Key result
A capacitive sensor using a Colpitts oscillator successfully detected heartbeat and respiration without direct skin contact by measuring precordial movement-induced capacitance changes.
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A capacitive sensor with a Colpitts oscillator can detect human heartbeat and respiration without direct skin contact.
A capacitive sensor for detecting the heartbeat rate of a human without direct contact with the skin is investigated. Precordial movement changes the capacitance between patch electrodes and modulates the frequency of a Colpitts oscillator. Heartbeat and respiration information can be obtained by demodulating the oscillating signal. Heartbeat signal obtained by bandpass filtering the harmonics of heartbeat frequency is separated from the demodulated signal.
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Oum et al. (2008) studied this question. Capacitive sensor with Colpitts oscillator was evaluated on Heartbeat and respiration detection. A capacitive sensor using a Colpitts oscillator successfully detected heartbeat and respiration without direct skin contact by measuring precordial movement-induced capacitance changes.
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