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Journal of Biomedical Optics

Fiber optic sensor for the measurement of the respiratory chest circumference changes
Author(s): Anatoly Babchenko; Boris Khanokh; Yoseph Shomer; Meir Nitzan
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Paper Abstract

A fiber optic sensor for the measurement of the respiratory depth has been developed. The sensor is composed of a bent optic fiber which is connected to an elastic section of a chest belt so that its radius of curvature changes during respiration due to respiratory chest circumference changes (RCCC). The measurement of light transmission through the bent fiber provides information on its changes in curvature since a higher fraction of light escapes through the core-cladding surface of a fiber bent to a lower radius of curvature. The sensor can quantitatively measure the RCCC, although in relative terms, and it is sensitive enough to detect changes of the chest circumference due to the heart beat. Measurements of the RCCC were simultaneously performed with photoplethysmography (PPG)—the measurement by light absorption of the cardiac induced blood volume changes in the tissue—and a significant correlation was found between the RCCC and some parameters of the PPG signal. The fiber optic respiratory depth sensor enables a quantitative assessment of the respiratory induced changes in the cardiovascular parameters.

Paper Details

Date Published: 1 April 1999
PDF: 6 pages
J. Biomed. Opt. 4(2) doi: 10.1117/1.429909
Published in: Journal of Biomedical Optics Volume 4, Issue 2
Show Author Affiliations
Anatoly Babchenko, Jerusalem College of Technology (Israel)
Boris Khanokh, Jerusalem College of Technology (Israel)
Yoseph Shomer, Jerusalem College of Technology (Israel)
Meir Nitzan, Jerusalem College of Technology (Israel)

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