Motion tracker

Aug. 7, 2002
The Nest of Birds motion tracker from Ascension Technology Corp.

The Nest of Birds motion tracker from Ascension Technology Corp., Burlington, Vt., features four pulsed-dc magnetic sensors that simultaneously track the location of arms, heads, bodies, or objects in real time. The four sensors each measure six degrees of freedom (position and orientation). The plug-and-play motion tracker also comes with a USB interface.

Magnetic tracking is preferred for measuring motion in computer graphics applications. Magnetic tracking has a number of advantages over mechanical, optical, and acoustic methods. For starters, it gives six-degrees-of-freedom tracking without limits in angular coverage. The sensing surfaces are small, ranging from 25 down to 5-mm square, and range of motion is unlimited with no mechanical or line-ofsight limits.

Two basic magnetic tracking methods are ac electromagnetic and pulsed dc. Ac and dc trackers respond differently to conductive metals such as stainless steel and aluminum. The dc approach is effective in environments with metal. Transmitting a magnetic field induces eddy currents in the metal, which interfere with the transmission of the tracker magnetic field, distorting position and orientation measurements.

The Nest of Birds is suitable for interactive broadband use such as virtual reality (VR), interactive gaming, and in CAVE environments.

Sponsored Recommendations

The entire spectrum of drive technology

June 5, 2024
Read exciting stories about all aspects of maxon drive technology in our magazine.

MONITORING RELAYS — TYPES AND APPLICATIONS

May 15, 2024
Production equipment is expensive and needs to be protected against input abnormalities such as voltage, current, frequency, and phase to stay online and in operation for the ...

Solenoid Valve Mechanics: Understanding Force Balance Equations

May 13, 2024
When evaluating a solenoid valve for a particular application, it is important to ensure that the valve can both remain in state and transition between its de-energized and fully...

Solenoid Valve Basics: What They Are, What They Do, and How They Work

May 13, 2024
A solenoid valve is an electromechanical device used to control the flow of a liquid or gas. It is comprised of two features: a solenoid and a valve. The solenoid is an electric...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!