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Non-invasive Human Body Electrophysiological Measurements using Displacement Current Sensors
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posted on 2023-06-08, 05:39 authored by C J Harland, T D Clark, Robert PranceWe describe the displacement current (electric potential) sensor for use in the non-invasive detection of human body electrical signals. The sensor, based on commercially available electrometer amplifiers, operates by monitoring the displacement current (effectively an electric field changing with time) between the body and the sensor input electrode. By adopting various electronic feedback techniques, combined with bias and stabilization circuits, we have been able to greatly enhance the input impedance and sensitivity of these amplifiers compared with the standard electrode systems in use today. In our current systems input impedances are typically 10-15¿, with a minimum noise floor of 30nV/vHz at 1Hz. With this capability these sensors can be used to record body electrical signals remarkably well. Furthermore, since no real charge current is required for these sensors to function, we are able to dispense with the usual electrolytic paste contact to the surface of the body. As a consequence displacement current sensors are perfectly bio-compatible. In this paper we provide several applications of these sensors, in particular to the ECG and EO.
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Publication status
- Published
Presentation Type
- paper
Event name
1st International Workshop on Wearable and Implantable Body Sensor NetworksEvent location
LondonEvent type
conferenceDepartment affiliated with
- Engineering and Design Publications
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- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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