US3850027A - Immersion ultrasonic inspection system of the whole surface of rolled flat bar - Google Patents

Immersion ultrasonic inspection system of the whole surface of rolled flat bar Download PDF

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Publication number
US3850027A
US3850027A US00337711A US33771173A US3850027A US 3850027 A US3850027 A US 3850027A US 00337711 A US00337711 A US 00337711A US 33771173 A US33771173 A US 33771173A US 3850027 A US3850027 A US 3850027A
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United States
Prior art keywords
flat bar
immersion
probes
inspection system
bar
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Expired - Lifetime
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US00337711A
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English (en)
Inventor
A Nakanishi
H Nakazawa
K Yamashima
T Shiraiwa
H Yamaguchi
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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    • 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
    • G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
    • 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
    • G01N29/223—Supports, positioning or alignment in fixed situation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S73/00—Measuring and testing
    • Y10S73/90—Automatic gain control

Definitions

  • the present invention relates to a system for detecting surface flaws over the whole surface of a flat bar including flat and end portions thereof using surface wave propagation in an immersion ultrasonic inspection method.
  • an object of this invention is to provide an immersion ultrasonic inspection system for automatically and efficiently inspecting the whole surface of the rolled flat bar including the flat and end portions thereof at high accuracy.
  • Another object of this invention is to increase the inspection accuracy by preventing bubbles from attaching to the surface of specimen by spraying water under pressure onto the whole surface of the specimen to forcibly prewet the whole surface immediately before introducing the specimen into immersion tank.
  • a further object of this invention is to increase the inspection accuracy by preventing bubbles from attaching to the ultrasonic transmitting and receiving surface of probes disposed within the immersion tank by spraying water under pressure onto the surface.
  • a still further object of this invention is to provide a probe positioner for freely controlling the distance, angle of inclination, horizontal and vertical positions of the probes disposed within the immersion tank.
  • the immersion ultrasonic inspection system has an inlet table, side guide rollers, pinch rollers, a flaw detector (water tank, probe positioner, etc.), and an outlet table disposed in series on a transfer line of rolled flat bars of, for example, rolled spring steel flat bar, A specimen of the rolled flat bar is introduced into the immersion tank. probes are disposed in both front and back sides of the specimen in inclined relation thereto at respectively different points of incidence within the immersion tank, and a surface wave is applied to the specimen from the probes to detect flaws on the whole surface of the specimen including the flat and end portions thereof.
  • the specimen prewetting means has a set of nozzles inclined from the upper and lower directions at the neighborhood of the specimen inlet of the immersion tank of the flaw detector.
  • the prewetting means prevents bubbles from attaching to the surface of the specimen by spraying water under pressure onto the surface thereof from the nozzles.
  • a tank for receiving water leaking from the nozzles and the immersion tank may be provided so that the received water is returned to the immersion tank by a suitable pump.
  • the bubble removing means of the immersion type probe removes bubble attaching to the ultrasonic transmitting and receiving surface of the probe immersed in the water by spraying water under pressure onto the ultrasonic transmitting and receiving surface of the (immersion type) probe.
  • the probe positioner according to this inventio mgging a set of prob e s spaced apart from and retained opposite'to e'ach other can cqitrgl djstanee between the @bes. vertical and liifiz ontal positions and angles of i iiiiation of the probes.
  • FIG. 1 is a side view showing a schematic construction of the immersion ultrasonic inspection system according to the present invention
  • FIG. 2 is a partial sectional view taken along the line IIII of FIG. 1;
  • FIG. 3 is a schematic constructional view taken along the line IIIIII of FIG. 2;
  • FIGS. 4A-4D are a side view and plan views of the bubble removing means of the probe.
  • FIGS. 5 and 6 are schematic illustrations of the arrangement of the probes
  • FIG. 7 is a side view of the probe positioner
  • FIG. 8 is a graph explaining the energy displacement of surface wave
  • FIG. 9 is a schematic illustration of the inclined disposition of the probe.
  • FIG. 10 is a graph showing the relation between the angle of inclination of the probe and the echo height
  • FIG. 11 is a graph showing the relation between the inspection distance and the attenuation of echo
  • FIG. 12 is a schematic illustration of an arrangement for testing the effect of the shape of the end of specimen on the end echo.
  • FIG. 13 is a graph showing the relation between the shape of the end of specimen and the echo height.
  • FIG. 1 is a side view showing a schematic construction of the immersion ultrasonic inspection system 1 comprising an inlet table 2, a set of pinch rollers 3, a flaw detector 4, and an outlet table 5.
  • a specimen 10 is transferred in the longitudinal direction 11 by transfer rollers 21 and side guide rollers 22 mounted on the inlet table 22 and reaches the first pinch rollers 3, whereat the specimen 10 is controlled in horizontal position by side guide rollers 22 and controlled in vertical position and transferred to the flaw detector 4 to be described.
  • the specimen having passed the flaw detector 4 is received by the second pinch rollers 3 to be controlled in vertical position and then transferred to the succeeding outlet table 5.
  • the specimen is further transferred in the longitudinal direction 1 1 by transfer rollers 51 and side guide rollers 52 mounted on the outlet table 5.
  • the first and second pinch rollers 3 are in the same construction comprising a set of pinch rollers 31 vertically spaced from each other.
  • the specimen 10 passes through the set of pinch rollers.
  • the flaw detector 4 comprises an immersion tank 41, probe positioners 42, probes 43, and receiving rollers 44. As shown in FIGS. 2 and 3, two specimens 10 disposed in parallel are transferred from the first pinch rollers 3 to the flaw detector 4, introduced into the immersion tank 41 through an inlet 411 and transferred out through an outlet 412. In the immersion tank, the specimens 10 are supported by the receiving rollers 44 and immersed within the water, and are disposed, as shown in FIGS. 2 and 3, so as to be detected from the upper and lower directions by a plurality of probes 43 which are, as detailedly described hereinbelow, adjustably mounted to the probe positioners 42.
  • the affinity (or attachment) of the specimen for water is essential to increase the affinity (or attachment) of the specimen for water by, for example, forcibly prewetting the whole surface of the specimen by spraying water under pressure onto the specimen before introducing the specimen into the immersion tank. Prewetting prevents the formation of an air layer between the surface of the specimen and water, attachment of air bubbles or other materials to the surface of the specimen and leakage of water of the tank through the specimen inlet of the tank.
  • nozzles 45 are provided at the entrance side of the inlet 411 of the immersion tank 41 for spraying water under pressure toward said inlet 411 from the upper and lower directions.
  • the water sprayed by the nozzles 45 wets both upper and lower sides of the specimen 10 when entering the immersion tank 41 after passing through the first pinch rollers 3, while cleaning the dusts on the surface of the specimen away with its pressure. Accordingly, when the specimen 10 is introduced into the immersion tank 41, the surface of the specimen 10 has the affinity for the water of the immersion tank and, therefore, is free from the attachment of air bubbles.
  • the water under pressure sprayed from the nozzles 45 prevents leakage of water from the inlet 411 of the immersion tank 41.
  • the pressure of water about 3 5 Kg/cm is sufficient for thefunction of the nozzles 45.
  • a portion of the sprayed water is transferred together with the specimen 10 into the immersion tank 41.
  • the rest of the water is, received by a tank 46 provided below the immersion tank 41, and is recirculated by a circulating pump 47 into the immersion tank 41 together with the water overflowed from the tank 41.
  • a ring-shaped nozzle pipe 432 is provided at the position opposite to and somewhat spaced from the ultrasonic transmitting and receiving surface 431 of the probe 43, as shown in FIG. 4A.
  • the ring formed at the leading end of the nozzle pipe 432 has a diameter somewhat larger than the outer diameter of the probe body 43 as shown in FIG. 4B, and is connected and supported at several points to a fixture 434 by supports 433 so that the center of the probe 43 is coaxial with the center of the ring formed by the nozzle pipe 432.
  • a number of orifices 435 so that, during injection, water under pressure injected from the orifices 435 is uniformly applied to the ultrasonic transmitting and receiving surface 431 of the probe 43 disposed above the ring. Even when the probe 43 i s op- Hating .transm. t;t iqjsssive-t e t t tsomcla st water T152181 a predetermined pressure is continuously injected from the orifices 435 toward the central portion of the transmitting and receiving surface.
  • nozzle pipe 436 in the preferred embodiment of this invention is described to be a copper pipe of diameter about 5 6 mm having injection orifices of diameter about I 1.5 mm, it is to be clearly understood that the nozzle pipe of this invention is not limited thereto or thereby.
  • the nozzle pipe of this invention is not limited also in shape to the ring as shown in FIG. 48. But it can be formed in semi-circle configuration as shown in FIGS. 4C and 4D or in any polygonshape as desired. In any of such shapes other than the ring, the effect similar to that of said embodiment can be achieved by applying water under pressure injected from the nozzle uniformly onto the ultrasonic transmitting and receiving surface of the immersion type probe.
  • the inspection system according to the present invention employs immersion ultrasonic inspection system, it is preferable to dispose the probes as shown in FIGS. 5 and 6 considering the attenuation of surface wave with distance within water. Namely, a plurality of probes (three probes in this embodiment) are disposed on the both front and back sides of the specimen 10 in inclined relation to the vertical direction by a predetermined angle 0i as described in detail hereinbelow so that the full width of the specimen 10 can be covered by the probes.
  • a probe 43a for inspecting the front side and a probe 43b for inspecting the back side are attached respectively to support arms 421a and 421! spaced vertically from each other.
  • the position of probes 43a and 43b are controlled in angle with respect to the vertical direction respectively by handles 422a and 422b, in vertical space therebetween by a handle 423, and in horizontal position, namely the position in widthwise direction of the specimen by an handle 424. It is preferable that the control of these angle of inclination. length of space, and vertical and horizontal positions is indicated in suitable scales. More detailed description of the probe positioner will be unnecessary to the skilled in the art in working this invention.
  • FIG. 6 there are shown three stages (No. 1, No. 2, and No. 3) of the probe positioners 42 disposed along the advancing direction of the specimen 10.
  • the inventors experimentally obtained the relation between the angle of incidence of ultrasonic wave and the echo height in the arrangement and dimension shown in FIG. 9 using lead zirconate vibrator of frequency 2.25 MHz having the diameter of 19 mm.
  • the probe 43 is inclined with respect to the vertical direction by the variable angle 61', the distance between the ultrasonic transmitting and receiving surface 431 of the probe 43 and the point of incidence 12 on the surface of the specimen 10 is fixed to 50 mm, the distance between the point of incidence l2 and the surface flaw 13 of the specimen 10 is determined as 50 mm, and the distance between the surface flaw I3 and the end portion of the specimen 10 is determined as mm.
  • the surface flaw 13 was made artificially by electrodischarge machining to the depth of0.5 mm on the flat portion of the specimen.
  • FIGS. 10 and 11 The results of the experiment are shown in FIGS. 10 and 11. As obvious from FIG. 10, the detection accuracy is highest (or attenuation of echo is smallest) when the angle of incidence is about 30 and it corresponds well to the calculated value 307 (30.11). The angle at which reflection echo (noise echo) from the end portion is difficult to emit is 2936 (296), a little acuter than the theoretical angle of incidence 30? (30.1 1). The attenuation of echo by a V notch 13 (see HG. 9)
  • FIG. 13 shows the results of examination of the effect of the end reflected echo, namely using specimens having different end shapes (R finish and angle finish).
  • R finish and angle finish As seen from FIG. 13, the reflection is largest when the angle finish in 90, and with R finish the surface wave propagates along the curvature and there is little reflection from the R portion. It is interesting to find that practical spring steel flat bars having the rolled R finish end and the angle finish end of show almost the same reflection.
  • the inspection result detecting circuit to be connected to the probe may-be a known ultrasonic inspection circuit comprising a synchronous controller, a horizontal axis sweep. a pulse generator, a receiving amplifier, a cathode-ray tube, and a source of power. The results of detection are displayed on the cathode ray tube or automatically recorded on for example a pen-writing oscillograph for observation.
  • An electric pulse synchronously controlled by the source frequency or any specific frequency is applied to the probe and converted into an ultrasonic pulse by an electrostriction vibrator of the probe, and the surface wave is made incident as an ultrasonic wave on the surface of the specimen.
  • the surface wave propagating on the surface of the specimen reaches a defect such as a flaw, it is reflected at that point and received by the probe, converted back into an electric pulse, amplified at the receiver, detected, indicated on the sweep trace of the cathode-ray tube, whereby the size of the flaw.is det e c ted. Since the attenuation of the surface wave is heavily influenced by the quality of the surface finish, flaw detection can be made easier by finishing the surface of the specimen well.
  • the detection circuit of the inspection system includes a distance compensation circuit and a level automatic control circui t for regulating the attenuation of the ultrasonic 5 wave to uniformly evaluatethgflayvs detected at various portions of the specimen.
  • a delay circuit coupled with a marking device may be provided for automatically marking the flaw after the water is removed from the inspected specimen.
  • an artificial flaw of 0.3 mm depth is made at the end portion.
  • the inspection sensitivity of the system is established so that the echo height of the artificial flaw is 35 mm on the cathode-ray tube and continuous inspection is ren dered at this sensitivity.
  • the inspection system can clearly detect natural flaws of 0.1 1 mm 0.23 mm depth on the flat portion and artificial flaws of 0.08 mm 0.44 mm depth on the end portion.
  • Other smaller flaws such as lap and scratch of, for example, 50 u depth can be detected by increasing the inspection sensitivity.
  • Table I shows the results of the practical flaw detection at the sensitivity described above.
  • the automatic surface flaw detection system of rolled steel bar according to the present invention has been used for'inspecting flat bars having the dimension 50 120 mm width X mm thickness X 4,000
  • the system can continuously inspect two sheets of flat bars 6,000 mm long in eight seconds.
  • the present invention since the prewetting means of high power is 'provided prior to the partial immersion tank to increase the attachment of water to the rolled flat bar and simultaneously to cool it effectively, the present invention has an advantage that the specimens immediately after hot rolling can be continuously inspected in satisfactory condition without generating air bubbles or steam if only the surface temperature is not higher than 80C without the necessity of waiting until the specimen is completely cooled.
  • An immersion ultrasonic inspection system which comprises in combination:
  • liquid medium projecting means disposed for projecting liquid to said inlet for prewetting a flat bar passing therein;
  • An immersion ultrasonic inspection system of the whole surface of rolled flat bar characterized in that the flat bar transferring means is provided with a set of pinch rollers adjustably mounted thereon vertically spaced apart from each other and functions to control the vertical position of the flat bar transferred and introduce the flat bar properly into the immersion tank.
  • An immersion ultrasonic inspection system of the whole surface of rolled flat bar characterized in that the flat bar transferring means is provided with an inlet table and an outlet table, on said tables being disposed transfer rollers and side guide rollers with suitable distance therebetween for transferring a plurality of flat bars in parallel to each other simultaneously.
  • An immersion ultrasonic inspection system of the whole surface of rolled flat bar further comprising:
  • a pressure-regulatable feed-water system for feeding water under pressure continuously to the nozzles.
  • An immersion ultrasonic inspection system of the whole surface of rolled flat bar further comprising a ring-shaped nozzle mounted around each probe, said nozzle having a number of injection orifices arranged so that the water under pressure injected from the orifices is focused uniformly onto the ultrasonic transmitting and receiving surface of the immersion probe, and said nozzle being continuously supplied with water under pressure from the pressure-regulatable feed-water system.

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  • Life Sciences & Earth Sciences (AREA)
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US00337711A 1972-03-09 1973-03-02 Immersion ultrasonic inspection system of the whole surface of rolled flat bar Expired - Lifetime US3850027A (en)

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910104A (en) * 1973-09-07 1975-10-07 British Steel Corp Apparatus and method for ultrasonic testing
FR2295422A1 (fr) * 1974-12-19 1976-07-16 Mannesmann Roehren Werke Ag Procede de controle par les ultrasons de la soudure de tubes soudes de grand diametre
FR2353853A2 (fr) * 1976-06-03 1977-12-30 Mannesmann Ag Installation pour le reglage continu de l'angle de propagation d'ultrasons pour l'examen de tuyaux
US4305297A (en) * 1978-08-11 1981-12-15 Mannesmann Aktiengesellschaft Ultrasonic testing of weld seams of pipes for detecting transversely extending defects
US4375167A (en) * 1981-05-18 1983-03-01 Bethlehem Steel Corporation Ultrasonic transducer suspension system for on-line high speed ultrasonic inspection of flat rolled products
US4594897A (en) * 1984-01-27 1986-06-17 Bethlehem Steel Corporation Inspection of the internal portion of objects using ultrasonics
US4677599A (en) * 1984-06-20 1987-06-30 Nissan Motor Company, Limited Ultra-sonic distance measuring apparatus and method
US4686626A (en) * 1983-09-17 1987-08-11 Nissan Motor Company, Ltd. Pitching-suppressive control system and method for an automotive vehicle suspension
US4770438A (en) * 1984-01-20 1988-09-13 Nissan Motor Co., Ltd. Automotive suspension control system with road-condition-dependent damping characteristics
US4796911A (en) * 1983-09-09 1989-01-10 Nissan Motor Company, Ltd. Automotive suspension system with roll-stabilizer having road condition-dependent torsion modulus, and control of torsional modules
US4827416A (en) * 1985-09-13 1989-05-02 Nissan Motor Company, Limited Method and system for controlling automotive suspension system, particularly for controlling suspension characteristics in accordance with road surface conditions
US5684252A (en) * 1996-07-15 1997-11-04 Sonoscan, Inc. Method and apparatus for ultrasonic inspection of electronic components
RU2140629C1 (ru) * 1997-08-07 1999-10-27 Общество с ограниченной ответственностью "РИСОН" Устройство для ультразвуковой дефектоскопии листового проката
FR2806162A1 (fr) * 2000-03-09 2001-09-14 Snecma Moteurs Procede de controle ultrasonore par adaptation d'impedance acoustique
US6357136B1 (en) * 2000-10-12 2002-03-19 Sonoscan, Inc. Scanning acoustic microscope system and method for handling small parts
US20040011133A1 (en) * 2002-07-16 2004-01-22 Busch Ralph E. Ultrasonic test chamber for tray production system and the like
US6739188B1 (en) * 2000-10-24 2004-05-25 Agfa Ndt Gmbh Testing device for the ultrasonic inspection of barstock
US6769957B2 (en) * 2001-06-29 2004-08-03 Innerspec Technologies, Inc. Creeping wave technique for mill roll inspection
US20040173024A1 (en) * 2003-02-19 2004-09-09 Mckeon James C. P. Method and apparatus for temperature-controlled ultrasonic inspection
US20040200284A1 (en) * 2003-04-10 2004-10-14 Lawrence Kessier Tray-fed scanning acoustic microscope system and method for immobilizing parts during inspection
US20040206180A1 (en) * 2002-07-16 2004-10-21 Busch Ralph E. Pulse echo ultrasonic test chamber for tray production system
US20050026452A1 (en) * 2003-07-31 2005-02-03 Won-Jun Lee Etching method for manufacturing semiconductor device
US20050257617A1 (en) * 2004-05-24 2005-11-24 Busch Ralph E Method and apparatus for ultrasonic scanning of a fabrication wafer
RU2266533C1 (ru) * 2004-03-23 2005-12-20 Государственное образовательное учреждение высшего профессионального образования "Самарский государственный архитектурно-строительный университет Способ ультразвукового контроля структуры листового стекла
DE19931350B4 (de) * 1999-06-21 2009-01-02 Krautkrämer GmbH & Co Prüfvorrichtung für die Ultraschallprüfung von Stangenmaterial
US7917317B2 (en) 2006-07-07 2011-03-29 Sonix, Inc. Ultrasonic inspection using acoustic modeling
CN103472131A (zh) * 2013-09-25 2013-12-25 徐州工程学院 冷拔钢管轴向残余应力检测设备
US8689984B2 (en) 2010-11-24 2014-04-08 Exactration, Llc Mixture separation device with detached free rolling bars
WO2014153669A1 (en) 2013-03-28 2014-10-02 Atomic Energy Of Canada Limited Passive bubble minimization in ultrasonic testing
US20140345383A1 (en) * 2013-05-22 2014-11-27 Shenzhen China Star Optoelectronics Technology Co., Ltd. Device and method for testing the quality of a display substrate
US20140352419A1 (en) * 2011-12-15 2014-12-04 Bridgestone Corporation Tread thickness measuring method
CN104597123A (zh) * 2013-10-30 2015-05-06 宝山钢铁股份有限公司 一种钢管水浸法超声波探伤装置及其检测台盆

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JPS5316683A (en) * 1976-07-29 1978-02-15 Nippon Kokan Kk Ultrasonic flaw detecting method and apparatus for inspecting steel plate from behind
JPS5526486A (en) * 1978-05-25 1980-02-25 Huntington Alloys Method and apparatus for disk type material ultrasonic test
GB2139757A (en) * 1983-05-12 1984-11-14 Secr Defence Method of ultrasonic non-destructive testing
US5016475A (en) * 1989-09-20 1991-05-21 Kabushiki Kaisha Kobe Seiko Sho Wiredrawing apparatus including an ultrasonic flaw detector
CN111595274B (zh) * 2019-02-21 2022-03-18 宝山钢铁股份有限公司 快速探测型钢轧辊v型槽底部全周向裂纹深度的测试装置及测试方法

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Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910104A (en) * 1973-09-07 1975-10-07 British Steel Corp Apparatus and method for ultrasonic testing
FR2295422A1 (fr) * 1974-12-19 1976-07-16 Mannesmann Roehren Werke Ag Procede de controle par les ultrasons de la soudure de tubes soudes de grand diametre
US4131026A (en) * 1974-12-19 1978-12-26 Mannesmannrohren-Werke Ag Ultrasonic testing of seams
FR2353853A2 (fr) * 1976-06-03 1977-12-30 Mannesmann Ag Installation pour le reglage continu de l'angle de propagation d'ultrasons pour l'examen de tuyaux
US4305297A (en) * 1978-08-11 1981-12-15 Mannesmann Aktiengesellschaft Ultrasonic testing of weld seams of pipes for detecting transversely extending defects
US4375167A (en) * 1981-05-18 1983-03-01 Bethlehem Steel Corporation Ultrasonic transducer suspension system for on-line high speed ultrasonic inspection of flat rolled products
US4796911A (en) * 1983-09-09 1989-01-10 Nissan Motor Company, Ltd. Automotive suspension system with roll-stabilizer having road condition-dependent torsion modulus, and control of torsional modules
US4686626A (en) * 1983-09-17 1987-08-11 Nissan Motor Company, Ltd. Pitching-suppressive control system and method for an automotive vehicle suspension
US4770438A (en) * 1984-01-20 1988-09-13 Nissan Motor Co., Ltd. Automotive suspension control system with road-condition-dependent damping characteristics
US4594897A (en) * 1984-01-27 1986-06-17 Bethlehem Steel Corporation Inspection of the internal portion of objects using ultrasonics
US4677599A (en) * 1984-06-20 1987-06-30 Nissan Motor Company, Limited Ultra-sonic distance measuring apparatus and method
US4827416A (en) * 1985-09-13 1989-05-02 Nissan Motor Company, Limited Method and system for controlling automotive suspension system, particularly for controlling suspension characteristics in accordance with road surface conditions
US5684252A (en) * 1996-07-15 1997-11-04 Sonoscan, Inc. Method and apparatus for ultrasonic inspection of electronic components
RU2140629C1 (ru) * 1997-08-07 1999-10-27 Общество с ограниченной ответственностью "РИСОН" Устройство для ультразвуковой дефектоскопии листового проката
DE19931350B4 (de) * 1999-06-21 2009-01-02 Krautkrämer GmbH & Co Prüfvorrichtung für die Ultraschallprüfung von Stangenmaterial
FR2806162A1 (fr) * 2000-03-09 2001-09-14 Snecma Moteurs Procede de controle ultrasonore par adaptation d'impedance acoustique
US6357136B1 (en) * 2000-10-12 2002-03-19 Sonoscan, Inc. Scanning acoustic microscope system and method for handling small parts
WO2002031421A1 (en) * 2000-10-12 2002-04-18 Sonoscan, Inc. Scanning acoustic microscope system and method for handling small parts
US6739188B1 (en) * 2000-10-24 2004-05-25 Agfa Ndt Gmbh Testing device for the ultrasonic inspection of barstock
US6769957B2 (en) * 2001-06-29 2004-08-03 Innerspec Technologies, Inc. Creeping wave technique for mill roll inspection
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CA992658A (en) 1976-07-06
JPS4892089A (enrdf_load_stackoverflow) 1973-11-29
DE2311938B2 (de) 1976-07-15
DE2311938A1 (de) 1973-10-04
GB1426954A (en) 1976-03-03
JPS5327953B2 (enrdf_load_stackoverflow) 1978-08-11

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