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Journal of Biomedical Optics • Open Access

Respiration and body movement analysis during sleep in bed using hetero-core fiber optic pressure sensors without constraint to human activity
Author(s): Michiko Nishyama; Mitsuo Miyamoto; Kazuhiro Watanabe

Paper Abstract

We describe respiration monitoring in sleep using hetero-core fiber optic pressure sensors. The proposed hetero-core fiber optic sensor is highly sensitive to macrobending as a result of the core diameter difference due to stable single-mode transmission. Pressure sensors based on hetero-core fiber optics were fabricated to have a high sensitivity to small pressure changes resulting from minute body motions, such as respiration, during sleep and large pressure changes, such as those caused by a rollover. The sensors are installed in a conventional bed. The pressure characteristic performance of all the fabricated hetero-core fiber optic pressure sensors is found to show a monotonic response with weight changes. A respiration monitoring test in seven subjects efficiently demonstrates the effective use of eight hetero-core pressure sensors installed in a bed. Additionally, even in the case of different body postures, such as lying on one's side, a slight body movement due to respiration is detected by the hetero-core pressure sensors.

Paper Details

Date Published: 1 January 2011
PDF: 7 pages
J. Biomed. Opt. 16(1) 017002 doi: 10.1117/1.3528008
Published in: Journal of Biomedical Optics Volume 16, Issue 1
Show Author Affiliations
Michiko Nishyama, Soka Univ. (Japan)
Mitsuo Miyamoto, Soka Univ. (Japan)
Kazuhiro Watanabe, Soka Univ. (Japan)

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