Sound Field Calculations for an Ultrasonic Linear Phased Array with a Spherical Liquid Lens

Young Joong Yoon, Paul J. Benkeser

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Lenses are often used to provide focusing in the elevation dimension of ultrasonic linear phased-array transducers. The use of a liquid lens in this application adds a variable geometric focusing capability, determined by the radius of curvature of the lens surface and speed of sound in the liquid, to the electronic focusing produced by the linear phased array. Dynamic control of the geometrical focus can be achieved by adjusting the volume of the liquid lens. An efficient method to calculate the sound field radiated from the linear phased-array transducer through the liquid lens is presented. It treats the lens surface as a secondary source distribution according to Huygens’ principle, and employs a modified form of the rectangular radiator method to calculate the field. The appropriate phases for the array elements to focus and steer the beam are calculated by considering the refraction on the lens surface. Comparisons of computer simulations and experimental measurements of the field intensity distribution of a prototype linear array transducer with a liquid lens demonstrate the accuracy of the proposed method.

Original languageEnglish
Pages (from-to)268-272
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume39
Issue number2
DOIs
Publication statusPublished - 1992 Jan 1

Fingerprint

Acoustic fields
phased arrays
linear arrays
sound fields
Lenses
ultrasonics
Ultrasonics
lenses
Liquids
liquids
Transducers
transducers
Huygens principle
dynamic control
Acoustic wave velocity
Radiators
radiators
Refraction
refraction
computerized simulation

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

Cite this

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abstract = "Lenses are often used to provide focusing in the elevation dimension of ultrasonic linear phased-array transducers. The use of a liquid lens in this application adds a variable geometric focusing capability, determined by the radius of curvature of the lens surface and speed of sound in the liquid, to the electronic focusing produced by the linear phased array. Dynamic control of the geometrical focus can be achieved by adjusting the volume of the liquid lens. An efficient method to calculate the sound field radiated from the linear phased-array transducer through the liquid lens is presented. It treats the lens surface as a secondary source distribution according to Huygens’ principle, and employs a modified form of the rectangular radiator method to calculate the field. The appropriate phases for the array elements to focus and steer the beam are calculated by considering the refraction on the lens surface. Comparisons of computer simulations and experimental measurements of the field intensity distribution of a prototype linear array transducer with a liquid lens demonstrate the accuracy of the proposed method.",
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Sound Field Calculations for an Ultrasonic Linear Phased Array with a Spherical Liquid Lens. / Yoon, Young Joong; Benkeser, Paul J.

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 39, No. 2, 01.01.1992, p. 268-272.

Research output: Contribution to journalArticle

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