A highly sensitive and low-cost sagnac loop based pressure sensor

Lok Hin Cho, Chuang Wu, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)


A pressure sensor based on Sagnac loop using polarization-maintaining photonic crystal fiber operating at 850 nm with much extended measuring range is experimentally demonstrated. We propose a frequency and phase detection technique to enable much extended measurement range comparing with previously proposed schemes. The scheme gives a linear relationship between phase and pressure variation. Experimental results agree well with theoretical predications. The study also shows that operating at 850 nm improves pressure sensitivity by about three times compared with sensors operating at 1550 nm. It enables the use of low-cost and high-speed charge-coupled device interrogator for measurement.
Original languageEnglish
Article number6512573
Pages (from-to)3073-3078
Number of pages6
JournalIEEE Sensors Journal
Issue number8
Publication statusPublished - 31 Jul 2013


  • Fiber optics
  • pressure measurement
  • Sagnac interferometers

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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