Salinity sensor based on polyimide-coated photonic crystal fiber

Chuang Wu, Bai Ou Guan, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

97 Citations (Scopus)


We proposed and experimentally demonstrated a highly sensitive salinity sensor using a polyimide-coated Hi-Bi photonic crystal fiber Sagnac interferometer based on the coating swelling induced radial pressure. This is the first time to exploit fiber coating induced pressure effect for salinity sensing. The achieved salinity sensitivity is 0.742 nm/(mol/L), which is 45 times more sensitive than that of a polyimide-coated fiber Bragg grating. A bare fiber Bragg grating is incorporated into the fiber loop for temperature compensation.
Original languageEnglish
Pages (from-to)20003-20008
Number of pages6
JournalOptics Express
Issue number21
Publication statusPublished - 10 Oct 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Salinity sensor based on polyimide-coated photonic crystal fiber'. Together they form a unique fingerprint.

Cite this