Construction and Calibration of a Low-Cost 3D Laser Scanner with 360º Field of View for Mobile Robots
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1 Construction and Calibration of a Low-Cost 3D Laser Scanner with 360º Field of View for Mobile Robots Jorge L. Martínez, Jesús Morales, Antonio, J. Reina, Anthony Mandow, Alejandro Pequeño-Boter*, and Alfonso García-Cerezo Dpto. Ingeniería de, Universidad de Málaga, Spain *Ingeniería UNO, Málaga, Spain 1
2 OUTLINE 1. SENSOR OVERVIEW 2. SENSOR CONSTRUCTION 3. INTRINSIC CALIBRATION 4. APPLICATION TO MOBILE ROBOTS 5. CONCLUSIONS 2
3 1. SENSOR OVERVIEW 3
4 SENSOR OVERVIEW n Low-cost 3D rangefinder with 360º field of view n Based on an off-the-shelf 2D rangefinder n Continuous spinning around the optical center of the 2D device n It weights 1.9 kg and its maximum dimensions are 125x170x222 mm. The UNO-motion 3D rangefinder 4
![, 2011] UNO-laser UNO-motion Hokuyo UTM-30LX with the pitching](/docs-images/72/67062096/images/5-2.jpg "configuration Faster acquisition time 360º field of view No visible")
5 SENSOR OVERVIEW n The design is an evolution of a previous device [Morales et al., 2011] UNO-laser UNO-motion Hokuyo UTM-30LX with the pitching configuration Faster acquisition time 360º field of view No visible wires Intensity data Hokuyo UTM-30LX-EX with the rolling configuration 5
6 SENSOR OVERVIEW n Comparison with commercial multi-beam models by Velodyne 6
7 2. SENSOR CONSTRUCTION 7
8 SENSOR CONSTRUCTION n Main components of the 3D laser scanner The 3D optical center coincides with 2D optical center An slip ring provides unrestrained rotation 8
9 SENSOR CONSTRUCTION n Blind cone produced by the rotation of the blind area of the 2D scanner The blind zone of the 2D sensor is 90º wide The radius of the cone base is equal to the height h of the optical center 9
10 SENSOR CONSTRUCTION n Functional diagram of the 3D laser rangefinder PC HOST ETHERNET 2D Commands 2D Scan 2D SENSOR SLIP RING ROTATIONAL MECHANISM Motion commands Sync USB MOTION CONTROLER Power Time & Angle Encoder data SERVOMOTOR The 2D sensor and the motion controller are accessed independently The 2D synchronization signal is captured by the motion controller 10
11 3. INTRINSIC CALIBRATION 11
12 INTRINSIC CALIBRATION n Data synchronization: 2D scans and rolling angles are received through different communication ports (Ethernet- USB) 2D static scans (in red) do not match the dynamic 2D scans (in blue) Synchronization is achieved by applying a gap of 8 times the 2D scanning time 12
13 INTRINSIC CALIBRATION n Computing Cartesian coordinates: Small errors in the attachment of the 2D device to the rotating mechanism provoke a distorted point cloud Ideal formula without construction misalignments 13
14 INTRINSIC CALIBRATION n Boresight calibration: misalignment angles can be obtained by iterative maximization of the flatness and the area of planar patches from a single 3D scan [Morales et al., 2014] After calibration with β 0 = 0.5º and α 0 = -0.02º Small translation errors can not be detected due to 2D measurement limitations 14
15 4. APPLICATION TO MOBILE ROBOTS 15
16 APPLICATION TO MOBILE ROBOTS n UAVs: the sensor can be placed upside-down at the bottom of the vehicle The maximum scanning resolution is pointing to the ground 16
17 APPLICATION TO MOBILE ROBOTS n Outdoor mobile robot Andabata: the sensor is installed centered and on a mounting to avoid shadows from the robot Increasing the height of the sensor improves the point of view, but the radius of the blind circle around the robot also grows in proportion 17
18 APPLICATION TO MOBILE ROBOTS n Extrinsic parameters on Andabata: the height of the 3D sensor above the ground and the rolling angle of the longitudinal axis of the robot The height is 72.3 cm and the angle is º Calibration has been performed by aligning the robot with a corridor and extracting planes 18
19 APPLICATION TO MOBILE ROBOTS n A 3D scan inside of a warehouse A 360º 3D scan is completed with a 180º rotation 19
20 5. CONCLUSIONS 20
21 CONCLUSIONS n A low-cost 3D laser scanner with 360º field of view have been constructed It is based on continuous spinning of a 2D device around its optical center Intrinsic and extrinsic parameters have been calibrated With direct sunlight, the maximum range of the Hokuyo-30LX-EX reduces to 15 m 21
22 CONCLUSIONS n Future work To build local navigation maps for the mobile robot Andabata To correct distortions in the 3D point cloud during movement n Web page Thank you! Gracias! 22
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