Multiplexed identical-broadband-chirped-grating interrogation system for large-strain sensing applications

R.W Fallon, L. Zhang, A. Gloag, I. Bennion

Research output: Contribution to journalArticlepeer-review


We report here a simple and low-cost technique for extreme strain measurement. The overlapping of a chirped sensor grating with an identical reference device provides a novel mechanism for measuring strain. This system permits a linear relationship between strain and resultant optical power. The maximum sensing range of the system is determined by the bandwidths of the gratings employed. A 20-nm chirped grating facilitates a sensing range up to 20 000 με. This paper also demonstrates an arrangement for multiplexing up to four gratings, which can be rapidly and truly simultaneously interrogated.

Original languageEnglish
Article number5784628
Pages (from-to)1616-1618
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number12
Publication statusPublished - Dec 1997


  • fiber Bragg gratings
  • multiplexing interrogation
  • optical sensors
  • SMART structures
  • strain sensing
  • temperature


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