Unobtrusive Bed Monitor State of the Art

Figures

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  Figure 1. (Left) Physiological signal monitoring bed based on load cells [5]; (Right) load cell sensors.

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  Figure 2. Thin-film pressure sensor (Left) and array (Right).

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  Figure 3. Fiber-optic pressure sensor system [11].

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  Figure 4. (Left) Thermex® Tactile Surface Temperature; (Right) matrix arrangement sensor.

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  Figure 5. Bed ECG monitor (Left) and ECG signal (right) obtained during sleep [18].

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  Figure 6. A typical example of ECG monitoring with capacitive electrodes [22].

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  Figure 7. BCG monitoring system with embedded accelerometers or load cells (modified from Figure 5 in [30]).

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  Figure 8. BCG waveform. The time traces of the BCG acceleration signal in the longitudinal axis (y) for a healthy subject are shown together with the ECG signal in one heartbeat (in arbitrary units). BCG waves show the “F” to “N” waves, which are typical of BCG recordings [31].

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  Figure 9. The recording setup with the static charge-sensitive bed (SCSB) [36].

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  Figure 10. Camera-based temperature distribution monitor [45].

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  Figure 11. (Left) Radar installed in the room [48]; (Right) mm wave radar 24 FGHz Huan presence detection sensor.

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  Figure 12. Sleep quality monitors: from the left, Emfit, Sleeptracker, and NemuriScan.