FEATURES
- Real Time 3-D Measurements
- Automatic Search and Track
- Passive or Active Targets
- Sub-millimeter Resolution
- Large Track Volume
- Invisible, Eye Safe Operation
- Compatible with Stereo from StereoGraphics and Nuvision
- Plug and Play: No Adjustments or Alignment Needed
- Cost Effective
APPLICATIONS
- Head Tracking Stereo Displays
- Industrial Automation
- Laboratory Measurements
- Digitization of 3-D Objects
The DynaSight is a compact, self-contained sensor that measures the instantaneous three dimensional position of a passive target. The sensor uses embedded signal processing to automatically acquire and track the target in uncontrolled environments.
A central application involves tracking the human head for use with advanced interactive displays. To cue the sensor, an adhesive-backed disposable target, weighing less than ten milligrams, is placed on the stereo glasses. The wireless target does not obscure vision or interfere with activities.
People are conditioned by everyday experience to expect that head movements will result in changes to the visual perspective. Small changes in head position and orientation are often employed to provide spatial context and reveal obscured details. The dynamic perspective display is a technique for emulating this intuitive behavior on a computer graphics system. In such application, the perspective for displayed graphics is adapted in real-time to be geometrically appropriate for the instantaneous positions of the viewer's eyes.
When dynamic perspective is combined with stereoscopic viewing, the result is a real time hologram-like display that provides a virtual window into a computer generated environment. Dynamic perspective eliminates the perceived image warping associated with static stereoscopic displays. An additional benefit of using the head to tune the perspective is that the hands are free to edit or control the object being displayed.
In industrial and laboratory settings, the sensor can track factory containers or robot end effectors. Optional laser designation allows 3-D digitization to arbitrary points on non-cooperative objects. Calibration between multiple independent devices can be accomplished using a DynaSight to track the relative positions between targets mounted on these devices.
With the optional Active Target Adapter, the sensor can perform interleaved 3-D tracking for up to four tethered targets. This provides multi-target and six-degree-of-freedom (6 DOF) measurement capabilities for special applications and helmet tracking.
Technical Specifications
- Size: 18.6 x 14.5 x 3.9 cm (7.3 x 5.7 x 1.5 in)
- Operating Wave Band: Near Infrared
- Field of Regard: 75° Azimuth x 75° Elevation
- Measurement Latency: 9 to 28 milliseconds (Operating mode dependent)
- Lock-on Delay: 0.3 Second Typical
Measurement Update Rate:
- 65 Hz Maximum for Passive Targets
- 65 Hz Maximum for Active Targets
Operating Range:
- 0.1 to 1.5 meters for 7 mm Passive Target
- 0.3 to 4 meters for 25 mm Passive Target
- 0.6 to 5 meters for 50 mm PassiveTarget
- Up to 12 meters for Active Targets
Measurement Resolution:
- 0.1 mm Cross Range Typical*
- 0.4 mm Down Range Typical*
Absolute Accuracy:
- 2 mm Cross Range Typical*
- 8 mm Down Range Typical*
Electrical Interface:
- RS-232C With DB-9 Connectors
- Cable and DB-25 Adapter Supplied
Default Data Format:
- 8 Bytes per Measurement Update
- X, Y, Z in 16-bit Two's Complement Format
- 0.05 mm per Least Significant Bit
Power Requirement:
- North American Version: 14V AC @ .7 amp (Wall Transformer For 115V AC Supplied)
- International Power Option: 15V DC @ .7 amp (Adapter and Locale-Specific Power Cable Supplied)
Options and Accessories:
- International Power Option
- High Gain Passive Targets
- Omni-directional Passive Targets
- Active Target Adapter
- Active Target Arrays
*Measurement parameters are RMS values and are quoted for 7 mm target at 80 cm range under normal fluorescent room lights. Values will vary with operating range and target diameter, and to some extent with ambient illumination and target position in the field of regard. Measurement resolutions of 0.05 mm in three axes are achieved at 40 cm range, and resolution is significantly reduced at range extremes.
Three-dimensional measurements are reported in a Cartesian coordinate system with origin at the DynaSight sensor. The DynaSight sensor can be adapted to a wide variety of video display monitors. Threaded inserts are provided on the base of the sensor so that mounting accessories can be developed for unusual installations.
