Open AccessWearable respiration monitoring using an in-line few-mode fiber Mach-Zehnder interferometric sensor
Author(s) -
Ruihang Wang,
Jing Zhao,
Ye Sun,
Hua Yu,
N. Zhou,
Hongxia Zhang,
Dagong Jia
Publication year - 2019
Publication title -
biomedical optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.376782
Subject(s) - spirometer , interferometry , sensitivity (control systems) , wearable computer , optical fiber , respiration , mach–zehnder interferometer , optics , tidal volume , respiration rate , fiber optic sensor , computer science , materials science , physics , electronic engineering , medicine , respiratory system , engineering , embedded system , exhaled nitric oxide , airway , meteorology , bronchoconstriction , anatomy
Continuous respiratory monitoring is extensively important in clinical applications. To effectively assess respiration rate (RR), tidal volume (TV), and minute ventilation (MV), we propose and experimentally demonstrate a respiration monitoring system using an in-line few-mode fiber Mach-Zehnder interferometer (FMF-MZI), which is the first to introduce in-line MZI into an optimal wearable design for respiration rate and volume monitoring. The optimal linear region of the proposed sensor is analyzed and positioned by a flexible arch structure with curvature sensitivity up to 8.53 dB/m -1 . Respiration monitoring results are in good agreement with a standard spirometer among different individuals. The difference in TV estimation is ± 0.2 L, and the overall error of MV estimation is less than 5%.