Abstract

Respiration rate and volume are important physiological indicators of human health. They can indicate cardiovascular health status and cardiopulmonary function. Here, we demonstrate a compact breath monitoring system based on a wearable tilted fiber Bragg grating (TFBG) curvature sensor for human respiration monitoring. With the assistance of a custom designed breathing tube, TFBGs provide a very reproducible highly sensitive, real time response to curvature changes during respiration. The miniaturized and cost effective sensing system which we propose consists of a tunable laser module, a field programmable gate array acquisition control circuit module, and a sensor module. Different breathing patterns can be successfully identified from the optical amplitude and frequency output of the sensor. The robust instrument displays high repeatability and real-time tracking.

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

Weihao Yuan, Lingduo Li, Yu Wang, Zhenggang Lian, Daru Chen, Changyuan Yu, and Chao Lu
Opt. Express 29(17) 26375-26384 (2021)

Wearable respiration monitoring using an in-line few-mode fiber Mach-Zehnder interferometric sensor

Ruihang Wang, Jing Zhao, Ye Sun, Hui Yu, Ning Zhou, Hongxia Zhang, and Dagong Jia
Biomed. Opt. Express 11(1) 316-329 (2020)

A miniature optical breathing sensor

Jinesh Mathew, Yuliya Semenova, and Gerald Farrell
Biomed. Opt. Express 3(12) 3325-3331 (2012)

Real-time monitoring the change process of liquid concentration using tilted fiber Bragg grating

Biqiang Jiang, Jianlian Zhao, Zhao Huang, Abdul Rauf, and Chuan Qin
Opt. Express 20(14) 15347-15352 (2012)

Optimized helical intermedium-period fiber grating for breathing monitoring

Chenxu Li, Shen Liu, Junlan Zhong, Tao Zou, Wenqi Yan, Qiao Lin, Yueliang Xiao, and Yiping Wang
Opt. Express 32(2) 1207-1217 (2024)