Adaptive heterodyne photorefractive interferometer for ultrasound detection: Optimization & application

R. K. Ing*, B. F. Pouet, Sridhar Krishnaswamy, D. Royer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The advantages of ultrasonic remote detection using a heterodyne photorefractive interferometer are demonstrated. The speckle nature of the light reflected by a rough surface (or after propagation through a multimode fiber) does not degrade the interferometer sensitivity. Thanks to the process of wave mixing in photorefractive crystals, this interferometer has a large etendue. Furthermore, the heterodyne detection provides an absolute measurement of the ultrasonic amplitudes. In this paper, we investigate the influence of an applied ac electric field. Two photorefractive crystals, undoped BSO and BSO:Cr, which have different optical characteristics are compared. Finally, examples of application to NDE are demonstrated.

Original languageEnglish (US)
Pages (from-to)613-616
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
StatePublished - Dec 1 1997

ASJC Scopus subject areas

  • Engineering(all)

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