On bio activity related signals from contactless electrode measurements
Cita com:
hdl:2117/102332
Tipus de documentArticle
Data publicació2016-02-01
Condicions d'accésAccés obert
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Abstract
In a recent paper on a displacement current sensor for contactless detection of bio-activity
related signals [1], it was stated that “A potential means for human presence detection…is via
sensing…human biopotentials” [because] “physiological events associated with the biological
functions of many human organs produce electric fields,” and that “the ECG is relatively easier
to measure compared to other biopotentials and, hence, can potentially provide an important
[underscore added] means of detection of human presence.”
Contactless biopotential measurement using off-body electrodes has attracted many authors that
have proposed various solutions, some of which are far more expensive than that devised in [1].
Usually, one or two aluminium discs at a few centimetres from the chest are connected to a
high-impedance voltage amplifier and the large impedance between these electrodes and ground
makes the circuit very susceptible to capacitive (electric-field) interference hence it requires
electric shields or driven guards. Measuring displacement current instead of electrode voltage in
contactless biopotential measurements, as proposed in [1], avoids high impedance nodes hence
measurements should be far less susceptible to electric field interference. Consequently, it is
stated in [1] that “[Contactless] capacitive sensors therefore can be used to sense the
displacement current induced by the time-varying electric fields associated with various human
biopotentials.” This is in principle an interesting approach worth being considered and the
authors deserve praise for that.
CitacióPallàs-Areny, R., Casas, J. On bio activity related signals from contactless electrode measurements. "Sensors and actuators A. Physical", 1 Febrer 2016, vol. 238, núm. 1, p. 249-250.
ISSN0924-4247
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S0924424715302739
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