Distance Measurement Utilizing Image-Based Triangulation

This paper describes a distance-measuring sensor that utilizes image-based triangulation. The angle toward a laser spot changes with distance and is converted into a distance with the help of a calibration procedure. The sensor removes the background illumination with a linear polarizer, a bandpass filter, and knowledge of the line on the focal plane that the imaged laser spot moves along. The sensor utilizes a charge-coupled device detector and an eye safe laser. The sensor operates up to a distance of 10 m. The accuracy of the detector is 1.5 mm at 1 m distance, decreasing to 8 mm at 4 m distance. The sensor is able to track targets at velocities faster than 3.6 m/s at distances up to 4 m. The acquisition time for a target is typically 50 ms and update rates range from 6 Hz at 8 m distance for a low-reflectivity target to 340 Hz at 1 m distance for a high-reflectivity target.

[1]  Luigi Rovati,et al.  Absolute distance meter based on a frequency-modulated laser diode , 1998 .

[2]  3D Metrology Camera , 2007, 2007 IEEE Aerospace Conference.

[3]  J. Kostamovaara,et al.  Precise pulsed time-of-flight laser range finder for industrial distance measurements , 2001 .

[4]  M. Amann,et al.  Laser ranging: a critical review of usual techniques for distance measurement , 2001 .

[5]  Kurt Konolige,et al.  A low-cost laser distance sensor , 2008, 2008 IEEE International Conference on Robotics and Automation.

[6]  Roger Stettner,et al.  THREE DIMENSIONAL FLASH LADAR FOCAL PLANES AND TIME DEPENDENT IMAGING , 2008 .

[7]  C. Padgett,et al.  Three dimensional imaging utilizing structured light , 2004, 2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720).

[8]  François Blais Review of 20 years of range sensor development , 2004, J. Electronic Imaging.

[9]  K. Brown,et al.  Spacecraft hazard avoidance utilizing structured light , 2006, 2006 IEEE Aerospace Conference.

[10]  S. Dubovitsky,et al.  Absolute Optical Metrology: Nanometers to Kilometers , 2005, 2005 Pacific Rim Conference on Lasers & Electro-Optics.

[11]  M. Mettenleiter,et al.  TERRESTRIAL LASER SCANNING – NEW PERSPECTIVES IN 3D SURVEYING , 2004 .

[12]  Michael Lehmann,et al.  An all-solid-state optical range camera for 3D real-time imaging with sub-centimeter depth resolution (SwissRanger) , 2004, SPIE Optical Systems Design.

[13]  G. Beheim,et al.  Range finding using frequency-modulated laser diode. , 1986, Applied optics.

[14]  Carl Christian Liebe,et al.  Accuracy performance of star trackers - a tutorial , 2002 .

[15]  G. Häusler,et al.  Laser triangulation: fundamental uncertainty in distance measurement. , 1994, Applied optics.

[16]  Kyihwan Park,et al.  A multiple phase demodulation method for high resolution of the laser scanner. , 2009, The Review of scientific instruments.

[17]  Hamid Hemmati,et al.  Laser radar for spacecraft guidance applications , 2003, 2003 IEEE Aerospace Conference Proceedings (Cat. No.03TH8652).

[18]  P. Seitz,et al.  Planar distance and velocity sensor , 1994 .

[19]  Joe-Air Jiang,et al.  Applications of the Integrated High-Performance CMOS Image Sensor to Range Finders — from Optical Triangulation to the Automotive Field , 2008, Sensors.

[20]  W. Boehler,et al.  3D SCANNING INSTRUMENTS , 2002 .

[21]  Takahide Mizuno,et al.  Development of Pulse Detection IC for Space LIDAR , 2010 .

[22]  Karsten Danzmann,et al.  Laser interferometer for spaceborne mapping of the Earth's gravity field , 2009 .

[23]  H. Zwally,et al.  Overview of the ICESat Mission , 2005 .

[24]  Nandini Bhattacharya,et al.  Absolute distance metrology for space interferometers , 2004, SPIE Astronomical Telescopes + Instrumentation.

[25]  Francois Blais,et al.  Eye-safe digital 3-D sensing for space applications , 2000 .

[26]  Bedabrata Pain,et al.  Active pixel sensor (APS) based star tracker , 1998, 1998 IEEE Aerospace Conference Proceedings (Cat. No.98TH8339).

[27]  Giovanna Sansoni,et al.  State-of-The-Art and Applications of 3D Imaging Sensors in Industry, Cultural Heritage, Medicine, and Criminal Investigation , 2009, Sensors.

[28]  U. Hollenbach,et al.  Characterization of a micro optical distance sensor , 2002, IEEE/LEOS International Conference on Optical MEMs.

[29]  M. Lescure,et al.  Crosstalk analysis of 1 m to 10 m laser phase-shift range finder , 1997 .

[30]  T. Tran-Cong,et al.  Non-contact extrudate profilometer - introductory paper , 1997, Proceedings Fourth Annual Conference on Mechatronics and Machine Vision in Practice.

[31]  A. Kilpela,et al.  PULSED TIME-OF-FLIGHT LASER RANGE FINDER TECHNIQUES FOR FAST, HIGH PRECISION MEASUREMENT APPLICATIONS , 2004 .

[32]  Francois Blais,et al.  Active 3D sensing , 2000 .

[33]  Alex Abramovici,et al.  Feedback Control Systems , 2000 .

[34]  Yuhki Kitazono,et al.  A Proposal of High-Performance Method for Distance Measuring Sensor United with PSD , 2010 .

[35]  M. Ikeda,et al.  A 375 /spl times/ 365 high-speed 3-D range-finding image sensor using row-parallel search architecture and multisampling technique , 2005, IEEE Journal of Solid-State Circuits.