High pressure sensor based on photonic crystal fiber for downhole application

H. Y. Fu, Chuang Wu, M. L.V. Tse, Lin Zhang, Kei Chun Davis Cheng, Hwa Yaw Tam, Bai Ou Guan, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

115 Citations (Scopus)


We demonstrate a polarization-maintaining (PM) photonic crystal fiber (PCF) based Sagnac interferometer for downhole high pressure sensing application. The PM PCF serves as a direct pressure sensing probe. The sensor is transducer free and thus fundamentally enhances its long-term sensing stability. In addition, the PM PCF can be coiled into a small diameter to fulfill the compact size requirement of downhole application. A theoretical study of its loss and birefringence changes with different coiling diameters has been carried out. This bend-insensitive property of the fiber provides ease for sensor design and benefits practical application. The pressure sensitivities of the proposed sensor are 4.21 and 3:24 nm/MPa at ∼1320 and ∼1550nm, respectively. High pressure measurement up to 20MPa was achieved with our experiment. It shows both good linearity in response to applied pressure and good repeatability within the entire measurement range. The proposed pressure sensor exhibits low temperature cross sensitivity and high temperature sustainability. It functions well without any measurable degradation effects on sensitivity or linearity at a temperature as high as 293 °C. These characteristics make it a potentially ideal candidate for downhole pressure sensing.
Original languageEnglish
Pages (from-to)2639-2643
Number of pages5
JournalApplied Optics
Issue number14
Publication statusPublished - 10 May 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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