• Prateek Kammili
• Yashas P Anur
• Sai Sirisha Kethari
• Vibha T G

The need of medical assistance around the world never decreases but in-fact it rises substantially with the increase in number of diverse diseases and increase in population. Cardiac and neural signals are the most important electronic signals in the human body which need to be monitored as they are critical-health indicators. The conventional electrodes which are also known as wet electrodes makes use of adhesive Ag/AgCl gel in between the electrode and the skin for better conduction. Even though they are used universally in clinical applications to obtain the ECG and EEG of an individual, they are known to be uncomfortable for long duration monitoring applications and cumbersome for mobile use. The alternates to the wet electrodes so as to solve its disadvantages are the dry-contact electrodes where the need for an electrolyte is inessential or the contactless electrodes where there is no electrical contact between the electrode and the skin. These electrodes have been around for quite a while but still are yet to be accepted for clinical use. The process of obtaining or acquiring the biopotential signals such as the ECG or the EEG is the same and the device used for monitoring one can be used to monitor the other with minor modifications. In this paper, we will be providing an insight into the advancements in non-contact electrodes. This paper will also address the issues faced with dry and non-contact electrodes and the methods used to overcome these issues such as the noise level in the ECG or the EEG waveform. The advantages and the disadvantages of using the said methodologies will be explored. Upon studying the work done in this field to improve the efficiency of devices using dry electrodes and contactless electrodes, it has been concluded that it is not just probable but entirely possible that these may be used in future instead of the wet electrodes with same level of efficiency.

Bio-Potentials; Capacitive Electrodes; Contact Electrodes; Contactless Electrodes; Dry Electrodes; Electrocardiography; Electroencephalography;

"Survey on Dry-Contact and Contactless Electrodes for Biopotential Signals", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.474-479, June 2019, Available :http://www.jetir.org/papers/JETIR1907R75.pdf

"Survey on Dry-Contact and Contactless Electrodes for Biopotential Signals", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp474-479, June 2019, Available at : http://www.jetir.org/papers/JETIR1907R75.pdf