Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Two types of gradiometer electrode configurations were investigated. On the left a first order gradiometer dual electrode design is shown and on the right a second order quad electrode design is illustrated. The areas of the electrodes in a given configuration are equal but the electrode aspect ratio a/b and spacing are variable.
