Design, fabrication of line-focus lens-less polyvinylidene fluoride transducers and applications on measuring surface acoustic waves with V(f, z) analytical method

Cunfu He, Yan Lü, Guorong Song, Bin Wu, Yung-Chun Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Line-focus-beam ultrasonic material property characterization system enables accurate measurements on the phase velocities of leaky surface acoustic waves (LSAW) or rayleigh-type leaky surface acoustic waves. But in view of the lens of the conventional acoustic microscopy is expensive and difficult to produce, new method of design and fabrication of two line-focus lens-less polyvinylidene fluoride (PVDF) transducers is presented for acoustic microscopy system utilizing a 40 μm thick piezoelectric PVDF film to construct the active element. The transducers introduced here centre around 5 MHz and 11 MHz respectively. Different from high cost of equipments and measuring the oscillation period Δz on an operation of tone-burst mode, an improved V(f, z) method based on tow-dimensional Fourier transform is developed for the broadband measurements. A defocusing system for measuring surface acoustic waves is established and a non-contact immersion experiment of a polished fused quartz is carried out. The LSAW velocity extracted by V(f, z) analytical technique is compared with the theoretical one and they both are in good agreement.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJixie Gongcheng Xuebao/Journal of Mechanical Engineering
Volume47
Issue number24
DOIs
Publication statusPublished - 2011 Dec 20

Fingerprint

Surface Acoustic Wave
Transducer
Analytical Methods
Surface waves
Lens
Transducers
Lenses
Fabrication
Acoustic waves
Line
Microscopy
Acoustics
Phase Velocity
Phase velocity
Non-contact
Acoustic wave velocity
Immersion
Burst
Rayleigh
Material Properties

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

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abstract = "Line-focus-beam ultrasonic material property characterization system enables accurate measurements on the phase velocities of leaky surface acoustic waves (LSAW) or rayleigh-type leaky surface acoustic waves. But in view of the lens of the conventional acoustic microscopy is expensive and difficult to produce, new method of design and fabrication of two line-focus lens-less polyvinylidene fluoride (PVDF) transducers is presented for acoustic microscopy system utilizing a 40 μm thick piezoelectric PVDF film to construct the active element. The transducers introduced here centre around 5 MHz and 11 MHz respectively. Different from high cost of equipments and measuring the oscillation period Δz on an operation of tone-burst mode, an improved V(f, z) method based on tow-dimensional Fourier transform is developed for the broadband measurements. A defocusing system for measuring surface acoustic waves is established and a non-contact immersion experiment of a polished fused quartz is carried out. The LSAW velocity extracted by V(f, z) analytical technique is compared with the theoretical one and they both are in good agreement.",
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AU - He, Cunfu

AU - Lü, Yan

AU - Song, Guorong

AU - Wu, Bin

AU - Lee, Yung-Chun

PY - 2011/12/20

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AB - Line-focus-beam ultrasonic material property characterization system enables accurate measurements on the phase velocities of leaky surface acoustic waves (LSAW) or rayleigh-type leaky surface acoustic waves. But in view of the lens of the conventional acoustic microscopy is expensive and difficult to produce, new method of design and fabrication of two line-focus lens-less polyvinylidene fluoride (PVDF) transducers is presented for acoustic microscopy system utilizing a 40 μm thick piezoelectric PVDF film to construct the active element. The transducers introduced here centre around 5 MHz and 11 MHz respectively. Different from high cost of equipments and measuring the oscillation period Δz on an operation of tone-burst mode, an improved V(f, z) method based on tow-dimensional Fourier transform is developed for the broadband measurements. A defocusing system for measuring surface acoustic waves is established and a non-contact immersion experiment of a polished fused quartz is carried out. The LSAW velocity extracted by V(f, z) analytical technique is compared with the theoretical one and they both are in good agreement.

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