An ultrahigh impedance electric potential sensor can remotely detect human respiration and heart signals in an unshielded environment.
May enable contactless vital sign monitoring in routine settings; leaves open clinical validation and accuracy in patients.
We describe the measurement of human electrophysiological and movement signals remotely from a seated subject. An ultrahigh impedance electric potential sensor, designed specifically to reject external noise, is used to measure the electric field at distances of up to 40cm from the surface of the body. The sensor is able to provide continuous data acquisition, at full sensitivity, without saturation by external noise sources. Respiration and heart signals are seen simultaneously and are separated using digital filtering techniques. All of the results reported were obtained in an open unshielded environment in close proximity to line operated computer equipment.
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Prance et al. (2008) studied this question.
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