Amplitude-multiplexing of Mach-Zehnder interferometer array and its application of locating acoustic emission

Jianmin Gong, J. M K MacAlpine, Wei Jin, Yanbiao Liao

Research output: Journal article publicationConference articleAcademic researchpeer-review


We report an amplitude division multiplexed interferometric sensor array for locating acoustic emission. The interferometer is composed of 3 arms, the two sensing arms have different interference amplitude with the reference arm, so we can judge whether a sensor receives sound or not from the composite interference amplitude. For single sound source, the sound-receiving delay of two sensors can be obtained from the time when the interference amplitude changes, and the sound source location relative to the sensors can also be achieved in a 1-D system. Preliminary experiments were carried out and demonstrated a one-dimensional (1-D) location accuracy of better than 1cm. The system can be extended for 2-D and 3-D location of acoustic emissions by adding one or two more sensing arms, respectively, in the interferometer.
Original languageEnglish
Pages (from-to)349-354
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Dec 2001
EventAdvanced Photonic Sensors and Applications II - Singapore, Singapore
Duration: 27 Nov 200130 Nov 2001


  • Acoustic location
  • Amplitude-multiplexing
  • Interferometer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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