Electromagnetic tracking: Difference between revisions
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==Principles of operation== | ==Principles of operation== | ||
A field generator contains three orthogonal transmitter coils driven sequentially (AC systems) or in short pulses (pulsed-DC systems). Each receiver holds three orthogonal pick-up coils. As every axis is energized, the induced voltages encode the local magnetic-field vector; an over-determined least-squares solve yields 3-D position and orientation. | A field generator contains three orthogonal transmitter coils driven sequentially (AC systems) or in short pulses (pulsed-DC systems). Each receiver holds three orthogonal pick-up coils. As every axis is energized, the induced voltages encode the local magnetic-field vector; an over-determined least-squares solve yields 3-D position and orientation.<ref>Ascension Technology Corp. “Pulsed DC Magnetic Tracking Technology Overview.” White paper, 2003.</ref> | ||
For an ideal magnetic dipole the far-field magnitude decays with the inverse cube of distance (|B| ∝ 1/''r''³), sharply limiting working volume.<ref>Jackson J.D. ''Classical Electrodynamics'', 3 rd ed. Wiley (1998) p. 181.</ref> | For an ideal magnetic dipole the far-field magnitude decays with the inverse cube of distance (|B| ∝ 1/''r''³), sharply limiting working volume.<ref>Jackson J.D. ''Classical Electrodynamics'', 3 rd ed. Wiley (1998) p. 181.</ref> | ||