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Research Papers: Sensing

Microstructured optical fiber interferometric breathing sensor

[+] Author Affiliations
Fernando C. Favero

Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, 22453–900, Rio de Janeiro, Brazil

ICFO-The Institute of Photonic Sciences, Mediterranean Technology Park, Av. Carl Friedrich Gauss, number 3, 08860 Castelldefels, Barcelona, Spain

Joel Villatoro

ICFO-The Institute of Photonic Sciences, Mediterranean Technology Park, Av. Carl Friedrich Gauss, number 3, 08860 Castelldefels, Barcelona, Spain

Valerio Pruneri

Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, 22453–900, Rio de Janeiro, Brazil

ICREA-Institució Catalana de Recerca i Estudis Avançats, 08010, Barcelona, Spain

J. Biomed. Opt. 17(3), 037006 (Mar 23, 2012). doi:10.1117/1.JBO.17.3.037006
History: Received September 13, 2011; Revised January 5, 2012; Accepted January 13, 2012
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Abstract.  In this paper a simple photonic crystal fiber (PCF) interferometric breathing sensor is introduced. The interferometer consists of a section of PCF fusion spliced at the distal end of a standard telecommunications optical fiber. Two collapsed regions in the PCF caused by the splicing process allow the excitation and recombination of a core and a cladding PCF mode. As a result, the reflection spectrum of the device exhibits a sinusoidal interference pattern that instantly shifts when water molecules, present in exhaled air, are adsorbed on or desorbed from the PCF surface. The device can be used to monitor a person’s breathing whatever the respiration rate. The device here proposed could be particularly important in applications where electronic sensors fail or are not recommended. It may also be useful in the evaluation of a person’s health and even in the diagnosis and study of the progression of serious illnesses such as sleep apnea syndrome.

Figures in this Article
© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Fernando C. Favero ; Joel Villatoro and Valerio Pruneri
"Microstructured optical fiber interferometric breathing sensor", J. Biomed. Opt. 17(3), 037006 (Mar 23, 2012). ; http://dx.doi.org/10.1117/1.JBO.17.3.037006


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