Temperature and curvature insensitive all-fiber sensor used for human breath monitoring

Weihao Yuan, Lingduo Li, Yu Wang, Zhenggang Lian, Daru Chen, Changyuan Yu, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


In this paper, an all-fiber sensor based on hollow core Bragg fiber (HCBF) is proposed and successfully manufactured, which can be used for human breath monitoring. Benefiting from the identical outer diameters of HCBF and single mode fibers (SMFs), the sensor can be directly constructed by sandwiching a segment of HCBF between two SMFs. Based on optical propagation properties of HCBF, the transmission light is sensitive to specific environmental change induced by human breath. Thus, the breath signals can be explicitly recorded by measuring the intensity of the transmitted laser. The sensor presents a rapid response time of ∼0.15 s and recovery time of ∼0.65 s. In addition, the HCBF-based sensor shows good insensitivity to the variation of temperature and curvature, which enables its reliable sensing performance in the dynamic and changeful environment.

Original languageEnglish
Pages (from-to)26375-26384
Number of pages10
JournalOptics Express
Issue number17
Publication statusPublished - 16 Aug 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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