Fiber-optic Sagnac interferometer for noncontact structural monitoring in power plant applications

Tom Carolan, R. L. Reuben, J. S. Barton, J. D C Jones

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The design of a noncontact fiber-optic sensor is described for the detection of acoustic emission for structural integrity monitoring in high-temperature power plant applications. The sensor is based on a Sagnac interferometer and produces an output proportional to target velocity, without the need for active phase stabilization. It is inherently insensitive to low-frequency perturbations of the instrument or the target and incorporates an environmentally insensitive downlead, which may be of arbitrary length. It is shown that the sensor is capable of meeting the specifications for structural integrity monitoring of high-temperature power plant components based on acoustic emission detection and has a velocity resolution of 50 nm s-1 Hz-1/2. © 1997 Optical Society of America.

Original languageEnglish
Pages (from-to)380-385
Number of pages6
JournalApplied Optics
Issue number1
Publication statusPublished - 1 Jan 1997


  • Acoustic emission
  • Fiber-optic sensor
  • Noncontact Sagnac interferometer
  • Structural integrity monitoring


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