im.ve lab
VR Equipment
imveL
Our L-Shaped immersive projective VR system.
The installation described in the following is our former system. Since 2009, we use an active stereo setup. The screen setup and tracking technology used did not change.
The L-Shape is a passive projection system composed of 4 projector, 2 on each of the project surfaces. The wall is a special project surface which handles polarized light properly and is a rear project setup. The floor is also a special surface to reflect the polarized light correctly, and is front projection. The imveL uses circular polarization. The floor is 2.25m x 3.0m and adjoins the project wall, which is 3m x 2.04m.
|
|
|
|
|
|
The imveL additionally includes a stereo surround sound system including subwoofer. Additionally the floor of the system incorporates a specially developed "sound floor" which allows low frequency virbrational feedback to be given to the user.
|
|
|
The imveL is currently setup to use the ARTrack2 tracking system for tracking of users and input devices. This system uses infra-red cameras, which track retro-reflective markers. In the current setup four cameras are used, placed at the
corners of the project wall.
Tracking Devices
ARTtrack2 - infrared optical tracking
Description:
ARTtrack2 is the best solution for smaller measurement volumes.
With its compactness ARTtrack2 fits well into volume limited applications. It can be operated directly with a 12 V DC source.
Technical Specifications:
| Measurement Principle | |||||
| infrared optical tracking camera, to work with passive or active markers | |||||
| integrated pattern recognition unit | |||||
| IR source | |||||
| built-in IR LED flash, wavelength 880 nm | |||||
| flash energy adjustable in 8 steps (controlled by software DTrack) | |||||
| Performance | |||||
| frame rate | max. 60 fps (adjustable) | ||||
| working distance | up to 4 m with passive markers, depending on marker size | ||||
| max. of 6DOF targets (60 fps, simultaneously) | 20 (fast mode), depending on marker size / 3 (accurate mode), depending on marker size | ||||
| Field of View (FoV) | |||||
| focal lengths 3.5 mm | horiz: 72.8 deg, vert: 58.2 deg | ||||
| focal lengths 4.5 mm | horiz: 57.9 deg, vert: 45.3 deg | ||||
| focal lengths 6.0 mm | horiz: 42.9 deg, vert: 33.0 deg | ||||
| focal lengths 8.0 mm | horiz: 33.9 deg, vert: 25.8 deg | ||||
| focal lengths 12.0 mm | horiz: 22.2 deg, vert: 16.8 deg | ||||
| Cable Connections | |||||
| synchronization | BNC, 75 Ω | ||||
| data out | 100 Mbit/s ethernet, twisted pair | ||||
| Power Supply | |||||
| voltage | 12 Volt (external power supply 100-240 Volt, 50-60 Hz) | ||||
| power consumption | approx. 15W | ||||
| Dimensions | |||||
| size | 109 mm x 78 mm x 120 mm | ||||
| weight | 0.96 kg | ||||
⇒ Back To Top ⇒ To Lab Homepage
Polhemus Liberty - electro-magnetic tracking system
|
|
|
Description :
The fastest, most accurate, scalable electromagnetic tracker available, LIBERTY™ represents a quantum leap in new technology. 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.
LIBERTY incorporates an unprecedented speed of 240 updates per second per sensor, the ability to upgrade from four sensor channels to eight by the addition of a single circuit board 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.
Technical Specifications:
| Update Rate (per sec) | 240 (per sensor) |
| Angular Range (°) | all |
| Latency (ms) | 3.5 |
| Operating Temperature (min) (° C) | 10 |
| Operating Temperature (max) (° C) | 40 |
| Operating Voltage (V) | 85-264 |
| Cable Length (M) | 3.048 or 6.096 (optional) |
| OS | 2000/XP |
| Hardware | PC |
| Software | SDK,Windows GUI |
| Interface | RS232/USB (both included) |
| Degrees of Freedom | 6 |
| Number of sensors | 1-8 |
| Range from transmitter (m) | 1.8 (± (optimal to 0.9)) |
| Extended range transmitter | 1.26-2.52 (40% extended) |
| Static Accuracy Position (cm RMS) | 0.0762 |
| Static Accuracy Orientation (° RMS) | 0.15 |
| Static Resolution Position (cm RMS) | 0.0004 |
| Static Resolution Orientation (° RMS) | 0.0012 |
| Distorted by Metallic Objects | yes |
| Sensor Dimensions (cm) | 22.9x27.9x15.2(23g) |
| Battery/Power Dimensions (cm) | N/A |
| Transmitter Dimensions (cm) | 5.8x5.6x5.6(250g) |
| Electronics Unit Dimensions (cm) | 31x17.8x21.6(4.1Kg) |
⇒ Back To Top ⇒ To Lab Homepage
Polhemus Patriot - electro-magnetic tracking system
Description:
PATRIOT is the leading cost-effective solution for 6 Degree-Of-Freedom tracking and 3D digitizing. It's an expandable system that can accommodate up to two sensors, making it perfect for a wide array of applications. From head tracking, biomechanical analysis and computer graphics to cursor control and stereotaxic localization, PATRIOT delivers a sweet spot combination of performance and value.
PATRIOT provides dynamic, real-time measurements of position (X, Y and Z Cartesian coordinates) and orientation (azimuth, elevation and roll). PATRIOT can update data continuously, discretely (point by point), or incrementally. With the optional stylus, you can trace the outline of a physical object or collect polygon facets and get pinpoint accuracy of unlimited X, Y and Z data points.
Technical Specifications:
| Degrees-of-Freedom | 6DOF |
| Number of Sensors | 1-2 |
| Update Rate | 60Hz per sensor |
| Static Accuracy Position | 0.1in RMS |
| Static Accuracy Orientation | .75 ° RMS |
| Latency | 17ms |
| Resolution Position at 30cm range | 0.0015in/0.0038cm |
| Resolution Orientation | 0.1° |
| Range from Standard TX2 Source | Up to 5 feet or 1.52 meters |
| Extended Range Source | n/a |
| Interface | RS-232 or USB (both included) |
| Host OS compatability | GUI/SDK 2000/XP |
⇒ Back To Top ⇒ To Lab Homepage