GB1395932A - Focussing of ultrasonic waves - Google Patents

Focussing of ultrasonic waves

Info

Publication number
GB1395932A
GB1395932A GB3723272A GB3723272A GB1395932A GB 1395932 A GB1395932 A GB 1395932A GB 3723272 A GB3723272 A GB 3723272A GB 3723272 A GB3723272 A GB 3723272A GB 1395932 A GB1395932 A GB 1395932A
Authority
GB
United Kingdom
Prior art keywords
mirror
ultrasonic
spherical
axis
focal line
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
GB3723272A
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.)
F Hoffmann La Roche AG
Original Assignee
F Hoffmann La Roche AG
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
Priority claimed from SE14848/71A external-priority patent/SE365583B/xx
Application filed by F Hoffmann La Roche AG filed Critical F Hoffmann La Roche AG
Publication of GB1395932A publication Critical patent/GB1395932A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/42—Details of probe positioning or probe attachment to the patient
    • A61B8/4272—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue
    • A61B8/4281—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue characterised by sound-transmitting media or devices for coupling the transducer to the tissue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/221—Arrangements for directing or focusing the acoustical waves
    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Acoustics & Sound (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Biophysics (AREA)
  • Analytical Chemistry (AREA)
  • Radiology & Medical Imaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Multimedia (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

1395932 Ultrasonic probes; ultrasonic reflectors and lenses F HOFFMANN-LA ROCHE & CO AG 9 Aug 1972 [7 Oct 1971 12 Oct 1971] 37232/72 Headings H4J and H4X An ultrasonic field for use in materials testing and in medical diagnosis has an annular cross-section and is converged along a focal line extending in the direction of propagation. Ultrasonic wave energy from a piezoelectric transducer 1 is first conveyed by a lens 5 of acrylic material. Silicone grease 6 acts as an ultrasonic coupling medium. An annular plate 9, e.g. of brass, acts as a mirror and its mirror surface is concave and has a non-spherical mirror surface which is a surface of revolution about the axis of the annulus. A spherical ultrasonic mirror 11, e.g. of brass, is spaced from plate 9 by struts 15. An ultrasonic pulse emitted by transducer 1 is, after being conveyed by lens 5, diverged by mirror 11 and focused by mirror 9. The non-spherical shape of mirror 9 results in convergence to a focal line. In alternative arrangements, the mirror 9 is spherical and the mirror 11 is non-spherical, or mirrors 9 and 11 are both non-spherical. In yet another arrangement (not shown), a non-spherical mirror is replaced by an acoustic lens having a non-spherical surface. An alternative embodiment (Fig. 2) uses an ultrasonic transducer 17 and a diverging lens 18 on the axis of a hollow cylinder 16. Ultrasonic rays 19 reflected from the inner wall of cylinder 16 converge on a focal line on the axis. Yet another embodiment (Fig. 3) uses an annular housing 21 of U-shaped cross-section. An annular damping block 24 of epoxy resin/ tungsten is insulated from housing 21 by cork panels 22. Four flat segments 23 of piezoelectric material together form a ring and are covered by epoxy resin 25. A lead 26 runs to each segment 23. Ultrasonic waves converge on a focal line on the axis. The length of the focal line is determined, inter alia, by the width of segments 23 and their inclination to the axis. The same transducer may be used for transmitting and receiving.
GB3723272A 1971-10-07 1972-08-09 Focussing of ultrasonic waves Expired GB1395932A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1458871 1971-10-07
SE14848/71A SE365583B (en) 1970-11-21 1971-11-19

Publications (1)

Publication Number Publication Date
GB1395932A true GB1395932A (en) 1975-05-29

Family

ID=26656006

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3723272A Expired GB1395932A (en) 1971-10-07 1972-08-09 Focussing of ultrasonic waves

Country Status (1)

Country Link
GB (1) GB1395932A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005116A1 (en) * 1978-04-20 1979-10-31 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Method of exploring an object by means of a ray
CN113533527A (en) * 2021-06-26 2021-10-22 西北工业大学 Aspheric surface focusing deep-scene ultrasonic detector and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005116A1 (en) * 1978-04-20 1979-10-31 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Method of exploring an object by means of a ray
FR2443072A1 (en) * 1978-04-20 1980-06-27 Commissariat Energie Atomique OPTICAL FOR EXPLORING A PART BY A BEAM
CN113533527A (en) * 2021-06-26 2021-10-22 西北工业大学 Aspheric surface focusing deep-scene ultrasonic detector and method

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee