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Optical Tracking Technology Explained
How does it work?
3D Localization and Position Tracking
3D localization technology, or 3D position tracking, is the motion capture of objects in the physical world. It refers to precisely measuring an object’s 3D position and orientation within a defined space relative to a known reference point. This is typically achieved by tracking six degrees of freedom (6DOF): three positional coordinates (X, Y, Z) and three angular coordinates (roll, pitch, yaw).
Accurate 3D localization enables real-time spatial awareness, allowing systems to determine not only where an object is, but also how it is oriented and moving within an environment. This capability is essential in applications such as robotics, industrial automation, medical navigation, and augmented reality, where precise positioning directly impacts performance and safety
Optical Tracking Technology
Optical tracking is a 3D localization method that uses two or more cameras to monitor a measurement space. Each camera is equipped with an infrared (IR) pass filter and a ring of IR LEDs that periodically illuminate the space with invisible, safe IR light.
PS-Tech systems use stereoscopic infrared cameras to detect reflective markers in 3D space. Each marker is triangulated in real time, enabling precise 6DoF tracking of tools, objects, or people. This passive marker approach ensures zero interference, ultra-low latency, and sub-millimeter accuracy — ideal for demanding applications.
| Technology | Drift | Noise Sensitivity | Multi-Object | Wireless |
|---|---|---|---|---|
|
Optical |
✅ |
✅ |
✅ |
✅ |
|
Magnetic |
❌ |
❌ |
⚠ |
⚠ |
|
Acoustic |
❌ |
❌ |
⚠ |
⚠ |
|
Gyroscopic |
❌ |
⚠ |
❌ |
✅ |
|
Mechanical |
✅ |
✅ |
❌ |
❌ |
Advantages of Optical Tracking
Compared to other tracking technologies such as magnetic, acoustic, gyroscopic, and mechanical systems, optical tracking offers several benefits:
Resilience to environmental noise: Less susceptible to interference from external conditions.
No drift: Optical systems avoid drift issues common in other technologies.
Simultaneous multi-object tracking: Track multiple objects within the measurement space.
Lightweight wireless devices: Optical systems allow for the use of lightweight wireless interaction devices.
| Feature | Bar Trackers | Multi-Camera |
|---|---|---|
|
Tracking Quality |
Fixed, precisely defined sensor geometry |
Variable geometry, setup-dependent accuracy |
|
Consistency |
Proprietary optimized calibration |
User-dependent calibration quality |
|
Stability |
Rigid structure, vibration-resistant |
Sensitive to movement and vibration |
|
Ease of Use |
Factory precalibrated, plug-and-play |
On-site calibration required |
Bar Trackers vs Multi-Camera Systems
At PS-Tech, we specialize in high-precision bar tracker systems designed for applications where reliability, stability, and measurement integrity are essential. These systems can be optimized under controlled, ideal conditions, ensuring maximum accuracy from the outset without the need for ongoing recalibration during use. This makes them particularly suitable for demanding industrial and metrology applications where consistency is critical.
The structural design and calibration philosophy behind bar trackers create measurable advantages over conventional multi-camera systems. Thanks to the extreme rigidity of the camera’s fixed position within the bar, measurement geometry remains inherently stable, resulting in significantly higher precision than what can be achieved with mounted or externally aligned camera setups. This rigidity minimizes sensitivity to environmental influences and eliminates many of the variables that typically affect multi-camera systems, leading to more predictable and reliable measurement outcomes.
PS-Tech Optical Tracking Systems
PS-Tech offers optical tracking systems for different ranges:
PST Pico – compact optical tracker for short-range setups
PST Base – mid-range optical tracker for simulation environments
PST Iris – long-range optical tracking system for large volumes
Explore the right solution for your application.
From fundamental principles to real-world implementation, PST trackers translate optical tracking technology into precise, stable, and dependable 3D measurement solutions.