Detection of acoustic emission in structure using Sagnac-like fiber-loop interferometer

Libo Yuan, Li Min Zhou, Wei Jin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

39 Citations (Scopus)


A Sagnac-like fiber-loop interferometer sensor has been proposed for the detection of micro crack induced acoustic emission in concrete structures. The use of a Sagnac-like configuration eliminates much of the undesirable noise by combining the reference and the sensing arms within the same optical fiber. The photo-elastic response of optical fiber to ultrasonic stress wave in elastic structural material and the effect of the soft fiber coating are analyzed. The sensor can be configured as a long gauge length sensor to detect the existence of acoustic emission in a large structural area, or as a point sensor with a short gauge length or a coiled long fiber length to detect acoustic wave at a particular location in a structure. Experiments were conducted and compared with the results from traditional piezoelectric transducers.
Original languageEnglish
Pages (from-to)6-13
Number of pages8
JournalSensors and Actuators, A: Physical
Issue number1
Publication statusPublished - 31 Jan 2005


  • Fiber optic interferometer
  • Fiber optic sensor
  • Sagnac loop
  • Ultrasonic detector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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