Abstract
We characterize the performance of a system based on a magnetoresistor array. This instrument is developed to map the magnetic field, and to track a dipolar magnetic source in the presence of a static homogeneous field. The position and orientation of the magnetic source with respect to the sensor frame is retrieved together with the orientation of the frame with respect to the environmental field. A nonlinear best-fit procedure is used, and its precision, time performance, and reliability are analyzed. This analysis is performed in view of the practical application for which the system is designed that is an eye-tracking diagnostics and rehabilitative tool for medical purposes, which require high speed (≥100 Sa/s) and sub-millimetric spatial resolution. A throughout investigation on the results makes it possible to list several observations, suggestions, and hints, which will be useful in the design of similar setups.
Highlights
Tracking methodologies based on magnetic field measurements have been widely studied in the past decades and find application in several areas, including low-invasivity medical diagnostics [1,2]
We report xy projections of five trackings obtained with correct (9P estimated), overestimated and underestimated m values, respectively: evident trajectory distortions occur, which go rapidly in excess of 1 mm
We have tested a new concept of an eye-motion tracker based upon a 8-sensor magnetic tracker and a small magnet
Summary
Tracking methodologies based on magnetic field measurements have been widely studied in the past decades and find application in several areas, including low-invasivity medical diagnostics [1,2]. The non-linear approach can be extended to more complex problems, as in the cases of multi-target tracking [7] or when operating in the presence of a background field, which is the case considered here The latter feature characterizes the device described in this work, because of two main reasons: firstly it makes possible to operate with small targets in the presence of Earth field without suffering of tracking distortions induced by the latter, secondly it allows the simultaneous tracking of the magnetic target with respect to the sensors and of the sensors with respect to the ambient field. The cylinder rotates around its axis which can be alternatively plain or threaded, as to produce circular or helix trajectories
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