Oscillating Search Coil System (aka, Eye Coil)
A search coil system uses the principle of magnetic induction in a wire coil in a homogenous magnetic field system to measure the orientation of eye, head or other body parts. Head and eye positions, however, cannot be measured using a search coil system. Usually, due to the very small homogenous regions of coil frame systems, head movement has to be restricted with a head holder and/or bite bar since otherwise, head translations are interpreted as eye rotations in the final data due to the inhomogeneity of the magnetic field outside of the very center of the field frame. To measure eye movements without restricting head motion, a large homogenous magnetic field is needed. In the Boston Oscillating Search-Coil System (BOSS), this is done by using the ‘Merritt’ field geometry: the magnetic field system consists of 3 x 4 field coils that produce a homogenous region in three dimensions over a large area.
User Manual: https://docs.google.com/document/d/1Esk6Qgg9Vyszn7R8jXprkgnpaQ_4r9HAm2KOPEtfOes/edit?usp=sharing
Quick Start Instructions
BOSS Coil System Quickstart.pdf
Additional Data Collection Procedures
Janis's BOSS notes (November 28, 2016)
Data Analysis
Zhetuo's Presentation from 8/28/2018
System test
Data and reports on OPUS: //opus.cvs.rochester.edu/aplab/BOSSData/TestRecordings
Relevant Literature
See the OPUS folder RevolvingFieldMonitorDocumentation for more documentation
Haslwanter - 1995 - Mathematics of three-dimensional eye rotations.pdf: Available on OPUS - //opus.cvs.rochester.edu/aplab/RevolvingFieldMonitorDocumentation/For APLAB repository/RFM/References/Haslwanter1995 - Mathematics of three-dimensional eye rotations.pdf
The Maryland Revolving Field Monitor: Available on OPUS - //opus.cvs.rochester.edu/aplab/RevolvingFieldMonitorDocumentation/RFM Material/Articles/MRFM_Theory_of_Instrument_and_Processing_its_data.pdf
Synchronization / Clock Signal
BNC A,B,C seem to be the main coils (not search coils). Not sure what signal is on BNC D. Currently, it's unknown if there is a clock signal output on the circuit board.