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http://dx.doi.org/10.5369/JSST.2018.27.6.407

Measurement of Apnea Using a Polyvinylidene Fluoride Sensor Inserted in the Pillow  

Keum, dong-Wi (Department of Electonic Engineering, Hoseo University)
Kim, Jeong-Do (Department of Electonic Engineering, Hoseo University)
Publication Information
Journal of Sensor Science and Technology / v.27, no.6, 2018 , pp. 407-413 More about this Journal
Abstract
Most sleep apnea patients exhibit severe snoring, and long-lasting sleep apnea may cause insomnia, hypertension, cardiovascular diseases, stroke, and other diseases. Although polysomnography is the typical sleep diagnostic method to accurately diagnose sleep apnea by measuring a variety of bio-signals that occur during sleep, it is inconvenient as the patient has to sleep with attached electrodes at the hospital for the diagnosis. In this study, a diagnostic pillow is designed to measure respiration, heart rate, and snoring during sleep, using only one polyvinylidene fluoride (PVDF) sensor. A PVDF sensor with piezoelectric properties was inserted into a specially made instrument to extract accurate signals regardless of the posture during sleep. Wavelet analysis was used to identify the extractability and frequency domain signals of respiration, heart rate, and snoring from the signals generated by the PVDF sensor. In particular, to separate the respiratory signal in the 0.2~0.5 Hz frequency region, wavelet analysis was performed after removing 1~2 Hz frequency components. In addition, signals for respiration, heart rate, and snoring were separated from the PVDF sensor signal through a Butterworth filter and median filter based on the information obtained from the wavelet analysis. Moreover, the possibility of measuring sleep apnea from these separated signals was confirmed. To verify the usefulness of this study, data obtained during sleeping was used.
Keywords
PVDF sensor; a sleeping diagnostic pillow; Wavelet; Heart Signal; the respiratory signal; the snoring signal;
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