Surface acoustic wavefront sensor using custom optics

Steve D. Sharples, Matthew Clark, Michael Geoffrey Somekh

Research output: Journal article publicationConference articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

We have designed and had manufactured a custom surface acoustic wavefront sensor, using a standard CMOS process. Ultrasound propagating along the surface of an object perturbs the reflection of incident laser light, which has been focused onto the object using a cylindrical lens. These high-frequency angular perturbations of reflected light relate to the amplitude and phase of the ultrasound along a line on the surface of the object, and thus correspond to the acoustic wavefront. The reflected light is imaged onto a custom linear array of split photodiodes; these simultaneously detect the high-frequency perturbations at several discrete points along the line, forming an acoustic wavefront sensor. As well as a description of the device, its role within an adaptive optical scanning acoustic microscope is discussed. The sensor detects the distortions to the acoustic wavefront after it has propagated through an aberrating medium, such as a metal containing grains of random orientation. The information attained may then be used to alter the generation profile of the optical generation source of the acoustic waves, thus reducing the distortion caused by the aberration and increasing the resolution and accuracy of the system as a whole.
Original languageEnglish
Pages (from-to)647-651
Number of pages5
JournalUltrasonics
Volume42
Issue number1-9
DOIs
Publication statusPublished - 1 Apr 2004
Externally publishedYes
EventProceedings of Ultrasonics International 2003 - Granada, Spain
Duration: 30 Jun 20033 Jul 2003

Keywords

  • Aberration correction
  • Acoustic aberrations
  • Acoustic sensors
  • Laser ultrasound
  • SAW

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Acoustics and Ultrasonics

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