Sorry to post here but am running into a brick wall at trying to find out
something as simple as the resistivity and dielectric constant for skin!
Does anybody have a source? Need quick, please.
- Robert -
Hi Robert:
The skin resistivity and dielectric constant is NOT simple.
My reference is Reilly, Applied Bioelectricity from Electrical Stimulation
to Electropathology.
Resistivity varies with
body location;
wet/dry;
electrode contact area;
electrode contact perimeter;
uniformity of current distribution below the contact;
the kind of tissue below the skin (muscle, fat);
thickness of the corneum (outermost layer of dead skin cells);
duration of current;
activity of sweat ducts;
etc.
Having said this, here are some resistivity values in
kilohm-centimeters-squared for dry contacts:
Arm dc 100-1,000
Arm 1.5-10 Hz 600-1,200
Fingertip 0-1 Hz 120-130
Palm 30-65 Hz 60-80
While Reilly has information on skin capacitance, he has no information on
dielectric constant.
Best regards,
Rich
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