Re-phrasing the question for better answers. In physiological signal monitoring, we use dry electrodes, wet electrodes and active electrodes. Active electrodes are good but often plagued with noises picked-amplified and transmitted to acquisition system. My question is what and how people who used active electrodes for physiological sensing like EEG/ECG tackled the noise issues.
You can try with diverses electrochemical techniques, like square wave voltammetry and differential pulse voltammetry, maybe you can down the signal to noise ratio. But this is in general case... I think that your question is very wide...
I agree with the former researchers and maybe you must "improve" your question.
Even so, you can minimize noises that appear in an electrochemical cell using a Faraday cage. Also, when microelectrodes and especially ultramicroelectrodes are used, the utilization of a current amplifier very close the electrochemical cell (preferentially inside the Faraday cage) is a way of minimizes noise. The utilization of instruments powered by batteries is also a way to eliminate the noise "conducted" by the electrical lines. Very important is have a real good ground line. In the past I saw a project where the signal was transmitted via optical fibers to avoid the introduction of metallic cables inside the Faradaic cage. These cables can actuate as an "antenna" to capture noises.
I would advise just the same for dry electrodes:
Shield your cables or your eeg headset ...
To shield your cables you need to sleeve them in a conductive material and connect the conductive shield to the ground pin of whatever eeg system you use ... another simple solution is to enclose your entire headset in a shield ... you can try with a good old strainer that you connect to the ground with aligator clips if you are in doubt ... You'll see how improved your signal becomes. (or just with some aluminum foil)
Usually, active electrodes should include a shield in their build ... so I'm surprised you face such noise problems. (I only have used dry or wet electrodes until now)
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Electrodes