EP0223038B1 - Tête de sondage pour examen ultrasonique - Google Patents

Tête de sondage pour examen ultrasonique Download PDF

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Publication number
EP0223038B1
EP0223038B1 EP86113804A EP86113804A EP0223038B1 EP 0223038 B1 EP0223038 B1 EP 0223038B1 EP 86113804 A EP86113804 A EP 86113804A EP 86113804 A EP86113804 A EP 86113804A EP 0223038 B1 EP0223038 B1 EP 0223038B1
Authority
EP
European Patent Office
Prior art keywords
test head
vibrator
receiver
transmitter
segments
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.)
Expired - Lifetime
Application number
EP86113804A
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German (de)
English (en)
Other versions
EP0223038A1 (fr
Inventor
Rudi Schmid
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0223038A1 publication Critical patent/EP0223038A1/fr
Application granted granted Critical
Publication of EP0223038B1 publication Critical patent/EP0223038B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B06B1/0607—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 multiple elements
    • B06B1/0622—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 multiple elements on one surface

Definitions

  • the invention relates to a test head for ultrasonic testing in ⁇ technology with a transmitter and a receiver, each comprising a piezoelectric vibrator on a transducer carrier, the transmitter and receiver being structurally combined so that their radiation directions are at least approximately at right angles to a test specimen surface and under a point Angles to it.
  • the invention is based on the task of simplifying work with the ⁇ technology. In other words, the above-mentioned inconvenience should be eliminated.
  • the transducer carrier of the transmitter or of the receiver has a plurality of transducer segments which can be individually controlled via switching elements, and that the transducer carriers are enclosed in a common housing.
  • the invention thus combines in a stable housing which is suitable for easy handling: 1.
  • a vertical test head which can also have an inclination of up to 20 ° and is preferably used as a transmitter, and 2.
  • an angle test head which is equipped with several segmented transducers and is preferably used as a receiver.
  • the vertical test head part with a large-area transducer delivers an intensive sound field with a high excitation amplitude or sensitivity directly below the test head.
  • the more strip-shaped oscillators of the angle test head part simultaneously generate a quite divergent sound field for a wide sensitivity or excitation depth zone.
  • the segmented oscillators of the angle test head can be activated separately or together by switching elements, preferably by switches, which are located on the test head housing. This allows the sensitivity range of the test head to be varied. One thus obtains a test head for several depth zones, which largely eliminates the tediousness mentioned in the book mentioned, since the new test head no longer needs to be moved for depth adjustment.
  • the oscillator segments can be applied in a simple manner on a usually wedge-shaped oscillator carrier, so that they have the same radiation angle with respect to the vertical test head part.
  • different insonification angles can also be used, so that greater depths can be achieved even with a relatively small test head, as will be described in more detail later.
  • all elements can be provided with the same lead distance in order to influence the runtime dynamics of the test head. This is done in a known manner by a step-like design of the vibrating support.
  • the common housing gives the test head according to the invention a stable design, so that the sensitive transducers are well protected.
  • the common housing can also accommodate the switches for the oscillator segments and have lateral sockets for connecting measuring lines.
  • the test head shown schematically in FIG. 1, in particular without a housing, comprises a vertical test head part 1, which is also referred to as a zero degree transducer, and an angle test head part 2.
  • the vertical test head part 1 comprises a vibrating support 4 and a piezoelectric vibrator 5.
  • the angular test head part 2 has a wedge-shaped part Schwingerlini 7 with a segmented into four parts 8, 9, 10 and 11 Schwinger 12. Between the Test head parts 1 and 2, a layer of damping material 14 is provided, which serves the acoustic separation between the transmitter and receiver.
  • the vertical test head part 1 delivers a longitudinal wave sound beam, the central beam 15 of which runs at right angles to the surface of the test specimen, not shown.
  • the longitudinal or transverse sound bundles resulting from the oscillator segments 8 to 11 intersect with the sound bundle of the vertical test head part 1, so that central beam paths according to 18, 19, 20 and 21 are set.
  • the transmitted beam strikes flat reflectors, such as those represented by crack tips, binding errors, etc., cylinder waves are excited, which are then selectively received with the receiver segments depending on the depth of the reflector.
  • the central beam 15 can also run somewhat inclined, namely to such an extent (up to 20 °) that the weld seam is not passed through.
  • Central beam 15 and beam paths 18 to 21 are inclined to the same side.
  • the depth focusing listed in Table 2 can be carried out.
  • the eight focus areas designated there with the capital letters A to H are obtained by making the four oscillator segments 8 to 11 effective according to the table.
  • the effectiveness is represented by a cross, the ineffectiveness by a circle.
  • the focus curves shown in FIGS. 3 and 4 result depending on the segment excitation.
  • the diagrams show the reflector depth position T in millimeters on the abscissa and the specific sensitivity E in dB on the ordinate, the sensitivity for the curves B to H being related to the sensitivity of the focus area A.
  • the new test head enables systematic focusing that increases the depth sensitivity range of the test head.
  • a special feature of the test head shown in FIG. 5 is that the oscillator carrier 7 ⁇ forms a step-shaped surface in the region of the oscillator 12 ⁇ . Therefore, the vibrating segments 8 ⁇ to 11 ⁇ are offset from each other. They have the same insonification angles and their lead lengths 25 given by the oscillator body 7 'are of the same length.
  • the surface 26 of the vibrating body 7 "carrying the vibrator 12" is curved upwards in steps.
  • the central beam paths 18 "to 21" have therefore e.g. every 5 ° between 30 ° and 45 ° diverging insonification angles. This has the consequence that the "interfaces" with the beam 15 "are pulled further apart.
  • test head shows that the plastic, e.g. Polyacrylate, existing transducer carriers 4 and 7 are glued to one another via a 2 mm thick cork plate 14, which projects beyond the 8 mm height of the transducer carriers.
  • parts 4, 7 and 14 form the flat underside in a metal housing 30, the inside 31 of which is provided with a 1 mm thick cork lining 32.
  • the housing 30 is made of 1.5 mm thick stainless steel and has a rectangular shape. The depth, which cannot be seen from the figure, is approximately half the width of the housing, which is 30 mm.
  • a fourfold on-off switch 35 is attached to the metal housing 30, the contacts 36 of which are actuated individually via buttons 37 that come from the top of the housing 30 protrude.
  • two sockets 39 and 40 are seated in the wall of the housing 30. Socket 39 is connected to the oscillator 5 of the vertical test head part 1.
  • the oscillating segments 8 to 11 of the angle test head part 2 are guided to the socket 40 via the switch 35, so that the segments 8 to 11 can be made effective individually or in combination.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Claims (5)

1. Palpeur pour l'examen ultrasonore dans la tech­nique △, avec un émetteur et un récepteur dont chacun compor­te, sur un support d'oscillateur, un oscillateur piézoélec­trique, du type dans lequel l'émetteur et le récepteur sont, du point de vue de la construction, assemblés de telle façon que leurs directions de rayonnement s'étendent à peu près perpendiculairement par rapport à la surface d'un échantillon et sous un angle aigu à celle-ci, caractérisé par le fait que le support d'oscillateur (4) de l'émetteur (1) ou du récep­teur (2) comporte plusieurs segments-oscillateurs (8-11) qui sont susceptibles d'être attaqués individuellement par des éléments de commutation (35), et que les supports des oscil­lateurs (4, 7) sont enfermés dans un boîtier commun (30).
2. Palpeur selon la revendication 1, caractérisé par le fait que les segments-oscillateurs (8ʹ-11ʹ) de l'émet­teur ou du récepteur, présentent des chemins de parcours initiaux (25) identiques (figure 5).
3. Palpeur selon la revendication 1 ou 2, caracté­risé par le fait que les segments-oscillateurs (8ʺ-11ʺ) de l'émetteur ou du récepteur présentent des angles d'irradia­tions différents.
4. Palpeur selon la revendication 1, 2 ou 3, carac­ térisé par le fait que le boîtier commun (30) reçoit les élé­ments de commutation (35).
5. Palpeur selon l'une des revendications 1 à 4, caractérisé par le fait que le boîtier commun (30) comporte des douilles latérales (39, 40) pour le raccordement de conducteurs de mesure.
EP86113804A 1985-10-17 1986-10-06 Tête de sondage pour examen ultrasonique Expired - Lifetime EP0223038B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3537062 1985-10-17
DE3537062 1985-10-17

Publications (2)

Publication Number Publication Date
EP0223038A1 EP0223038A1 (fr) 1987-05-27
EP0223038B1 true EP0223038B1 (fr) 1991-01-02

Family

ID=6283826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113804A Expired - Lifetime EP0223038B1 (fr) 1985-10-17 1986-10-06 Tête de sondage pour examen ultrasonique

Country Status (2)

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EP (1) EP0223038B1 (fr)
DE (1) DE3676448D1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL174585C (nl) * 1978-08-04 1984-07-02 Roentgen Tech Dienst Bv Elektro-akoestische vierkristaltaster en werkwijze voor de toepassing hiervan.
CA1118882A (fr) * 1979-05-07 1982-02-23 Jiri Vrba Sonde aux ultrasons
DE3048188A1 (de) * 1980-12-19 1982-07-29 Siemens AG, 1000 Berlin und 8000 München "ultraschallpruefkopf"

Also Published As

Publication number Publication date
DE3676448D1 (de) 1991-02-07
EP0223038A1 (fr) 1987-05-27

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