What is a Faraday Cage?
A Faraday Cage uses a conductive metal (usually aluminum or copper) to reroute electrical charges around any objects inside. It acts as barrier that neither lets electrical waves in or out. Faraday Cages have many applications (for example, preventing damage to sensitive electronic equipment from lightning strike, electromagnetic pulse, etc).
Using a Faraday Cage can improve measurement accuracy by reducing the level of background electrical noise. This is especially usefully if you do measurements in an electrically noisy area such an high density urban or industrial power systems.
Do I need Faraday Cage for measurements?
This depends on several factors:
what is being measured (usually the larger the object the greater potential for the background noise so useful for larger plant)
instrumentation (does it have built in noise reduction)
location (electrically quiet or noisy)
analysis (software can be used to filter some background noise)
We suggest an initial measurement without Faraday Cage and only build one if the level of background noise is significant compared to the signal you want to record.
How to make a Faraday Cage
A suitably sized metal enclosure/box can be converted into a Faraday Cage but it is often more convenient to make a new one from an old cardboard box. For step by step guide to making your own Faraday Cage please click here.
Example recordings with and without Faraday Cage
Click here for signals generated by slime (Physarum) tubes.
Click here for signals generated by plants.
For additional information on Faraday cage see link below: https://en.wikipedia.org/wiki/Faraday_cage