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Polhemus Liberty
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Polhemus Liberty: 6 DOF magnetic tracking of up to 16 sensors.     Online:
 
theblurb
    'theblurb' is the promotional marketing literature provided for this product.

Polhemus 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.

Polhemus Liberty: the perfect real-time solution for six degree-of-freedom needs.
Polhemus Liberty

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.

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.

Features:
  • Update Rate LIBERTY tracks objects at a speed of 240 updates per second, all sensors simultaneously. Latency is less than 4ms.
  • ScalableFour sensors are available on the base product, LIBERTY 240/8-4. The addition of a single circuit board inside the same hassis creates the Liberty 240/8-8, for a total of eight sensor channels. Alternativly the LIBERTY 240/16-4 can be upgraded to 8, 12 or 16 sensors.
  • 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.
  • 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
  • thefacts
        'thefacts' is the simple factual description of the product provided for you by our technical experts.

    Polhemus Liberty

    sPECS
        Detailed product specifications.
    Spec product_mocaptrack_polhemus_liberty Polhemus Liberty
    Degrees of Freedom 6
    Number of sensors 1-16
    Update Rate 240 Hz per sensor
    Static Accuracy Position 0.03in
    Static Accuracy Orientation (°RMS) 0.15
    Latency 3.5ms
    Static Resolution Orientation (°RMS) 0.0012
    Resolution Position at 30cm range 0.00005 in 0.00013 cm
    Resolution Orientation 0.0004
    Range from Standard TX2 Source Up to 5 feet or 1.52 meters
    Transmitter Dimensions (cm) 5.8x5.6x5.6(250g)
    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
    prices
        Up-to-date price lists in your preferred currency.
    Model USD
    product_mocaptrack_polhemus_liberty Liberty - 240/8-4 (8 input base unit with 4 inputs installed, 1 sensor supplied more can be added by ordering additional sensors)
    $ 13,005
    product_mocaptrack_polhemus_liberty Liberty - 240/8-8 (8 input base unit with 8 inputs installed, 1 sensor supplied more can be added by ordering additional sensors)
    $ 15,618
    product_mocaptrack_polhemus_liberty Liberty - 240/16-4 (16 input base unit with 4 inputs installed, 1 sensor supplied more can be added by ordering additional sensors)
    $ 21,140
    product_mocaptrack_polhemus_liberty Liberty - 240/16-8 (16 input base unit with 8 inputs installed, 1 sensor supplied more can be added by ordering additional sensors)
    $ 24,720
    product_mocaptrack_polhemus_liberty Liberty - 240/16-12 (16 input base unit with 12 inputs installed, 1 sensor supplied more can be added by ordering additional sensors)
    $ 28,300
    product_mocaptrack_polhemus_liberty Liberty - 240/16-16 (16 input base unit with 16 inputs installed, 1 sensor supplied more can be added by ordering additional sensors)
    $ 31,879
    FAQs
        If you have not found the info you want above, try here.
     q   I have never used HyperTerminal in Windows before. Can you explain how to make it work?
     
     a   You will need to set up the LIBERTY system according to the manual. Be sure to use a null modem cable for the RS 232 connection. Once this is completed, open the serial connection using the Windows program HyperTerminal.

    Here is a quick set up:

    *Click Start, point to Programs, Accessories and click HyperTerminal.
    *Double-click the HyperTerminal.exe icon.
    *Enter a session name, choose an icon and click OK.
    *In the “Connect using” field, select Com1 or Com2 (depending on your port connection) and click OK.
    *In the “Bits per Second” field select 115K.
    *In the “Data bits” field select 8 (default).
    *In the “Parity” field select None (default).
    *In the “Stop Bits” field select 1 (default).
    *In the “Flow Control” field select None and click OK.

    This and more detailed information can be found in the LIBERTY User’s Manual Section 1 “Getting Started"
     q   Why does it appear that I am missing data when I am collecting continuous data?
     a   The LIBERTY is a high speed data collection system. It continually collects and processes data from all connected sensors at 240 Hz. In the standard ASCII mode - with position and orientation being output - a RS-232 port only has enough bandwidth to output one sensors worth of data. If another sensor is connected to the LIBERTY then the next data collection cycle will be completed before the data from the previous frame is finished transmitting across the RS-232. The output buffer is a finite size so eventually data will be over written. The binary mode will reduce the amount of data that needs to be sent, but still no more than two sensors worth of data can be transmitted without losing data.
    Even using USB, the ability to collect continuous data at 240 Hz without losing information will be dependent on the capability of the host computer and the processing load on the host computer’s operating system. There are several layers of software that the USB data must go through from the hardware port until the data arrives at the User’s application in a Windows™ based system. Understanding the processing load on the host computer is critical in developing an application to collect data uninterrupted.
     q   Sometimes when I am taking data with my LIBERTY the X data is not accurate and the Y and Z signs change. What causes this?
     a   The most common reason for this phenomenon is that the receiver has probably moved into a different hemisphere relative to the transmitter. The LIBERTY system is defaulted in a +X hemisphere which means that the system data will be “correct” in this hemisphere only. Note: The +X hemisphere is the side of the transmitter opposite from where the cable comes out of the transmitter shell. Section 3.1.2.1.2 of the LIBERTY Users Manual explains the different hemisphere options.
     q   Why is it that sometimes my measurements do not make sense? For example, why does the measurement for Z change when I move steadily forward in X?
     a   The system is probably being affected by the presence of metal objects in the test environment. Since the system uses electro-magnetic technology, the presence of metal can cause distortion and prevent the system from calculating accurate measurements. This distortion can be caused by such things as metal desks, filing cabinets, or metal reinforcement in walls, floors, ceilings, tables and chairs. Check the condition of the LED on the front panel. It should be solid green. If the LED is flashing green/red or if it is solid red, then the system is detecting a marginal or poor magnetic signal. Action should be taken to reduce the distortion interference. Section 4.1.3 of the User Manual discusses the distortion sensing ability of the LIBERTY system.
     q   What can I do to reduce the inaccuracies caused by metal distortion?
     a   The best solution is to find a larger room that will allow the user to locate the transmitter and receiver farther away from metal objects. You may also try experimenting by moving the transmitter and receiver to different parts of the room, which are further away from metal. To prevent distortion interference, the general rule of thumb is two to three times the separation distance between the transmitter and receiver. For example, if the separation distance is one foot, metal within three feet of the transmitter or receiver may cause distortion and inaccurate measurements.
     q  How do I know if metal in my test environment will affect the accuracy of my tracker?
     a   The LIBERTY is equipped with a distortion detection algorithm. The LED on the front panel indicates the condition of the measured magnetic signal. If the LED is flashing green/red or if it is solid red, then the system is detecting a marginal or poor magnetic signal. Section 4.1.3 of the User Manual discusses the distortion sensing ability the LIBERTY system.
     q   Can I connect more than one stylus to the LIBERTY?
     a  Yes. Each input of the LIBERTY can be used with a stylus. Section 3.1.2.1.10 of the User’s Manual discusses the stylus operation.
     q  How can I synchronize to my LIBERTY system?
     a   The LIBERTY is a free running, frequency multiplexed system. The “Sync Out” signal created by the LIBERTY system (indicates the end of a data cycle) can be used to lock external equipment to the LIBERTY’s data collection cycle. The “Sync In” can also be used to mark the data frame so the time of a particular event can be matched to data cycle. Section 4.1.4 of the LIBERTY User’s Manual details the external sync I/O feature.
     q   What kind of an update rate can I expect to receive from my LIBERTY
     a   The LIBERTY has a continuous 240 Hz update rate no matter how many sensors are used. The update rate can be set to 120 Hz. (see section 3.1.2.1.15 in the User’s Manual).
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