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LIBERTY™

A quantum leap in 6 Degree-Of-Freedom tracking technology, LIBERTY is the fastest and most accurate electromagnetic tracker available. With scalable support for up to 16 sensors, it's the indisputable forerunner in tracking technology. State-of-the-art digital signal processor (DSP) electronics, an intuitive graphical user interface (GUI) and a host of the most advanced technical features available make LIBERTY the professional's choice hands-down.

Unprecedented Speed, Stability and Resolution

Exclusive advancements in digital signal processor technology have enabled Polhemus to develop the world's fastest tracker. LIBERTY tracks objects at a speed of 240 updates per second. Regardless of how many sensors are in use, the update rate remains constant, with LIBERTY outputting a clean data stream. For applications requiring less data, LIBERTY also has 120Hz update rate.

LIBERTY's blazingly fast 240Hz update rate makes it the perfect system for tracking high-speed events such as a golf swing or an athlete's fast-paced movement. For virtual reality applications, LIBERTY performs real time head and body tracking. With virtually no latency, LIBERTY is the highest quality solution for military and simulation applications.

LIBERTY's DSP technology works in conjunction with the system's AC magnetics to deliver improved signal-to-noise ratios. Increased range, stability and resolution are realized. LIBERTY offers remarkable accuracy of .03 RMS for X, Y and Z position and .15° RMS for orientation.

Designed for Ease of Use and Power

LIBERTY includes a streamlined and intuitive Windows® 2000/XP user interface that's stocked with useful tools. Four independent user-definable profiles allow setting system parameters such as filtering, output formats, coordinate rotations and more. This valuable feature makes LIBERTY the preeminent tracker for accommodating multiple users or applications. An integrated motion box provides navigable points of view for visualization and is also capable of displaying text data. Additional features include data recording and playback, plus rapid data exporting via Microsoft? Named Pipe.


Polhemus understands that creating groundbreaking solutions requires the right tools. That's why LIBERTY includes a comprehensive and straightforward software developer's kit (SDK). The SDK features API libraries that facilitate easy integration into custom applications.


LIBERTY connects to any PC via an RS-232 or USB connection. Within moments after unpacking the LIBERTY system, it will be up and running. LIBERTY's environmental calibration software allows rapid calibration.

Two Systems in One

The optional stylus expands LIBERTY's already robust capabilities by converting it into a 3D digitizer. With the stylus, you can collect dimensions of artifacts, archaeological items and museum sculptures, or compile measurements of anatomical features, body volumes, joint relationships or body contours. Capturing data with the ergonomically designed stylus is as simple as pressing a button.

Scalable to Meet Your Needs

Two different base LIBERTY systems are available to meet your needs and budget. The LIBERTY 240/8 system includes four sensor channels. Adding a circuit board to its chassis expands the system to 8 sensor channels. The LIBERTY 240/16 system also natively includes four sensor channels, but can be upgraded to 8, 12 or 16 channels within the same chassis.

LIBERTY includes a system electronics unit (SEU), one sensor and one source. Options such as additional sensors, a longer range source and a stylus are available.

Figures (a) and (b) show details of the sensor connection ports on the back of the LIBERTY chassis.

Polhemus LIBERTY 240/8
(a) LIBERTY 240/8
Polhemus LIBERTY 240/16
(b) LIBERTY 240/16
Advanced AC Technology

Polhemus pioneered AC motion tracking and has refined and perfected the technology through numerous generations. Unlike products based on pulsed DC technology, Polhemus trackers are not negatively affected by the earth's magnetic field, power outlets or electric motors. Because AC tracking is also more accurate and faster, it's clearly the superior choice. In fact, Polhemus originated pulsed DC technology, but chose not to pursue it because of performance shortcomings.

Each of LIBERTY's sensors can independently detect environmental distortion. The user is instantly alerted to make the appropriate changes as required. This advanced feature delivers the ultimate assurance: count on LIBERTY to get the job done right, every time.

There is no need to worry about maintaining a clear line-of-sight between the sensor and source. Unlike sonic or laser devices, LIBERTY is not affected by signal blocking and interference.

Specifications
Degrees-of-Freedom 6DOF
Number of Sensors 1-16
Update Rate 240 Hz per sensor
Static Accuracy Position 0.03in
Static Accuracy Orientation 0.15° RMS
Latency 3.5ms
Resolution Position at 30cm range 0.00015in 0.0004cm
Resolution Orientation 0.0012°
Range from Standard TX2 Source Up to 5 feet or 1.52 meters
Extended Range Source Up to 15 feet or 4.6 meters
Interface RS-232 or USB (both included)
Host OS compatability GUI/SDK 2000/XP