Návrh a realizace intenzitního senzoru vhodného pro měření dechové frekvence lidského těla

Abstract

This master's thesis focuses on the design, implementation, and experimental validation of a microbending sensor intended for measuring the respiratory rate, placed in the back area. The theoretical part addresses the principles of light propagation in optical fibers and describes fundamental phenomena such as attenuation, dispersion, and bending losses. It further provides an overview of various types of fiber optic sensors, with a particular emphasis on intensity-based microbending sensors. The theoretical section also includes a brief summary of methods for measuring the respiratory rate of the human body and an overview of the current state of research on the use of three types of fiber optic sensors for monitoring respiratory and cardiac activity, based on selected scientific studies and publications.

The practical part describes the design and fabrication of twelve samples of microbending plates using 3D printing technologies with materials PLA, PETG, and TPU. During the testing phase, the influence of material properties and geometric parameters on sensor sensitivity was investigated. Experimental measurements were carried out using three selected samples on a group of eight volunteers. The measured data were processed using the Python programming language. The respiratory rate obtained from the proposed sensors was compared with a reference method using Bland–Altman analysis in order to assess the agreement between the methods.