US3348172A - Shear-wave steel ultrasonic delay line - Google Patents

Shear-wave steel ultrasonic delay line Download PDF

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Publication number
US3348172A
US3348172A US465898A US46589865A US3348172A US 3348172 A US3348172 A US 3348172A US 465898 A US465898 A US 465898A US 46589865 A US46589865 A US 46589865A US 3348172 A US3348172 A US 3348172A
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US
United States
Prior art keywords
delay line
zone
shear
ultrasonic delay
steel
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
US465898A
Other languages
English (en)
Inventor
Dubard Louis
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Application granted granted Critical
Publication of US3348172A publication Critical patent/US3348172A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
    • H03H9/133—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials for electromechanical delay lines or filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time

Definitions

  • the present invention relates to ultrasonic delay lines comprising a steel ultrasonic guide, having, for example, a square section, and associated at one end with an electroacoustic transducer which excites in the guide a shear wave and at the other end with another transducer which receives this wave.
  • a drawback of such a delay line is that the signals propagated are damped to a great extent, due to the lack of homogeneity of the steel.
  • an ultrasonic delay line comprising an elongated steel guide having two ends, said steel having a non-homogeneous Zone having a smaller and a greater transverse dimension; and two piezoelectric shear wave transducers respectively coupled to said two ends, having respective parallel transverse vibration axes, perpendicular to said greater transverse dimension.
  • FIG. 1 shows a piezoelectric plate which has been metallized and is subjected to a polarizing field
  • FIG. 2 shows a transducer fixed to the end of a bar according to the invention.
  • FIG. 3 shows in section a portion of a delay line according to the invention.
  • FIG. 1 there is shown a ceramic piezoelectric plate 1, obtained for example by pressing and shown in crosssection. Its surfaces 11 are metallized.
  • Plate 1 is polarized by the application of an electric field 12 perpendicularly to its metallized outer surfaces 11. After polarization, plate 11 is de-metallized and cut into thinner plates whose long axis is parallel to the direction 12 of the polarizing field.
  • transducer l is applied to the end face of the bar in such a manner as to obtain a maximum of coupling with the portion of the end face which is not affected by the non-homogeneity.
  • the vibration axis ll of transducer 13 is directed normally to the longer transverse axis of the non-homogeneous zone.
  • FIG. 3 shows in section one end of a delay line according to the invention.
  • saw cuts 24 have been formed in the end of the bar 2 so as to prevent the reflection of ultrasonic waves at the ends of bar 2 and especially at the zones 21 thereof which are not covered by the transducer.
  • the zone 25 covered by the transducer has a very low reflectivity.
  • An ultrasonic delay line comprising an elongated steel guide having two ends, said steel having a nonhomogeneous zone having a smaller and a greater transverse dimension; two piezoelectric shear wave transducers respectively coupled to said two ends, having respective parallel transverse vibration axes, perpendicular to the greater transversedimension of said zone.
  • An ultrasonic delay line comprising an elongated steel guide having two ends, said steel having a nonhomogeneous zone having a smaller and a greater transverse dimension; two piezoelectric shear Wave transducers respectively coupled to said two ends, having respective parallel transverse vibration axes, perpendicular to the greater transverse dimension of said zone, said guide having a reduced section near each of said ends.
  • An ultrasonic delay line comprising an elongated steel guide having two ends, said steel having a nonhomogeneous zone having a smaller and a greater transverse dimension; two piezoelectric shear wave transducers respectively coupled to said two ends, having respective parallel transverse vibration axes, perpendicular to the greater transverse dimension of said zone, said guide having slots near each of said ends.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Transducers For Ultrasonic Waves (AREA)
US465898A 1964-06-24 1965-06-22 Shear-wave steel ultrasonic delay line Expired - Lifetime US3348172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR979397A FR86016E (fr) 1964-06-24 1964-06-24 Lignes à retard à guide ultra sonore en acier

Publications (1)

Publication Number Publication Date
US3348172A true US3348172A (en) 1967-10-17

Family

ID=8833055

Family Applications (1)

Application Number Title Priority Date Filing Date
US465898A Expired - Lifetime US3348172A (en) 1964-06-24 1965-06-22 Shear-wave steel ultrasonic delay line

Country Status (7)

Country Link
US (1) US3348172A (fr)
CH (1) CH430292A (fr)
DE (1) DE1255826B (fr)
ES (1) ES314543A1 (fr)
FR (1) FR86016E (fr)
GB (1) GB1117466A (fr)
NL (1) NL6508113A (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657319A (en) * 1950-06-15 1953-10-27 Sperry Prod Inc Ultrasonic beam shaping device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
NL6508113A (fr) 1965-12-27
DE1255826B (de) 1967-12-07
FR86016E (fr) 1965-11-26
ES314543A1 (es) 1966-03-01
GB1117466A (en) 1968-06-19
CH430292A (fr) 1967-02-15

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