A simple optical fiber interferometer based breathing sensor

Xixi Li, Dejun Liu, Rahul Kumar, Wai Pang Ng, Yong Qing Fu, Jinhui Yuan, Chongxiu Yu, Yufeng Wu, Guorui Zhou, Gerald Farrell, Yuliya Semenova, Qiang Wu

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)
37 Downloads (Pure)


A breathing sensor has been experimentally demonstrated based on a singlemode–multimode–singlemode (SMS) fiber structure which is attached to a thin plastic film in an oxygen mask. By detecting power variations due to the macro bending applied to the SMS section by each inhalation and exhalation process, the breath state can be monitored. The proposed sensor is capable of distinguishing different types of breathing conditions including regular and irregular breath state. The sensor can be used in a strong electric/magnetic field and radioactive testing systems such as magnetic resonance imaging (MRI) systems and computed tomography (CT) examinations where electrical sensors are restricted.
Original languageEnglish
Pages (from-to)035105
JournalMeasurement Science and Technology
Issue number3
Publication statusPublished - 2 Feb 2017


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