CHOTs optical transducers

Ahmet Arca, Jon Aylott, Leonel Marques, Matt Clark, Michael Geoffrey Somekh, Richard Smith, Steve Sharples, Teti Stratoudaki, Xuesheng Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Laser ultrasonics conventionally use direct absorption in the sample to generate ultrasound and monitor the sample to detect the ultrasound. However, in some circumstances there are significant advantages to using an optical transducer - a device to facilitate the conversion of optical energy into acoustic energy or to facilitate the modulation of light by an acoustic wave. These devices are known as 'cheap optical transducers' (CHOTs). For some applications, they offer considerable advantages over conventional laser ultrasonics or conventional contact ultrasonics. In this paper, the design, operation and applications of CHOTs are discussed, and the concept is extended to the use of superCHOTs that can achieve amplitudes and sensitivities above the usual laser ultrasound limits, nano-scale devices capable of the generation and the detection of ultrasound with wavelengths smaller than that of visible light and devices capable of generating modes not normally accessible to laser ultrasound.
Original languageEnglish
Pages (from-to)353-366
Number of pages14
JournalNondestructive Testing and Evaluation
Issue number3-4
Publication statusPublished - 1 Sept 2011
Externally publishedYes


  • CHOTs
  • laser ultrasonics
  • optical detection
  • optical generation
  • transducers

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • General Physics and Astronomy


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