GB469018A - Improvements in or relating to the generation of mechanical waves of supersonic frequency - Google Patents

Improvements in or relating to the generation of mechanical waves of supersonic frequency

Info

Publication number
GB469018A
GB469018A GB118136A GB118136A GB469018A GB 469018 A GB469018 A GB 469018A GB 118136 A GB118136 A GB 118136A GB 118136 A GB118136 A GB 118136A GB 469018 A GB469018 A GB 469018A
Authority
GB
United Kingdom
Prior art keywords
crystal assembly
space
substance
refractive index
mechanical waves
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
Application number
GB118136A
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.)
Scophony Ltd
Original Assignee
Scophony 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 Scophony Ltd filed Critical Scophony Ltd
Priority to GB118136A priority Critical patent/GB469018A/en
Publication of GB469018A publication Critical patent/GB469018A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

469,018. Piezo - electric vibrators. SCOPHONY, Ltd., and JEFFREE, J. H. Jan. 14, 1936, No. 1181. [Class 40 (iv)] [Also in Group XL] In a device for generating mechanical waves of supersonic frequency in a body and comprising a piezo-electric crystal assembly adapted for excitation by electrical currents of the desired frequency, there is interposed between the crystal assembly and the body and intermediate layer of a third substance having a thickness of substantially one half wave-length or an odd number of half wave-lengths, the intermediate layer being in contact with the body and separated from the crystal assembly by a space filled with a material having an acoustic refractive index less than that of the crystal assembly and not less than that of the body, the thickness of the material in the space being substantially one quarter of a wave-length or an odd number of quarter wavelengths and the third substance having an acoustic refractive index which is intermediate of those of the crystal assembly and the material in the space. The third substance may be aluminium or a glass having a suitable acoustic refractive index, and the material in the space may be wax, cellulose, shellac, resin, the material known under the Registered Trade Mark " Cellophane," or the material of the body. The device may be used in the lightmodulating arrangement described in Specification 439,236, [Group. XL]. Specification 466,212 also is referred to.
GB118136A 1936-01-14 1936-01-14 Improvements in or relating to the generation of mechanical waves of supersonic frequency Expired GB469018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB118136A GB469018A (en) 1936-01-14 1936-01-14 Improvements in or relating to the generation of mechanical waves of supersonic frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB118136A GB469018A (en) 1936-01-14 1936-01-14 Improvements in or relating to the generation of mechanical waves of supersonic frequency

Publications (1)

Publication Number Publication Date
GB469018A true GB469018A (en) 1937-07-14

Family

ID=9717554

Family Applications (1)

Application Number Title Priority Date Filing Date
GB118136A Expired GB469018A (en) 1936-01-14 1936-01-14 Improvements in or relating to the generation of mechanical waves of supersonic frequency

Country Status (1)

Country Link
GB (1) GB469018A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704333A (en) * 1951-03-15 1955-03-15 Raytheon Mfg Co Ultrasonic vibratory devices
DE956361C (en) * 1939-04-12 1957-01-17 Siemens Ag Arrangement for holding oscillating crystals
US2830201A (en) * 1950-11-02 1958-04-08 Kelvin & Hughes Ltd Electro-acoustic transducer with acoustic coupling means
WO1984001233A1 (en) * 1982-09-15 1984-03-29 Syrinx Precision Instr Ultrasonic measurement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956361C (en) * 1939-04-12 1957-01-17 Siemens Ag Arrangement for holding oscillating crystals
US2830201A (en) * 1950-11-02 1958-04-08 Kelvin & Hughes Ltd Electro-acoustic transducer with acoustic coupling means
US2704333A (en) * 1951-03-15 1955-03-15 Raytheon Mfg Co Ultrasonic vibratory devices
WO1984001233A1 (en) * 1982-09-15 1984-03-29 Syrinx Precision Instr Ultrasonic measurement
US4580448A (en) * 1982-09-15 1986-04-08 Acumet Precision Instruments, Ltd. Method and apparatus for ultrasonic measurement of a physical parameter

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