US3680008A - Ultrasonic wave delay device having a trap zone for undesired signal components - Google Patents

Ultrasonic wave delay device having a trap zone for undesired signal components Download PDF

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Publication number
US3680008A
US3680008A US95018A US3680008DA US3680008A US 3680008 A US3680008 A US 3680008A US 95018 A US95018 A US 95018A US 3680008D A US3680008D A US 3680008DA US 3680008 A US3680008 A US 3680008A
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United States
Prior art keywords
ultrasonic wave
signal
components
propagation
solid medium
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Expired - Lifetime
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US95018A
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English (en)
Inventor
Toshiaki Yamamoto
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Victor Company of Japan Ltd
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Victor Company of Japan Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time

Definitions

  • ABSTRACT An ultrasonic wave delay device for delaying an ultrasonic wave signal a predetermined time by propagating the ul- [30] Fm'gn Apphcation mom), Data trasonic wave signal through a solid propagation medium, in
  • This invention relates to ultrasonic wave delay devices, and more particularly it is concerned with an ultrasonic wave delay device which permits effective removal by a simple structure of the unnecessary components from an ultrasonic wave signal propagated through a solid propagation medium.
  • the electro-acoustic transducer element provided in an input end of the device and the acousto-electric transducer element provided in an output end thereof must be compact in size. Reduction in size of the electro-acoustic transducer element results in a reduction in the area of its oscillation surface, and the radiation characteristics of the oscillation surface of a small electro-acoustic transducer element have a directivity such that a supersonic wave signal is not only directed to a predetermined path of propagation for the ultrasonic wave signal (principal ultrasonic wave signal component propagation path) but also transmitted in other directions as well.
  • an ultrasonic wave signal produced by the compact electro-acoustic transducer element moves in other directions than the direction in which it is intended to move through the principal ultrasonic wave signal component propagation path, so that some components of the ultrasonic wave signal (which are unnecessary components of the signal) are transmitted through other paths in the propagation medium than the principal ultrasonic wave signal component path to the acoustoelectric transducer element at the output end of the propagation medium.
  • the unnecessary signal components differ from the principal signal components in the time in which they are delayed in being transmitted through the propagation medium. Thus, it is essential in ultrasonic wave delay devices of the type described that the unnecessary signal components should be eliminated. Many proposals have hitherto been made for solving this problem.
  • This invention is intended to provide a novel ultrasonic wave delay device which obviates the aforementioned disadvantages of devices of the prior art.
  • a principal object of the present invention is to provide an ultrasonic wave delay device which is compact in size, simple in construction, and yet effective to remove unnecessary components from an ultrasonic wave signal.
  • Another object of the invention is to provide an ultrasonic wave delay device in which a solid propagation medium is used for transmitting an ultrasonic wave signal therethrough, and which lends itself to fabrication with ease by means of an ultrasonic processing operation or by using a press.
  • a further object of the invention is to provide an ultrasonic wave delay device in which reflection surfaces for principal components of an ultrasonic wave signal are provided in the interior of an ultrasonic wave signal propagation medium for forming a path of propagation for the principal components of the signal in the propagation medium.
  • Still another object of the invention is to provide an ultrasonic wave delay device effective to remove unnecessary components from an ultrasonic wave signal by employing a multiple reflection process in the fabrication of an ultrasonic wave propagation medium, in which there are provided reflection surfaces for principal components of the signal and reflection surfaces for the unnecessary components thereof in the interior of the propagation medium, such two types of surfaces being arranged in a specific manner for effectively eliminating the unnecessary signal components.
  • a still further object of the invention is to provide an ultrasonic wave delay device in which reflective surfaces for principal components of an ultrasonic wave signal are provided in the interior of an ultrasonic wave propagation medium so as to thereby define a principal signal component propagation zone therein, and in which unnecessary components of the signal are effectively removed in portions of the propagation medium other than the principal signal component propagation zone.
  • Yet a further object of the invention is to provide an ultrasonic wave delay device in which at least one of a plurality of reflection surfaces for principal components of an ultrasonic wave signal provided in the path of propagation for the principal components of the signal is constructed such that its configuration and area are substantially equal to the crosssectional configuration and area of the principal components of the signal incident thereon, whereby unnecessary components of the signal can be removed with increased effectiveness.
  • FIG. I is a view in explanation of the ultrasonic wave delay device incorporating one embodiment of this invention.
  • FIG. 2 is a perspective view of a modification of theembodiment illustrated in FIG. 1;
  • FIG. 3 is a view in explanation of the ultrasonic wave delay device comprising a second embodiment of this invention.
  • FIG. 4 is a view in explanation of the ultrasonic device comprising a third embodiment of this invention.
  • FIG. 5 is a perspective view of a modification of the third embodiment of the invention.
  • FIG. 6 is a view in explanation of one example of means for attaching a transducer element to a propagation medium in the device according to this invention.
  • an electro-acoustic transducer element I l is attached to one portion of an outer wall of a rectangular propagation medium 10 for an ultrasonic wave which is made,
  • an acousto-electric transducer element 12 is attached to the other portion of the outer wall of the propagation medium 10.
  • FIG. 6 shows one example of means for adhering such transducer elements to the propagation medium.
  • silver or other metal 13 is deposited by vaporization in vacuum on a surface of such propagation medium 10 in a case that the propagation medium 10 is made of glass.
  • the transducer element which consists of a transducer 14 sandwiched by electrodes 15 and 16 made of silver or the like and attached to opposite surfaces of the transducer 14, said transducer element being made of lead titanate-zirconate ceramics or crystal and the like.
  • Input terminals 18 for an input electric signal are connected to the electrodes 15 and 16 of the electro-acoustic transducer element 11. and output terminals 19 for an output electric signal, which has been delayed a predetermined time, are conducer element 12 so as to form a path of propagation 20 for principal components of an ultrasonic wave signal therein.
  • Such reflection surfaces are provided by forming a plurality of openings 22, 22, in the interior of the solid medium 10 by ultrasonic processing, pressing, or milling.
  • FIG. 2 shows a modification of the first embodiment of the invention.
  • FIG. 3 shows a second embodiment and FIGS. 4
  • the plurality of reflection surfaces 21, 21, for forming the path of propagation 20 for the principal components of the ultrasonic wave signal in the'solid medium are provided by I forming aplurality of grooves 23,23, in the solid medium by cutting inwardly from outer wallsof the solid medium 10 by the same means of processing as used in the first embodiment.
  • the reflection surfaces 21 have a surface grain size ranging from l0 to 100 p. which may vary depending on the frequency band of a particular ultrasonic wave used.
  • an inputelectric signalsupplied to the input terminal 18 is converted into an ultrasonic wave signal byv the electro-acoustic transducer element 1 l and radiated into the solid medium 10.
  • principal components of the ultrasonic wave signal radiated into the solid medium 10 are subjected to multiple reflection between the reflection surfaces 21, 21, for the principal components of the signal provided in the interior of the solid medium 10, so that they pass through the predetermined path of travel 20 for the principal components of the signal and reach the acousto-electric transducer element 12, where the ultrasonic wave signal is converted into an A electric signal again to provide an output electric signal which ⁇ has been delayed a predetermined time.
  • FIG. 1 there are illustrated sound absorbing members 25 in phantom lines. Such sound absorbing members 25 are illustrated to show that the unnecessary components of the signal deflected from the path of propagation 20 for the principal .signal components and not incident on one of the reflecting surfaces 21 for the principal signal components can be absorbed'by the sound absorbing members 25 when they reach a portion between the principal signal component propagation zone and an outer wall of the solid medium after they have passed through such zone.
  • Any material which is compatible with mechanical impedance of the solid medium and which hm good adhering and shaping properties such as an epoxy resin containing powdered metal, for example, may be used for making such sound absorbing members.
  • lines 20a and 20b represent boundaries of the path of propagation 20 for the principal signal components. Stated differently, they indicate a range of the principal components of the ultrasonic wave signal radiated from the electro-acoustic transducer element 11 into the solid medium 10. Such range corresponds to the width of a beam of the principal signal components and is from 5 to 10 mm in this embodiment, although its values may vary depending on the size of transducer elements used.
  • the lines 20a and 20b may be considered to represent sides of a cylindrical body having its axis at 20 whose transverse sectional configuration (transverse sectional configuration of the beam of principal signal components) may vary depending on the shape and configura tion of an oscillation surface of the electro-acoustic trans ducer element. v s
  • the present invention resides in the provision of one or a plurality of reflection surfacesZl, 21, for
  • the configuration and area of at least one of the reflection surfaces 21, 21, forming the path of propagation 20 for the principal signal components between the'electroacoustic transducer element' 11 and acousto-electric transducer element 12 aremade substantially equal to the crosssectional configuration and area of the beam of principal signal components incident thereon, it is possible to achieve better results in removing the unnecessary signal components.
  • face 21 which is disposed in face to face relation with the electro-acoustic transducer element 11 are preferably made to be substantially equal to 'the cross-sectional configuration and surfaces 21, 21 may be incorporated in the' embodiments shown in FIGS. 3 to 5 as well.
  • the reflection surfaces 26, 26, forthe unnecessary signal components are formed by the openings 22, ,22, .”in the first embodiment shown inFlG. I'and'its modification shown in FIG. 2, and by the grooves 23, 23, in the second and third embodiments shown in FIGS. 3-and 4 respectively and the modification of the third embodiment shown in FIG.
  • the reflection surfaces 26, 26, for the unnecessary signal components are of such size, shape and construction and disposed in positions such that the unnecessary signal components reflected by reflection surfaces 27 in the outer walls of the solid medium shown in FIGS. 3 and 4 are reflected by the particular reflection surfaces 26 facing such reflection surfaces 27 to move in a direction in which the unnecessary signal components are deflected from the principal signal component propagation zone and subjected to multiple reflection between the reflection surfaces 27 in the outer walls of the solid medium and the reflection surfaces 26.
  • an unnecessary signal component trap zone which captures unnecessary signal components expelled from the principal signal component propagation zone to ensure that they never return to the principal signal component propagation zone.
  • the dimensions (external dimensions) of the modification of the first embodiment shown in FIG. 2 are 46 millimeters in transverse width, 40 millimeters in longitudinal width and three millimeters in thickness.
  • the dimensions (external dimensions) of the modification of the third embodiment shown in FIG. 5 are 40 millimeters in transverse width, 45 millimeters in longitudinal width and six millimeters in thickness.
  • the openings 22 and grooves 23 in all the embodiments are about 10 millimeters in length.
  • An ultrasonic wave delay device comprising a solid medium for propagating an ultrasonic wave signal; an electroacoustic transducer element attached to an outer wall of said solid medium for converting an input electric signal into an ultrasonic wave signal; a plurality of reflection surfaces for principal components of the ultrasonic wave for forming a path of propagation for the principal components of the ultrasonic wave signal radiated from said electro-acoustic transducer element into the interior of said solid medium, at least one of said reflection surfaces for the principal components being provided in the interior of said solid medium; an acousto-electric transducer element attached to an outer wall of said solid medium for converting into an output electric signal only the principal components transmitted through the path of propagation; and at least one reflection surface provided in the interior of said solid medium for unnecessary components of the ultrasonic wave signal transmitted in said solid medium through paths other than the path of propagation for the principal components, said reflection surface for the unnecessary components being provided in a portion of said solid medium other than the path of propagation for the principal components and forming an
  • An ultrasonic wave delay device as defined in claim I wherein said at least one of the reflection surfaces for said principal components of said ultrasonic wave signal and said at least one reflection surface for the unnecessary components of said ultrasonic wave signal are provided in said solid medium by forming a groove or grooves in the solid medium by cutting inwardly from outer walls thereof.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Transducers For Ultrasonic Waves (AREA)
US95018A 1969-12-06 1970-12-04 Ultrasonic wave delay device having a trap zone for undesired signal components Expired - Lifetime US3680008A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44098087A JPS5145217B1 (xx) 1969-12-06 1969-12-06

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GB (1) GB1337744A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753164A (en) * 1971-03-30 1973-08-14 Zenith Radio Corp Acoustic surface wave filter
US3794937A (en) * 1972-04-20 1974-02-26 Westinghouse Electric Corp Folded path acoustic delay line and optical processor
US3798577A (en) * 1971-05-14 1974-03-19 Matsushita Electric Ind Co Ltd Ultrasonic delay line
US4166228A (en) * 1978-03-17 1979-08-28 Sperry Rand Corporation Temperature compensated reflective array for surface acoustic wave processing
US5173667A (en) * 1991-02-19 1992-12-22 Ford Motor Company Acoustic wave transmission media delay line having internally disposed absorber channels
US5365770A (en) * 1993-04-05 1994-11-22 Ford Motor Company Ultrasonic wave interferometers

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54102912U (xx) * 1977-12-28 1979-07-20
GB8422282D0 (en) * 1984-09-04 1984-10-10 Atomic Energy Authority Uk Lamb wave guide
JPH03257243A (ja) * 1990-03-05 1991-11-15 Kenji Hiejima 金属折板の可動型支持フレーム及び可動型支持フレームにより支持される金属折板

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263902A (en) * 1938-02-08 1941-11-25 Emi Ltd Delay device for use in transmission of oscillations
GB705080A (en) * 1951-06-06 1954-03-10 Marconi Wireless Telegraph Co Improvements in or relating to ultra-sonic wave absorption apparatus
US2907958A (en) * 1956-09-27 1959-10-06 Westinghouse Electric Corp Signal delay means
US2922966A (en) * 1953-11-30 1960-01-26 Marconi Wireless Telegraph Co Ultrasonic delay devices
US3400341A (en) * 1963-12-24 1968-09-03 Bell Telephone Labor Inc Elastic dispersive delay line
US3593213A (en) * 1966-12-28 1971-07-13 Philips Corp Ultrasonic delay line and method of manufacturing an ultrasonic delay line

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263902A (en) * 1938-02-08 1941-11-25 Emi Ltd Delay device for use in transmission of oscillations
GB705080A (en) * 1951-06-06 1954-03-10 Marconi Wireless Telegraph Co Improvements in or relating to ultra-sonic wave absorption apparatus
US2922966A (en) * 1953-11-30 1960-01-26 Marconi Wireless Telegraph Co Ultrasonic delay devices
US2907958A (en) * 1956-09-27 1959-10-06 Westinghouse Electric Corp Signal delay means
US3400341A (en) * 1963-12-24 1968-09-03 Bell Telephone Labor Inc Elastic dispersive delay line
US3593213A (en) * 1966-12-28 1971-07-13 Philips Corp Ultrasonic delay line and method of manufacturing an ultrasonic delay line

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753164A (en) * 1971-03-30 1973-08-14 Zenith Radio Corp Acoustic surface wave filter
US3798577A (en) * 1971-05-14 1974-03-19 Matsushita Electric Ind Co Ltd Ultrasonic delay line
US3794937A (en) * 1972-04-20 1974-02-26 Westinghouse Electric Corp Folded path acoustic delay line and optical processor
US4166228A (en) * 1978-03-17 1979-08-28 Sperry Rand Corporation Temperature compensated reflective array for surface acoustic wave processing
US5173667A (en) * 1991-02-19 1992-12-22 Ford Motor Company Acoustic wave transmission media delay line having internally disposed absorber channels
US5365770A (en) * 1993-04-05 1994-11-22 Ford Motor Company Ultrasonic wave interferometers

Also Published As

Publication number Publication date
GB1337744A (en) 1973-11-21
DE2061641B2 (de) 1972-07-13
JPS5145217B1 (xx) 1976-12-02
DE2061641A1 (de) 1971-06-16

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