelines. The entire pipe wall is thus measured for irregularities.
  • a pulse-echo method is expedient, for example, in which the pulses emitted by the ultrasound emitters 2 are reflected on the inner tube wall of the tube 1 and received again by the ultrasound emitters 2 and converted into electrical signals.
  • the electrical output signals of the ultrasound emitter 2 are detected and processed by a detection device, not shown in the figure.
  • the tube 1 is filled with water and the device 7 containing the ultrasound emitter 2, the test system, is arranged by means of the ball guides 9 concentrically to the tube axis 6 and moved accordingly, depending on how the inner wall of the tube 1 is to be measured .
  • FIG. 3 shows the device from FIG. 2.
  • the phase control is selected so that the focus of the group of ultrasound emitters 2 is on or in the opposite inner wall of the tube 1.
  • 4 shows a further possibility of phase control of the same group of ultrasonic radiators 2, in which the focus of the group of ultrasonic radiators 2 is also on the inner wall of the tube 1.
  • the phase shift between the signals exciting the ultrasound emitter 2 and thus between the ultrasound emitted by them is selected such that the focus is axially shifted with respect to the drawing in FIG. 3.
  • FIG. 3 shows the device from FIG. 2.
  • the ultrasound becomes oblique due to the phase control, in FIG. 3 perpendicularly with respect to the axis of symmetry radiated into the tube 1 by the arrangement of the group of ultrasound emitters 2.
  • a radial area at an axial height of the tube 1 can therefore be measured with a group due to the phase control of the ultrasound emitter 2.
  • the arrangement according to the invention of the ultrasound emitters 2 on a concave surface also results in a long path of the ultrasound from the ultrasound emitters to the inner tube wall.
  • this has the advantage that the ultrasound fields of a larger number of ultrasound emitters 2 can be superimposed and thus a sharper focusing can be achieved.
  • the longer travel distance also means that, for a desired phase control, on the basis of which the ultrasound can be irradiated obliquely in the circumferential direction of the tube, smaller phase differences between the ultrasound emitters 2 are required in order to measure a specific radial area of the tube 1 to be examined.
  • the test system 7 can be moved in the direction of the axis 6 of the pipe by a displacement device, not shown.
  • test system can be rotated around the pipe axis 6 in order to measure further radial areas of the pipe 1.
  • the rotation of the test system around the tube axis 6 can also be replaced by a suitable offset arrangement of different groups of ultrasonic radiators 2 and by their phase control, as described above.
  • FIG. 5 shows an embodiment of the device 7 according to the invention in longitudinal section 5a and in section A-A in FIG. 5a in FIG. 5b below.
  • the device 7 or the test system is arranged in the pipe 1 to be examined symmetrically to the pipe axis 6.
  • the hollow cylinder consists of three wall segments 3, which are connected to a base plate 13 and a cover plate 14. Ball guides 9 are attached to these fastening parts.
  • the cover plate is provided with an end piece 1 2.
  • the wall segments 3 are symmetrical to the hollow cylinder axis 6 Stripes formed along a partial circumference of the hollow cylinder.
  • the wall segments 3 are axially offset from one another and connected to one another and fastened in the hollow cylinder 4 with respect to the window-like openings 5. Furthermore, the wall segments 3 are offset such that a wall segment 3 forms the continuation of the previous wall segment 3, and for example the entire hollow cylinder circumference is covered by the three wall segments 3.
  • the ultrasound emitters 2 are arranged in a ring on the wall segments 3.
  • the ultrasound emitters 2 are controlled in groups, as shown in FIGS. 2 to 4, so that their focus is on the inner wall of the tube 1 and the tube 1 can be measured for defects.
  • Appropriate phase control of the ultrasound radiator 2 allows large radial areas of the tube 1 to be measured. Since the wall segments 3 and thus the ultrasound emitters 2 are radially offset from one another, the device 7 can be used to measure the entire circumference of the tube 1 in a specific axial region of the tube 1 by means of a purely axial displacement thereof. Different axial areas of the tube 1 can also be measured by axially displacing the test system.
  • FIG. 6 shows a schematic illustration of a further exemplary embodiment of the device according to the invention.
  • the hollow cylinder-like test system is here also arranged axisymmetrically to the tube axis 6 of the tube 1.
  • the wall of the hollow cylinder 4 is designed here as a spirally arranged band-like strip 10.
  • the spiral spacing or the gradient of the spiral is selected such that a group of ultrasonic radiators 2 arranged on the spiral strip 10 is not opposite a partial area of the band-like strip, so that the ultrasound of these ultrasonic radiators 2 penetrate through the corresponding region of the hollow cylinder 4 and onto the inner wall of the tube 1 can be focused.
  • the ultrasound is focused in the manner described in connection with the above figures.
  • the measurement of defects in the entire tube 1 is also carried out as described in connection with FIG. 5.
  • FIG. 7 shows a schematic representation of a shown another embodiment of the invention for the oblique sound, corresponding to the lower part of Fig. 5a.
  • the inclination of the ultrasound emitter 2 is selected such that the ultrasound fields 8 of the ultrasound emitter 2 run through the upper window opening 5 of the hollow cylinder 4 and are directed obliquely onto the inner wall of the tube 1.
  • the ultrasound radiators 2 are arranged inclined upwards and also shown.
  • the ultrasound radiators 2 can of course also be inclined downward, with openings 5 arranged correspondingly below the ultrasound radiators.
  • a hollow cylinder 4 is arranged as an inspection system in an axisymmetric manner.
  • the ultrasound emitters 2 are arranged inclined downwards. The inclination is chosen such that the ultrasonic fields of the ultrasound emitter 2 pass the lower end of the device 7 and are directed below the hollow cylinder 4 onto the inner wall of the tube 1.
  • the ultrasound emitters 2 can of course also be directed upwards, in which case they are arranged at the upper end of the device 7, so that the ultrasound fields of the ultrasound emitters 2 run past the upper end of the hollow cylinder 4 and meet the inner wall 1 of the container.
  • the ultrasound can be focused on the inner tube wall, where defects can then be detected as described above. Due to the angle of inclination of the ultrasound radiator 2 and the focusing selected by the phase control, the tube can in this case also be arranged with the
  • Ultrasound emitters can be used in a hollow cylinder without interruptions, ie which is not segmented or constructed in a spiral. As above, this results in better focusing due to the longer travel paths of the ultrasound and the associated lower travel path differences of the individual ultrasound emitters 2.
  • This arrangement is for testing direction-oriented errors are suitable.
  • the test system 7 that is to say the hollow cylinder 4
  • Suitable phase control enables focusing in the tube circumferential direction and focusing in the tube axis direction due to the inclination or curvature of the individual ultrasound emitters. It is also possible to combine the arrangement in FIG. 8 with one of the exemplary embodiments shown in FIGS. 5 and 6.
  • the hollow cylinder-like test system 7 is arranged symmetrically to the tube axis 6 in a certain axial region of the tube 1.
  • the ultrasound emitters 2 arranged on the wall segments 3 of the test system are excited in groups to emit ultrasound by means of an excitation device (not shown).
  • the focusing of the ultrasound emitted by a respective group is carried out by suitable phase control of the individual ultrasound emitters 2.
  • the phase control of the individual ultrasound emitters is changed such that with a respective group a desired radial area of the inner wall of the tube 1 is measured for defects can be.
  • the pulses emitted by the ultrasound emitters 2 are reflected back from the inner wall and from errors at a certain depth below the inner wall of the tube and detected by the ultrasound transmitters.
  • the output from the Ultraschalistrahlern basis of these signals, • electrical signals are supplied to a detection means in which the detection and a corresponding evaluation of the data and a determination of the defects is carried out.
  • the measuring process is carried out using a pulse-echo method.
  • the test system within the tube 1 in the axial direction in a further predetermined position is repeated there.
  • the measurement in various axial positions of the tube 1 is carried out until the desired tube area or the entire tube has been measured.

Landscapes

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

Abstract

L'invention concerne un dispositif qui permet de mesurer les irrégularités de parois intérieures de cuves à l'aide d'ultrasons. Ce dispositif comprend des émetteurs d'ultrasons (2), un dispositif d'excitation permettant de stimuler lesdits émetteurs pour qu'ils émettent des ultrasons. Les émetteurs d'ultrasons (2) sont répartis par groupes, de manière à ce que les ultrasons émis par un groupe puissent toujours être focalisés sur la paroi intérieure de la cuve. Le dispositif comprend également un dispositif de détection servant à détecter les ultrasons réfléchis par la paroi intérieure de la cuve. Le pouvoir de détection de défauts de matière que ce dispositif permet d'atteindre est renforcé par le fait que les émetteurs d'ultrasons (2) sont disposés le long d'une surface concave (4) du dispositif.
EP95924924A 1994-06-23 1995-06-23 Dispositif permettant de mesurer les irregularites de parois interieures de cuves, a l'aide d'ultrasons Withdrawn EP0766822A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19944421847 DE4421847C2 (de) 1994-06-23 1994-06-23 Vorrichtung zum Messen von Unregelmäßigkeiten in Behälterinnenwänden mit Ultraschall
DE4421847 1994-06-23
PCT/EP1995/002453 WO1996000387A1 (fr) 1994-06-23 1995-06-23 Dispositif permettant de mesurer les irregularites de parois interieures de cuves, a l'aide d'ultrasons

Publications (1)

Publication Number Publication Date
EP0766822A1 true EP0766822A1 (fr) 1997-04-09

Family

ID=6521230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95924924A Withdrawn EP0766822A1 (fr) 1994-06-23 1995-06-23 Dispositif permettant de mesurer les irregularites de parois interieures de cuves, a l'aide d'ultrasons

Country Status (3)

Country Link
EP (1) EP0766822A1 (fr)
DE (1) DE4421847C2 (fr)
WO (1) WO1996000387A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19617455C2 (de) * 1996-05-02 1998-04-09 Siemens Ag Verfahren zur Ultraschallprüfung eines Werkstückes
TW484139B (en) * 1999-06-18 2002-04-21 Siemens Power Corp Method for the inspection of steam generator tubing utilizing nonaxisymetric guided waves
FR2796153B1 (fr) * 1999-07-09 2001-11-30 Setval Controle non destructif a capteurs ultrasonores repartis
DE10014936C1 (de) * 2000-03-20 2001-10-25 Mannesmann Ag US-Prüfkopfvorrichtung
DE10262232B4 (de) * 2002-01-22 2008-07-03 Pii Pipetronix Gmbh Verfahren und Vorrichtung zum Untersuchen von Rohrleitungen
DE10338063A1 (de) * 2003-08-19 2005-03-17 Daimlerchrysler Ag Verfahren zur Messung der Wandstärke einer in einem Kurbelgehäuse eingegossenen Zylinderlaufbuchse
GB0816804D0 (en) * 2008-09-13 2008-10-22 Offshore Marine Technology Ltd Inspection device
GB201020249D0 (en) * 2010-11-30 2011-01-12 Airbus Uk Ltd Ultrasonic array focussing apparatus and method

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US3417600A (en) * 1966-10-10 1968-12-24 Western Electric Co Wire heading mechanism
FR2298921A5 (fr) * 1973-01-29 1976-08-20 Commissariat Energie Atomique Procede de controle par ultrasons des soudures en forte epaisseur et dispositifs de mise en oeuvr
FR2256617B1 (fr) * 1973-12-26 1980-03-21 Commissariat Energie Atomique
JPS5711648A (en) * 1980-06-27 1982-01-21 Matsushita Electric Ind Co Ltd Ultrasonic probe
FR2670898B1 (fr) * 1990-12-21 1994-05-27 Framatome Sa Dispositif de controle non destructif par ultrasons d'elements de forme allongee a section sensiblement constante.
JP3608582B2 (ja) * 1995-07-07 2005-01-12 ソニー株式会社 画像符号化装置および方法、画像復号装置および方法

Non-Patent Citations (1)

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Title
See references of WO9600387A1 *

Also Published As

Publication number Publication date
DE4421847A1 (de) 1996-01-04
DE4421847C2 (de) 1996-06-27
WO1996000387A1 (fr) 1996-01-04

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