Hello AACers,
I am trying to construct a Faraday Cage to protect my EEG recordings from 60Hz noise, but I am not getting good results. I am using copper mesh screening and a gasketed conductive seal on the door, but I'm not getting much attenuation of signal inside my cage. Commercial manufacturers recommend copper screen for this type of application, so I thought I'd build my own. The amount of 60Hz noise is exactly the same if the door is open or closed! I'm a newbie to these forums, and not an EE, so please be gentle in your comments...
I think the problem must be in the seams between the mesh, but I don't understand what the problem is. I've included an image that shows the way that I've constructed the connection point between the seams, with two possible problems in the construction. Could you please tell me which is more likely to be the problem?
A: The two pieces of screen are connected via pressure (sandwiched between two pieces of wood). It is possible that there is not a good connection at each point, because the wood might not be perfectly square. I could use conductive tape to seal the seams (I don't know how to solder!).
B: The sandwiching between wood is somehow incompatible with a Faraday Cage. I understand that a Faraday Cage works by having a continuous surface, but I couldn't figure out how to keep the mesh up without sandwiching between a wood frame. Will having a protrusion from the continuous surface eliminate the Faraday Cage effect (and if so, could you explain why or point me to resources on constructing a cage?).
Thanks for your help!
nbc2016
I am trying to construct a Faraday Cage to protect my EEG recordings from 60Hz noise, but I am not getting good results. I am using copper mesh screening and a gasketed conductive seal on the door, but I'm not getting much attenuation of signal inside my cage. Commercial manufacturers recommend copper screen for this type of application, so I thought I'd build my own. The amount of 60Hz noise is exactly the same if the door is open or closed! I'm a newbie to these forums, and not an EE, so please be gentle in your comments...
I think the problem must be in the seams between the mesh, but I don't understand what the problem is. I've included an image that shows the way that I've constructed the connection point between the seams, with two possible problems in the construction. Could you please tell me which is more likely to be the problem?
A: The two pieces of screen are connected via pressure (sandwiched between two pieces of wood). It is possible that there is not a good connection at each point, because the wood might not be perfectly square. I could use conductive tape to seal the seams (I don't know how to solder!).
B: The sandwiching between wood is somehow incompatible with a Faraday Cage. I understand that a Faraday Cage works by having a continuous surface, but I couldn't figure out how to keep the mesh up without sandwiching between a wood frame. Will having a protrusion from the continuous surface eliminate the Faraday Cage effect (and if so, could you explain why or point me to resources on constructing a cage?).
Thanks for your help!
nbc2016
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