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Proceedings Paper

Construction and calibration of a new design of fiber optic respiratory plethysmograph (FORP)
Author(s): Francois-Xavier Maletras; Andreas T. Augousti; Julian Mason
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Paper Abstract

The Fiber Optic Respiratory Plethysmograph (FORP) is a non-invasive instrument for respiratory and heart monitoring in humans, based on the design of the Respiratory Inductive Plethysmograph (RIP. The FORP uses two sensors at thoracic and abdominal levels that measure circumferences rather than the cross sectional areas measured by the RIP. Each sensor is made of a specifically looped optical fiber that responds to elongation with variation in light transmission, via the macrobending loss effect. The design and construction of the original version of the FORP has been reported previously 1. This paper presents the results of a new figure-of-eight construction for the fiber loops. The resulting system shows greater signal range, increased linearity and less hysteresis than former constructions. Results are presented detailing the calibration of the respiratory measurements against a spirometer using a range of calibration protocols, one based on isovolume breathing and others on a Least Mean Square (LMS) fit. Additional improvements to signal processing and the increased sensitivity of the new design now make it practicable to detect torso motion arising from cardiac activity. This paper also presents results showing the simultaneous monitoring of respiratory and cardiac signals, using only the FORP transducers.

Paper Details

Date Published: 5 November 2001
PDF: 9 pages
Proc. SPIE 4444, Optomechanical Design and Engineering 2001, (5 November 2001); doi: 10.1117/12.447308
Show Author Affiliations
Francois-Xavier Maletras, Kingston Univ. (United Kingdom)
Andreas T. Augousti, Kingston Univ. (United Kingdom)
Julian Mason, Kingston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4444:
Optomechanical Design and Engineering 2001
Alson E. Hatheway, Editor(s)

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