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Plastic optical fiber respiration sensor based on in‐fiber microholes
Dohyun Ahn, 1 Young June Park, 2 Jong-Dug Shin, 3 Jongmin Lee, 1 Jaehee Park 2
1  Department of Biomedical EngineeringKyungpook National University Daegu South Korea
2  Department of Electronic EngineeringKeimyung University Daegu South Korea
3  School of Electronic EngineeringSoongsil University Seoul South Korea

Published: 22 November 2018 by Wiley in Microwave and Optical Technology Letters
Wiley, Volume 61; 10.1002/mop.31524
Abstract: This paper presents a novel respiration sensor based on multiple in‐fiber microholes drilled along a plastic optical fiber (POF) that is stitched to a waist‐band wrapped around the patient's abdomen. The bending loss of a POF with a single microhole is analyzed in order to enhance the sensor sensitivity. Several sensors were fabricated using a 1.5 mm‐diameter POF with different numbers and spacing of 0.7 mm‐diameter microholes. The sensitivity of the respiration sensor increased when increasing the number and spacing of the microholes, where the POF respiration sensor with seven 0.7 mm‐diameter in‐fiber microholes spaced at 15 mm showed the highest sensitivity and sufficient strength for respiratory monitoring. Thus, the experimental results confirmed that a POF sensor based on in‐fiber microholes can be effectively used to monitor the respiration of patients.
Keywords: Optical fiber sensor, plastic optical fiber, Respiration, in‐fiber microhole
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