Electromagnetic 3D Motion Trackers

Electromagneic 3D Motion Trackers have many features that make them suitable for Biomechanics, Virtual Reality, Biomedical 3D Imaging, Sports Analysis, Behaviour Studies, Simulation and Avionics. Their features are listed below.
  1. Low Cost.
  2. No lighting conditions, background or line of sight constraints.
  3. No drift.
  4. 6 DOF data per sensor.
  5. Both wireless and wired models.
  6. Real-Time operation. Lowest latencies available in the market.
  7. Portable.
There are 2 types of Electromagnetic 3D Motion Trackers available:

Polhemus AC Electromagnetic Technology Motion Trackers:

Polhemus makes many models of motion trackers . Please see below:

Patriot, Patriot DB and Partriot Wireless:

Patriot and Patriot wireless are 2 sensor capablle, 6DOF Motion Trackers. it has 60 Hz sampling rate per sensor. Patriot is also available in PatriotDB Version, that has small Electronic Unit that goes in Optical Drive bay of computer. This has appliction in location based entertainment, Ergonomics, Stereotaxic Localization and Tool/Head Tracking for 3D Biomedical Simulation.
Patriot Brochure.pdfPatriot DB Brochue.pdf Patriot Wireless.pdf

Fastrak:


Fastrak is industry's old warhorse, 4 sensor capable, 6DOF Motion Tracker. it has 120 Hz aggreagte sampling rate . For 1 sensor, it offers 120 Hz, for 2 , 60 Hz, for 3 40 Hz, and for 4 sensors , effective sampling rate would be 30 Hz per sensor. Fastrak has been used for head and instrument tracking, 3D Biomedical imaging, Body tracking for Biomechanical analysis, Telerobotics and Computer Graphics since 1994.
Fastrak Brochure.pdf

Liberty and wireless Latus:

Liberty is state of the art, 16 sensor cpable, 6DOF Motion Tracker while Latus is 12 wireless markers capable, upto 16 receptor chennels to increase tracking range. Liberty offers 240 Hz sampling rate per sensor whereas Latus offers 188 Hz sampling rates per wireless marker for 
upto 8 markers and 94 Hz for upto 12 markers. Theese models are most versatile as fas as application is concerned, be it Sports Biomechanics, Gait Analysis, Virtual Reality, Behavior studies, Telerobotics , Simulation and much more.



G4:


THE 6DOF COMPACT, THREE-SENSOR WIRELESS TRACKER FOR COMPLETE FREEDOM OF MOVEMENT 

PRODUCT OVERVIEW 

G4 is a wireless motion tracking system that delivers full 6DOF (6 Degree-Of-Freedom) tracking, providing both position and orientation without hybrid technologies. Allowing the user complete freedom of movement, the entire system can be set up in minutes. As with all Polhemus tracking systems, G4 utilizes our proprietary AC electromagnetic technology. This means G4 tracks through most walls, as no line-of-sight is required for continuous tracking. Key features are highlighted below, see the G4 brochure for a complete description and product specifications. 

Watch the G4 product video to get a full overview of its capabilities. 

Add the PowerTRAK 360™ for a 3D handheld remote that delivers an unmatched level of superior tracking and precision accuracy.  



KEY FEATURES 

Wireless Tracking 
Tetherless tracking utilizes a wireless data transmitting system. Position and Orientation is sent wirelessly to the PC via RF links. Our proprietary technology tracks through walls—and people. 

10+ Hours of Battery Life 
Track in the field or in the lab all day, without having to start and stop because of battery life. The long-life battery is easily recharged via the wall charger. 

Portability 
The G4 system is compact and portable, and the system electronics unit (hub) can be belt worn. This allows you to change or move your tracking environment quickly. 

Auto Tracking 
Recognition The G4 system has auto tracking capability, meaning G4 will re-acquire the signal as a tracked subject walks back into the field of tracking range. 

Scalable 
The standard G4 system includes one hub, one source and one sensor. One of the most impressive features of G4 is the product can be scaled up to continue to meet your needs as they evolve. As your applications change or expand, you can add components to increase G4's capabilities. If you need to increase the number of people or objects being tracked, you can add up to nine hubs; increase the field of range by adding up to eight sources. 

APPLICATIONS 

Rehabilitation and Physical Therapy 
Biomechanics 
Sports Motion Analysis 
Training and Simulation .
Cave and Dome Environments 
Power Wall Applications 
Ergonomics Studies 
Human Factors Engineering



Accessories:

There are various accessories avialable for Motion Trackers above.

Sensors:
RX2: This is standard sensor for Patriot, Fastrak and Liberty Trackers. 

RX-1C: This is smal, flat sided sensor for small environment for Patriot, Liberty and Fastrak. 

RX-1D: This is small, tear drop shaped sensor for specific requirements.
MicroSensor: 
The Micro Sensor 1.8 is one of the latest breakthroughs from Polhemus, the leaders in motion measurement innovation. This 6DOF (6 Degree-Of-Freedom) micro sensor tracking element utilizes Polhemus proprietary AC electromagnetic technology, weighs in at less than a gram, and measures only 1.8 millimeters in OD (outer diameter). Small and lightweight, it packs an enormous amount of capability into its small size and provides both position and orientation data, at speeds up to 240 Hz (frames of data per second). 

Like all Polhemus tracking technology, the new Micro Sensor 1.8 requires no line-of-sight to continuously track its position and orientation. Better still, Polhemus sensors are completely embeddable into a variety of custom form factors, ideal for fitting inside a traditional catheter, a head-worn device, such as an HMD, simulated medical tools, or even slipped under gloves or clothing. This makes the Micro Sensor 1.8 an ideal tracking solution for applications requiring not only high-fidelity precision tracking, but also small-scale sensor size. 

View videos of the Micro Sensor 1.8 on our YouTube channel.

Currently for use with Polhemus  G4, LIBERTY™ and PATRIOT™ motion tracking systems, the Micro Sensor 1.8 offers tracking capabilities of up to 16 sensors simultaneously per system. Polhemus AC electromagnetic technology allows for multiple tuned magnetic tracking sources which enables you to run independent tracking systems right beside each other without concern for magnetic overlap (cross talk). Learn more about the Polhemus LIBERTY and PATRIOT tracking systems and get detailed information on accuracy, update rates and tracking system specifications.

Polhemus technology has been used in the healthcare market for years,
including healthcare simulation and real-world applications such as enabling image guided surgery. The Micro Sensor 1.8 adds new capability and value to healthcare and other important markets.

Above: Micro Sensor 1.8 inserted in catheter tubing and embedded in 3D heart model, finger and hand tracking with multiple sensors

KEY FEATURES 

Full 6DOF motion tracking (measures both position and orientation) 
1.8 millimeter OD (Outer Diameter) 
Embeddable, no line-of-sight required 
Highly precise and accurate 
Lightweight, sensor head weighs less than a gram 
Update rates as high as 240 Hz Track up to 16 sensors simultaneously, per system 

APPLICATIONS 

Healthcare simulation 
6DOF hand and finger tracking 
Head tracking (watch the video) 
Catheter applications 
Image guided surgical simulations/procedures Limb tracking (biomechanics) 
Research studies

Sources:
TX2: This is standard source with range of +/- 2.5 feet spherical tracking range around it.

TX1: This is small range source<img> with tracking range of +/- 1 feet. This is usefull for small range application where small sized source and minimum metal distortions of this source due to small electromagnetic field is required.
TX4: This 4" source has larger spehrical tracking range of +/- 4 feet.
Long Range Source: This is longest range source <img>with tracking range of +/- 7.5 feet.
Stylus/Wanda:
8" Stylus: This is 8" Stylus
to convert Patriot, Fatrak and Liberty Trackers into free form digitizer.
3" Stylus: This is smaller stylus<img> that can reach hard to reach crevices.
Wanda: This is a 3D Interaction device that can house a 6DOF sensor, for Vitual Environments and has 3 Programmable buttons.. 
Accessories Brochure.pdf