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Resistance depends where the two copper strips come in contact with the centered resistive material when the sensor is bent.
Kirlian photography at its basic level is a "high voltage" contact print photography. So to carry this further to answer your question, aside from charging the room to a high voltage, you would need a plate the size of the room to make the contact print. Whether that plate is a Transparent Discharge Plate (TDP) for standard camera or video, or insulated plate for film. But with the film plate you'd need film the size of the room too.
In general, to do larger parts of the body would require greater voltages and currents. This would make the Kirlian photography process less safe. A way around this would be to use a small transparent electrode that could be slowly ran across the body. If the person being scanned is in a pitch black room, with a camera focused on the person, shutter open, you may be able to paint a kirlian aura.
I don't understand what you mean.
The kit can be purchased here:http://www.imagesco.com/science/high-voltage/high_voltage_devices.htmlTo purchase the board alone you need to contact the supplier directly.
That's a good idea.
If you build this device, please let me know your results.
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These type of sensors that I know about including this one:https://www.sparkfun.com/products/8606Are resistive. The parameters to measure are changes in resistance in relationship to the degree of bending. With the DIY sensors the in-group variance will be greater than with the commercial sensors.
Please let me know which commercial bi-directional sensor you are referring too.
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It can, but it becomes easier for the two copper foils to touch and short the sensor out.
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Digital Kirlian Photography
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Technically you can use any conductive material such as aluminum foil. The difficulty is that it is difficult to solder to aluminum and without the conductive foil having a plastic laminate base the foil will deteriorate pretty fast when used.
Usually , yes.John