FR2355575A1 - METHOD AND APPARATUS FOR GENERATING SURFACE SOUND WAVES IN AN ELECTRICALLY CONDUCTING BODY - Google Patents

METHOD AND APPARATUS FOR GENERATING SURFACE SOUND WAVES IN AN ELECTRICALLY CONDUCTING BODY

Info

Publication number
FR2355575A1
FR2355575A1 FR7719220A FR7719220A FR2355575A1 FR 2355575 A1 FR2355575 A1 FR 2355575A1 FR 7719220 A FR7719220 A FR 7719220A FR 7719220 A FR7719220 A FR 7719220A FR 2355575 A1 FR2355575 A1 FR 2355575A1
Authority
FR
France
Prior art keywords
sound waves
surface sound
generating surface
electrically conducting
conducting body
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.)
Granted
Application number
FR7719220A
Other languages
French (fr)
Other versions
FR2355575B1 (en
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.)
TI Group Services Ltd
Original Assignee
TI Group Services Ltd
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 TI Group Services Ltd filed Critical TI Group Services Ltd
Publication of FR2355575A1 publication Critical patent/FR2355575A1/en
Application granted granted Critical
Publication of FR2355575B1 publication Critical patent/FR2355575B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14502—Surface acoustic wave [SAW] transducers for a particular purpose

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé et un appareil de génération d'ondes sonores de surface dans un corps conducteur de l'électricité. Ledit appareil comprend un transducteur constitué par un conducteur placé à proximité de la surface du corps et excité par un courant alternatif de façon à engendrer des ondes sonores de surface dans le corps, qui se propagent perpendiculairement à la longueur du conducteur. Le transducteur comporte plusieurs conducteurs parallèles dans un plan commun parallèle à la surface du corps et occupe une largeur correspondant sensiblement à la moitié ou moins d'une longueur d'ondes dans le sens de propagation, la fréquence du courant alternatif correspondant à la moitié de celle des ondes sonores de surface nécessaires. Application à la génération d'ondes sonores dans un corps conducteur de l'électricité, notamment pour en détecter les défauts.A method and apparatus for generating surface sound waves in an electrically conductive body is disclosed. Said apparatus comprises a transducer consisting of a conductor placed near the surface of the body and excited by an alternating current so as to generate surface sound waves in the body, which propagate perpendicularly to the length of the conductor. The transducer has several parallel conductors in a common plane parallel to the surface of the body and occupies a width corresponding to substantially half or less of a wavelength in the direction of propagation, the frequency of the alternating current corresponding to half of that of the necessary surface sound waves. Application to the generation of sound waves in an electrically conductive body, in particular for detecting faults.

FR7719220A 1976-06-24 1977-06-23 METHOD AND APPARATUS FOR GENERATING SURFACE SOUND WAVES IN AN ELECTRICALLY CONDUCTING BODY Granted FR2355575A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2625476A GB1526565A (en) 1976-06-24 1976-06-24 Ultrasonic transducer

Publications (2)

Publication Number Publication Date
FR2355575A1 true FR2355575A1 (en) 1978-01-20
FR2355575B1 FR2355575B1 (en) 1984-04-13

Family

ID=10240760

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7719220A Granted FR2355575A1 (en) 1976-06-24 1977-06-23 METHOD AND APPARATUS FOR GENERATING SURFACE SOUND WAVES IN AN ELECTRICALLY CONDUCTING BODY

Country Status (9)

Country Link
BE (1) BE855731A (en)
DE (1) DE2727272A1 (en)
DK (1) DK274377A (en)
FR (1) FR2355575A1 (en)
GB (1) GB1526565A (en)
IE (1) IE45000B1 (en)
IT (1) IT1081106B (en)
LU (1) LU77613A1 (en)
NL (1) NL7707067A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19752154B4 (en) * 1997-11-25 2011-05-12 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH Transmission system for ultrasonic waves

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EXBK/71 *
EXBK/75 *
EXBK/77 *

Also Published As

Publication number Publication date
BE855731A (en) 1977-10-17
NL7707067A (en) 1977-12-28
FR2355575B1 (en) 1984-04-13
LU77613A1 (en) 1977-10-03
DE2727272A1 (en) 1978-01-12
DK274377A (en) 1977-12-25
IT1081106B (en) 1985-05-16
IE45000L (en) 1977-12-24
GB1526565A (en) 1978-09-27
IE45000B1 (en) 1982-06-02

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Legal Events

Date Code Title Description
ST Notification of lapse