US3611200A - Ultrasonic delay line - Google Patents

Ultrasonic delay line Download PDF

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Publication number
US3611200A
US3611200A US872913A US3611200DA US3611200A US 3611200 A US3611200 A US 3611200A US 872913 A US872913 A US 872913A US 3611200D A US3611200D A US 3611200DA US 3611200 A US3611200 A US 3611200A
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US
United States
Prior art keywords
wave energy
boundary surfaces
ultrasonic
energy
contact
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
US872913A
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English (en)
Inventor
Theodorus Bartholo Sliepenbeek
Manfred Franz Karl Gammel
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3611200A publication Critical patent/US3611200A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 elements; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/36—Time-delay networks with non-adjustable delay time

Definitions

  • the body thickness is less than five times the wavelength of the wave energy.
  • the transducers are polarized parallel to both the boundary surfaces and the first and second contact surfaces. Parts of the aforesaid boundary surfaces outside of the desired energy propagation path are arranged to attenuate wave energy impinging thereon.
  • the present invention relates to an ultrasonic delay line comprising a solid body on which are provided one or more transducers for converting electrical energy into ultrasonic mechanical vibration energy, and vice versa, part of the body outside of the desired propagation path of the ultrasonic wave being designed as areas of attenuation for this wave.
  • the material of the body is glass or another substance of slight temperature dependence so that the time interval between the reception of an electric input signal and the transmission of a corresponding electric output signal, during which time interval the input signal is converted into a mechanical vibration which in turn is reconverted into an electric signal, is virtually independent of the temperature.
  • the solid body is made comparatively thick in order to ensure that it has sufficient mechanical strength and to enable the contact surfaces for the provision of the transducers to be of sufficient size.
  • this method of manufacturing ultrasonic delay lines permits of cheap large-scale manufacture, for which, however, several additional conditions have to be satisfied.
  • the invention is characterized in that the body has a thickness which is less than five times the wavelength of the mechanical vibration, that the transducers are polarized in a direction parallel to the boundary surfaces of the body which extend at right angles to the direction of thickness, and in a direction parallel to their surfaces of contact with the solid, which surfaces are at right angles to the said boundary surfaces, and that suitably selected portions of these boundary surfaces which consequently extend substantially parallel to the direction of propagation of the ultrasonic wave propagating through the body, are designed as the said areas of attenuation for this wave.
  • the invention is based on the discovery that by described choice of the direction of polarization of the transducers, the said boundary surfaces act as mirrors for the ultrasonic vibration and hence give rise to comparatively little damping.
  • the ultrasonic wave may follow various undesirable paths so that no exactly defined delay time is obtained. It is known to provide damping material at the undesirable reflecting faces for the ultrasonic wave outside the desired path of this wave so that the wave is constrained within the desired path.
  • the thickness of the body is made smaller than five times the wavelength, it will be possible, although the said boundary surfaces extend substantially parallel to the direction of propagation of the ultrasonic wave, either to provide on the said boundary surfaces material which damps the ultrasonic wave or attenuates it in another manner or, for example, to etch parts of these boundary surfaces so as to ensure effective attenuation of the undesirable ultrasonic wave passing these parts.
  • the body thickness is made greater this manner of damping is insufficiently effective.
  • a thickness of, for example, 1 mm. is chosen. A smaller thickness also is permissible so long as sufficient mechanical strength is provided.
  • the wavelength is about 0.6 mm. Thus the thickness is smaller than twice the wavelength.
  • FIG. 1 is a plan view of an ultrasonic delay line according to the invention.
  • FIG. 2 is a side elevation thereof.
  • the delay line shown in Fig. l comprises a body ll composed of a suitably chosen material, for example, glass.
  • the body 1 has the shape of a parallelopipedum with pentagonal base having parallel sides 2 and 3, a side 4 at right angles thereto and sides 5 and 6 at angles of about C. to the sides 2 and 3
  • Transducers 7 and 8 are provided on sides 5 and 6, respectively, so that the mechanical vibration produced by the transducer 7 is successively reflected at the faces 2, 3, 4, 2 and 3 before striking the transducer 8.
  • the thickness d of the body l is made smaller than five times, preferably smaller than twice, the wavelength of the ultrasonic mechanical vibration.
  • the transducers 7 and 8 are polarized parallel to their surfaces 5 and 6 of contact with the body 1, respectively, and also parallel to the upper and lower boundary surfaces 9 and 10, respectively, of the body l, which latter surfaces may beformed by cutting the body from a larger body of glass.
  • damping material 1111 for example, silicone rubber, is provided in the form of a layer 1% mm. thick on the surfaces 9 and/or 10 in the areas shown by hatching in Fig. l.
  • the said choice of the direction of polarization ensures that the surfaces 9 and 110, which in themselves have little damping power, act as mirrors for the ultrasonic mechanical vibration owing to the small thickness d used, so that the damping material lll effectively contributes to the fact that the ultrasonic wave emitted by the transducer 7 is compelled to follow the path shown towards the transducer 3.
  • undesirable stray radiation and consequent undesirable blurring of the delay time to be produced are avoided.
  • An ultrasonic delay line comprising, a solid body for transmitting ultrasonic wave energy along a desired path in the body, one or more transducers in contact with the body for converting electrical energy into ultrasonic mechanical vibration energy and vice versa, said body comprising first and second boundary surfaces which extend at right angles to the thickness dimension and substantially parallel to the desired direction of propagation of the ultrasonic wave in the body, said thickness dimension of the body being less than five times the wavelength of the mechanical vibration, said transducers being polarized parallel to the first and second boundary surfaces of the body and also parallel to their surfaces of contact with the body, said contact surfaces being at right angles to said boundary surfaces, and wave energy attenuation means located on suitably chosen parts of the boundary surfaces that lie outside of the desired path of the ultrasonic wave thereby to attenuate wave energy impinging thereon.
  • An ultrasonic delay device comprising a thin flat solid body for transmitting ultrasonic wave energy along a desired propagation path within the body, said body comprising first and second boundary surfaces extending normal to the thickness dimension of the body and substantially parallel to said desired energy propagation path and third and fourth side surfaces which extend normal to said boundary surfaces, said thickness dimension being less than five times the wavelength of the ultrasonic wave energy, an electromechanical input transducer in contact with said third surface and an electromechanical output transducer in contact with the fourth surface, said transducers being polarized parallel to the boundary surfaces and parallel to their respective contact surfaces. and wave energy attenuation means located on at least one of said boundary surfaces at given areas that lie outside of the desired energy propagation path thereby to effectively confine the wave energy to said desired path by dissipating the wave energy impinging thereon.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US872913A 1968-11-09 1969-10-31 Ultrasonic delay line Expired - Lifetime US3611200A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL686816005A NL153046B (nl) 1968-11-09 1968-11-09 Ultrasone vertragingslijn.

Publications (1)

Publication Number Publication Date
US3611200A true US3611200A (en) 1971-10-05

Family

ID=19805112

Family Applications (1)

Application Number Title Priority Date Filing Date
US872913A Expired - Lifetime US3611200A (en) 1968-11-09 1969-10-31 Ultrasonic delay line

Country Status (10)

Country Link
US (1) US3611200A (enrdf_load_stackoverflow)
AT (1) AT294918B (enrdf_load_stackoverflow)
BE (1) BE741467A (enrdf_load_stackoverflow)
CH (1) CH516260A (enrdf_load_stackoverflow)
DE (1) DE6941263U (enrdf_load_stackoverflow)
FR (1) FR2022975A1 (enrdf_load_stackoverflow)
GB (1) GB1230036A (enrdf_load_stackoverflow)
NL (1) NL153046B (enrdf_load_stackoverflow)
SE (1) SE376522B (enrdf_load_stackoverflow)
YU (1) YU36248B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080131A3 (en) * 1981-11-25 1985-04-17 Showa Electric Wire & Cable Co.,Ltd. Solid ultrasonic delay line
US4684906A (en) * 1985-06-14 1987-08-04 Showa Electric Wire & Cable Co., Ltd. Solid ultrasonic delay line
US20090272571A1 (en) * 2008-04-30 2009-11-05 Tyco Electronics Corporation Cabling having shielding separators

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS485637U (enrdf_load_stackoverflow) * 1971-06-03 1973-01-23
JPS589603B2 (ja) * 1971-12-01 1983-02-22 ミツミ電機株式会社 櫛形フイルタ
JPS48102549A (enrdf_load_stackoverflow) * 1972-04-05 1973-12-22
GB9523953D0 (en) * 1995-11-23 1996-01-24 Philips Electronics Nv Comb filter modules and television apparatus incorporating such

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748438A (en) * 1953-11-30 1956-05-02 Marconi Wireless Telegraph Co Improvements in or relating to ultrasonic delay devices
CA576053A (en) * 1959-05-19 L. Robinson John Delay line
US3173100A (en) * 1961-04-26 1965-03-09 Bell Telephone Labor Inc Ultrasonic wave amplifier
US3307120A (en) * 1962-09-26 1967-02-28 Bell Telephone Labor Inc Ultrasonic wave device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA576053A (en) * 1959-05-19 L. Robinson John Delay line
GB748438A (en) * 1953-11-30 1956-05-02 Marconi Wireless Telegraph Co Improvements in or relating to ultrasonic delay devices
US3173100A (en) * 1961-04-26 1965-03-09 Bell Telephone Labor Inc Ultrasonic wave amplifier
US3307120A (en) * 1962-09-26 1967-02-28 Bell Telephone Labor Inc Ultrasonic wave device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080131A3 (en) * 1981-11-25 1985-04-17 Showa Electric Wire & Cable Co.,Ltd. Solid ultrasonic delay line
US4684906A (en) * 1985-06-14 1987-08-04 Showa Electric Wire & Cable Co., Ltd. Solid ultrasonic delay line
EP0213288A3 (en) * 1985-06-14 1988-02-10 Showa Electric Wire & Cable Co.,Ltd. Solid ultrasonic delay line
US20090272571A1 (en) * 2008-04-30 2009-11-05 Tyco Electronics Corporation Cabling having shielding separators
US7834271B2 (en) * 2008-04-30 2010-11-16 Tyco Electronics Corporation Cabling having shielding separators

Also Published As

Publication number Publication date
BE741467A (enrdf_load_stackoverflow) 1970-05-08
NL153046B (nl) 1977-04-15
SE376522B (enrdf_load_stackoverflow) 1975-05-26
DE1953412B2 (de) 1972-08-17
YU36248B (en) 1982-02-25
NL6816005A (enrdf_load_stackoverflow) 1970-05-12
AT294918B (de) 1971-12-10
YU267569A (en) 1981-06-30
DE1953412A1 (de) 1970-06-11
DE6941263U (de) 1972-04-06
FR2022975A1 (enrdf_load_stackoverflow) 1970-08-07
GB1230036A (enrdf_load_stackoverflow) 1971-04-28
CH516260A (de) 1971-11-30

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