Fastrak
The Polhemus Fastrak system uses electromagnetic fields to track the position of up to four sensors. The electromagnetic field is generated by a stationary transmitter, and the position (X,Y,Z) and orientation (RX,RY,RZ) of the electromagnetic receivers can be tracked within this field.
Because Fastrak is an electromagnetic based system the presence of strong magnetic fields or metal objects can lead to measurement errors. Another limitation of the system is the range of the transmitter and the trailing receiver wires, making this system less suitable for large scale movements e.g. walking or running.
Within bounds of these limitations the Fastrak system is very versatile and has been extensively used in the literature to investigate a range of kinematic issues. Examples include the movement of the spine (lumbar, thoracic and cervical spine), shoulder, elbow and the knee joints.
Example article:
doi:10.1016/j.math.2009.05.009
Technical
Polhemus, 40 Hercules Drive, P.O Box 560, Colchester, VT, USA
www.polhemus.com
SYSTEM SPECIFICATIONS:
Frequency: 120Hz (to be split by number of sensors e.g. 120Hz for 1 sensor, 60Hz for 2 sensors, 40Hz for 3 sensors, 30Hz for 4 sensors)
Static Accuracy: 0.8mm RMS for XYZ position, 0.15° RMS orientation
Sensor Dimensions: 28.3mm by 22.9mm by 15.2mm
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