Respiration and body movement analysis during sleep in bed using hetero-core fiber optic pressure sensors without constraint to human activity

Michiko Nishyama; Mitsuo Miyamoto; Kazuhiro Watanabe

doi:10.1117/1.3528008

1 January 2011 Respiration and body movement analysis during sleep in bed using hetero-core fiber optic pressure sensors without constraint to human activity

Michiko Nishyama, Mitsuo Miyamoto, Kazuhiro Watanabe

Author Affiliations +

Journal of Biomedical Optics, Vol. 16, Issue 1, 017002 (January 2011). https://doi.org/10.1117/1.3528008

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.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Michiko Nishyama, Mitsuo Miyamoto, and Kazuhiro Watanabe "Respiration and body movement analysis during sleep in bed using hetero-core fiber optic pressure sensors without constraint to human activity," Journal of Biomedical Optics 16(1), 017002 (1 January 2011). https://doi.org/10.1117/1.3528008

Published: 1 January 2011

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KEYWORDS

Sensors

Fiber optics sensors

Fiber optics

Motion analysis

Silicon

Stomach

Biological research

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