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Non-contact heartbeat and respiration detector using capacitive sensor with Colpitts oscillator

Non-contact heartbeat and respiration detector using capacitive sensor with Colpitts oscillator

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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.

Inspec keywords: pneumodynamics; capacitance; cardiology; biomedical engineering

Other keywords: noncontact respiration detector; precordial movement; capacitance; capacitive sensor; Colpitts oscillator; noncontact heartbeat detector

Subjects: Electrodiagnostics and other electrical measurement techniques; Bioelectric signals; Haemodynamics, pneumodynamics

References

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      • I. Korhonen , J. Parkka , M.V. Gils. . Health monitoring in the home of the future. IEEE Eng. Med. Biol. Mag. , 66 - 73
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      • M. Ishijima. . Monitoring of electrocardiograms in bed without utilizing body surface electrodes. IEEE Trans. Biomed. Eng. , 6 , 593 - 594
    3. 3)
      • Lin , C. James . Microwave apexcardiography. IEEE Trans. Microw. Theory Tech. , 6
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