Compact phase-shifted Sagnac interferometer for ultrasound detection

P. A. Fomitchov*, S. Krishnaswamy, J. D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


A compact fibre, phase-shifted Sagnac interferometer for ultrasound detection has been developed. The interferometer is a truly path-matched device, and therefore requires no path stabilization or heterodyning. It is a less expensive and more robust alternative to the heterodyne or path-stabilized Michelson interferometer. The device provides high spatial resolution of ultrasonic detection. It has been used in conjunction with conventional piezoelectric transducers (PZT) to detect Rayleigh and Lamb waves and to image a crack in a thin plate, rivet cracks in riveted plates, and for ultrasonic beam profiling.

Original languageEnglish (US)
Pages (from-to)333-338
Number of pages6
JournalOptics and Laser Technology
Issue number6
StatePublished - Sep 1997


  • Laser-based ultrasonics
  • Non-destructive evaluation
  • Sagnac interferometers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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