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LIBERTY 8/16
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The fastest, most accurate, scalable electromagnetic
tracker available, LIBERTY™ represents a quantum leap in new technology with up to 16 Sensors.
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State-of-the-art Digital Signal Processor (DSP) electronics make it the perfect real-time solution for six degree-of-freedom needs. LIBERTY has speed, ease-of-use via an intuitive Graphical User Interface (GUI), scalability, distortion sensing and improved signal to noise ratios which increase stability and resolution while providing consistent high quality data.
The Forerunner in Tracking Technology
LIBERTY incorporates an unprecedented speed of 240 updates per second per sensor,
the ability to upgrade from four sensor channels to eight or up to sixteen sensors by the addition of further circuit to the Liberty 240/16 boards and detection distortion, all the while providing the most accurate and consistent data. With the addition of the Polhemus Stylus, LIBERTY becomes a highly accurate 3D digitizer.
Easy, Intuitive User Interface
LIBERTY comes standard with Windows 2000/XP GUI and a comprehensive, easy to use
Software Developers Kit (SDK). The GUI allows four independent user definable profiles
for setting system parameters such as filtering, output formats, coordinate rotations and many
more. This is a valuable feature for multiple applications or users. For visualization, an
integrated motion box provides navigable points of view and can include text data. Additional
features include a data record/playback component, plus the capability to quickly export data
via Microsoft® “Named Pipe.”
A/C Magnetics: Increases Stability, Resolution, Speed and Range
Incorporating state of the art Digital Signal Processor (DSP) electronics in concert with A/C
magnetics provides the user with improved signal to noise ratios which increase range,
stability, resolution and speed. The system is essentially unaffected by facility power grids,
and update rates are always maintained, keeping up with the voluminous rate of tracking data
produced.
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Components
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LIBERTY includes a System Electronics Unit (SEU), one sensor and one source. You can easily expand the system by adding three additional sensors and with the factory installation of an additional circuit board, four more for a total of eight sensors.
Optional accessories include a longer range source, stylus and a variety of cable lengths for each sensor.
System Electronics Unit
Contains the hardware and software necessary to generate and sense the magnetic fields, compute position and orientation, and interface with the host computer via RS- 232 or USB.
Source
The source contains electromagnetic coils enclosed in a molded plastic shell that emit magnetic fields. The source is the system’s reference frame for sensor measurements.
Sensor
The sensor contains electromagnetic coils enclosed in a molded plastic shell that detect the magnetic fields emitted by the source. A lightweight, small cube, the sensors position and orientation is precisely measured as it is moved. The sensor is a completely passive device, having no active voltage applied to it.
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Features |
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Update Rate: LIBERTY tracks objects at a speed of 240 updates per second, all sensors simultaneously. Latency is less than 4ms.
Scalable: Four sensors are available on the base product, LIBERTY 240/8. With the addition of a further circuit boards inside the same chassis creates the Liberty up to an eight Sensor system. The LIBERTY 240/16 Flagship Tracking System, is capable to to be user upgradable for a total of sixteen sensor channels.
Communications Interface: LIBERTY comes standard with both an RS-232 serial interface and USB.
Distortion Sensing: Each sensor with LIBERTY is able to independently detect distortion within the environment, alerting the user to make appropriate changes if necessary.
Multiple User Definable Profiles: The GUI allows four independent user definable profiles for setting system parameters such as filtering, output formats, coordinate rotations and many more.
Multiple Output Formats: User may select position in Cartesian coordinates (English or metric); orientation in direction cosines, Euler angles or quaternions.
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Specifications |
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Latency
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3.5 milliseconds.
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Number of Sensors
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240/8 has 1 to 4(upgradable to 8), 240/16 has 1 to 4 (upgradable to 16)
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Update Rate
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240 Hz per sensor, simultaneous samples
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Interface
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USB; RS232 to 115,200 Baud, both standard
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Static Accuracy
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0.03 in RMS for X, Y or Z position;
0.15° RMS for sensor orientation
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Resolution
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0.00015 in (0.038 mm) at 12 in (30 cm) range;
0.0012° orientation
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Coverage/Range
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36 in. (90 cm) at above specifications; useful operation in excess of 72 in. (180 cm)
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Multiple Systems
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Provision available to operate two separate systems in same environment.
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Angular Coverage
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The receivers are all-attitude.
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Output Sync Pulse
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TTL frame sync output
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Data Format
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Operator selectable ASCII or IEEE 754 binary; English/Metric Units
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External Event Marker
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User input flag and output marker
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Physical Characteristics
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SEU w/power supply: 12.2 in. (31 cm) L x 7 in. (17.8 cm) W x 8.5 in. (21.6 cm) H; weight 9 lbs (4.1 kg)
Field Source: 2.3 in. (5.8 cm) L x 2.2 in. (5.6 cm) W x 2.2 in. (5.6 cm) H; weight 8.8 oz (250 gm)
Sensor: 0.9 in. (22.9 mm) L x 1.1 in. (27.9 mm) W x 0.6 in. (15.2 mm) H; weight 0.8 oz (23 gm)
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Power Requirements
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85-264 VAC, 47 – 440 Hz, single phase, 50 W
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Regulations
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FCC Part 15, class A, CE: EN50081-1, class A, emissions, EN50082-1, class 2, immunity, EN61010, safety
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Specifications subject to change without notice.
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Applications |
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Biomechanical and Sports Analysis
With an update rate of 240 Hz per sensor, LIBERTY can collect real-time relative data
from the speed of a golf swing, an athlete’s fast-paced movement or down-to-minute
differences of movement and rotations for gait or limb movement analysis.
Virtual Reality
From the beginning, Polhemus 3SPACE® systems have been the selected choice
for VR head and body tracking. LIBERTY does it all in real time.
Head Mounted Displays
Virtually eliminating all latency, LIBERTY is the highest quality solution for military,
VR and simulation applications.
Dimensional Archiving and Anatomical Measurements
With the use of the Polhemus Stylus, you can collect actual dimensions of artifacts,
archaeological items and museum sculptures, or compile measurements of anatomical
features, body volumes, joint relationships or body contours.
Haptic or Tactile Research
LIBERTY provides highly accurate position and orientation which makes it the perfect
tool for use with today’s extremely sensitive haptic or tactile devices.
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Software Drivers |
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Rhinoceros®
Rhinoceros is a registered trademark
of Robert McNeel & Associates
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Rhino software plug-in for the PATRIOT™, a 6DOF tracking
system, that when used in conjunction with the Polhemus stylus, turns the system into a hand-held, free-form digitizer.
Once PATRIOT digitizes an object, Rhino can create, edit,
analyze, and translate NURBS curves, surfaces, and solids in Windows®.
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LabVIEW™ Instrument Driver for LIBERTY™ and PATRIOT™ Tracking Systems - This instrument driver has been developed and tested with the latest revision of LabVIEW, v7.0.The same driver is used for both LIBERTY and PATRIOT.
Download NI LabVIEW Driver
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Linux™ Solution for LIBERTY and PATRIOT Tracking systems - Download the zip or tar file for your tracking system, readme files are included for easy installation. The source code for a sample Linux application is also provided.
Download Liberty.zip Download Liberty.tar
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