MEMS-Driven Laser Beam Scanning LiDAR: The Future of Variable Spatial Resolution Sensing and Foveated Ranging
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The document discusses the advancements and applications of MEMS-driven laser beam scanning LiDAR technology, highlighting its capability for variable spatial resolution sensing and foveated ranging. It presents the functionality of 3D depth sensors, detailing how they measure distance using time-of-flight principles to generate accurate depth maps. Additionally, the document emphasizes the benefits of this technology, including cost-effectiveness, high resolution, and adaptability for various applications.
MEMS-Driven Laser Beam Scanning LiDAR: The Future of Variable Spatial Resolution Sensing and Foveated Ranging
- 1. Don’t just think outside the box. See outside the box. MEMS-Driven Laser Beam Scanning LiDAR: The Future of Variable Spatial Resolution Sensing and Foveated Ranging LDC2-2, LDC 2018, Yokohama, Japan, April 24, 2018 Jari Honkanen (Jari_Honkanen@MicroVision.com) (https://www.linkedin.com/in/jarihonkanen)
- 2. 2 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 MEMS-Driven Laser Beam Scanning: One Platform, Multiple Applications
- 3. MEMS-Driven Laser Beam Scanning (LBS) Technology
- 4. 4 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 SLOW SCAN AXIS (Vertical） FAST SCAN AXIS (Horizontal） MEMS = Micro Electro Mechanical System Coil Mirror Φ1.2mm PicoP® Laser Beam Scanning - MEMS
- 5. 5 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 Laser Beam PicoP® Laser Beam Steering
- 6. 6 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 MICROVISION, INC. COPYRIGHT 2013. ALL RIGHTS RESERVED. Vertical Trajectory: Drive vs. Time Generation of Raster Pattern Horizontal Trajectory: Drive vs. Time Single drive input contains both Slow Scan Ramp and Fast Scan Sinusoidal drive signals PicoP® Laser Beam Scanning – MEMS Actuation
- 8. 8 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 3D Depth Sensor – what is it? 3D sensors allow devices to observe the environment in 3 dimensions 3D imagers measure distance for every pixel within detection field. Number of measurements within detection field of view Depth Sensor/Imager X Y Distance, Z Depth Map Point Cloud 3D imagers produce a 2D addressable array, a depth map, or further a 3-dimensional collection of points, a point cloud
- 9. 9 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 2D MEMS Mirror IR laser IR Photodetector MEMS-Driven Laser Beam Scanning LiDAR 3D Sensor • X,Y location of object known because of knowledge of MEMS pointing angle. No computation required. • Z determined by Time-of-Flight: Z = ½ * c * tTOF IR Photodetector can be: • PIN Photodiode • Silicon Photomultiplier (SiPM) • Avalanche Photodiode (APD)
- 10. 10 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 3D Depth Sensing Key Performance Metrics zmeasured zactual Δz y (#rows) V◦ H◦ zmeasured zactual Metric Symbol Measure Spatial Resolution x * y # of points Field of View H◦ * V◦ degrees Angular Resolution h◦=H◦/x * v◦=V◦/y degrees Range z distance Frame Rate fps # per second Precision Δz % deviation Accuracy |zmeasured – zactual| % error
- 11. MEMS-Driven LBS LiDAR Performance Controls
- 12. 12 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 MEMS-Driven LBS LiDAR Performance Controls Metric Symbol Measure Spatial Resolution x * y # of points Field of View H◦ * V◦ degrees Angular Resolution h◦=H◦/x * v◦=V◦/y degrees Range z distance Frame Rate fps # per second Precision Δz % deviation Accuracy |zmeasured – zactual| % error Variable, Dynamically Programmable Variable, Dynamically Programmable
- 13. 13 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 time y 2 * y Vertical Resolution vs. Frame Rate Vertical Trajectory (Frame Rate) Vertical Resolution
- 14. 14 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 IR laser Dynamic Programmable Resolution and Frame Rate IR Photodetector IR laser IR Photodetector IR laser IR Photodetector 128×720 @60Hz 256×720 @30Hz 384×720 @20HzReturn delay + Analog chain relaxation time
- 15. 15 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 time Δv1 ◦ Δv2 ◦ Vertical Angular Resolution vs. Field of View Vertical Scan Angle (Field of View) Vertical Angular Resolution V1 ◦ V2 ◦
- 16. 16 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 Δh◦ H1◦ Δh◦ H2◦ Horizontal Angular Resolution vs. Field of View Horizontal Scan Angle (Field of View) Horizontal Angular Resolution
- 17. 17 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 Uniform laser pulse positioning Staggered laser pulse positioning Horizontal Resolution vs. Vertical Resolution 128×720 @60Hz 512×180 @60Hz
- 18. 18 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 time Uniform scan line spacing & vertical resolution Variable scan line spacing & vertical resolution Dynamic 1D Foveated Ranging Vertical Trajectory
- 19. 19 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 1 2 3 1 2 3 Optical bandpass filter (Each PD sensitive to 1 λ) MEMS-Driven LBS High-Definition LiDAR IR Laser Diodes 2D MEMS Example IR λs: 830 nm, 885 nm, 940 nm IR Photodiodes Detect 2048×1080 @ 7.5Hz 384×720 @ 60Hz
- 20. 20 MICROVISION, INC. COPYRIGHT 2018. ALL RIGHTS RESERVED.1/21/2020 Conclusion: MEMS-Driven Scanning LiDAR Benefits Cost Effective (Re-uses mature LBS technology) Enables use of multiple and redundant sensors High Resolution (~5.5M – 16.5M points/sec) Ability to resolve small features Small Size (Thin) Enables new class of form factors Dynamic (Programmable Resolution and Frame Rate) Adapt latency and fidelity to the application or use case
- 21. DON’T JUST THINK OUTSIDE THE BOX. SEE OUTSIDE THE BOX. © 2018 MICROVISION, INC. ALL RIGHTS RESERVED. PICOP IS A REGISTERED TRADEMARK OF MICROVISION, INC. ALL OTHER TRADEMARKS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS.