Ultrasound detection on rough surfaces using heterodyne photorefractive interferometer: Applications to NDE

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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Heterodyne interferometers using two-wave mixing in photorefractive cubic crystals for ultrasound detection on rough surfaces is demonstrated. The speckled scattered beam from a rough surface sample interferes with a planar coherent pump beam inside a photorefractive crystal. A third frequency-shifted beam is used to read the grating. The diffracted readout beam and the transmitted signal beam are wavefront matched, resulting in an optimal heterodyne interference signal. We show that the interferometer sensitivity is independent of the surface quality and an optical fiber in the path of the probe beam can be implemented. The interferometer is characterized and results are compared with a classical heterodyne interferometer.

Original languageEnglish (US)
Pages (from-to)681-684
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Volume1
StatePublished - Dec 1 1996
EventProceedings of the 1996 IEEE Ultrasonics Symposium. Part 2 (of 2) - San Antonio, TX, USA
Duration: Nov 3 1996Nov 6 1996

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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