Breath sensor based on reflective optical lensed fiber

An optical lensed fiber for detecting respiration condition in the vicinity of nose has been proposed and been demonstrated to work as a breath sensor. For simple preparation and larger sensing area, a piece of about quarter-pitch of an optical gradient index fiber (GIF) tip was spliced to the end of a single mode fiber. The sensing principle is based on the change of back reflection intensity caused by attachment of water molecules on the GIF tip during respiration. The experimental results showed that this breath sensor operated with a good sensitivity and a real-time respiration monitor was presented. In terms of the tiny size and light weight, the optical lensed fiber breath sensor is potential for the application of monitoring breathing condition in hospital and in home care. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:450–454, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27322

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