Transient analysis of fresnel zone plates for ultrasound focusing applications

Sergio Pérez-López, Daniel Tarrazó-Serrano, Dimitry O. Dolmatov, Constanza Rubio, Pilar Candelas

Research output: Contribution to journalLetterpeer-review

Abstract

Fresnel Zone Plates are planar lenses that can be used to focus ultrasound beams. This kind of acoustic lenses can play a key role in the resolution of ultrasonic NDT systems. In this type of pulse-echo applications, the pulse duration is an important parameter that specifies the axial resolution, and thus, shorter ultrasound pulses provide higher resolutions. However, acoustic lenses exhibit a transient response that should be considered when setting the pulse duration, as pulses shorter than the transient state duration result in degradation in the response of acoustic lenses in terms of focal intensity, focal displacement, and lateral and axial resolutions. In this work, a thorough analysis of the transient response of Fresnel Zone Plates is discussed, demonstrating that the transient state should be considered in order to achieve optimal focusing performance. Theoretical and numerical results are presented, showing very good agreement.

Original languageEnglish
Article number6824
Pages (from-to)1-9
Number of pages9
JournalSensors (Switzerland)
Volume20
Issue number23
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Acoustic lens
  • Fresnel zone plate
  • Temporal focusing profile
  • Transient analysis

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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