Microstructured optical fiber based Fabry–Pérot interferometer as a humidity sensor utilizing chitosan polymeric matrix for breath monitoring

Anand M. Shrivastav, Dinusha S. Gunawardena, Zhengyong Liu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


This study reports a method for humidity sensing based on a specialty microstructured optical fiber (MOF). A suspended tri-core MOF was fabricated using the stack and draw technique. A low finesse sensing head was prepared by depositing a chitosan polymer matrix within the holes of the MOF, forming a Fabry-Pérot interferometer as a sensing platform while the chitosan film acts as the sensing material. The use of the probe for real-time breath monitoring was also successfully demonstrated. The probe possessed a maximum sensitivity of 81.05 pm/(%RH) for 90–95%RH range while the linear region of the sensor ranged from 70–95%RH. The temperature cross correlation was also experimented, and a lower influence of external temperature was observed. The probe shows an ultrafast response during human breath monitoring with a rising time and recovery time of 80 ms and 70 ms, respectively.

Original languageEnglish
Article number6002
JournalScientific Reports
Issue number1
Publication statusPublished - 1 Dec 2020

ASJC Scopus subject areas

  • General

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