Dissertation
Dissertation > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Automatic detection system using a variety of new technologies

The Design of a Real-time and High-Precision Laser Triangulation System

Author FengJinCheng
Tutor BianBaoMin;WangChunYong
School Nanjing University of Technology and Engineering
Course Optical Engineering
Keywords Laser triangulation Linear CCD Subpixel algorithm FPGA The data processing
CLC TP274.5
Type Master's thesis
Year 2008
Downloads 615
Quotes 12
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Laser triangulation has a fast , non-contact , high-precision , etc. , have been widely used in the detection system . But with the development of industrial technology , higher and higher requirements on the detection of micro-displacement , high-speed , high-precision , large range , small size and intelligence become the development direction of the triangulation . The paper triangular rangefinder ranging accuracy of the prevailing low and slow , focus on the CCD sub- pixel positioning subdivision algorithm and its hardware implementation , successfully designed and developed a linear CCD - based high-speed high-precision real - time laser triangulation system . First, research research status at home and abroad laser triangulation , the triangulation principle and characteristics of linear CCD . Secondly, several commonly take full advantage of spot near numerous linear CCD subpixel algorithm , and through the spot image collected off-line analysis and processing , in-depth analysis , comparison and improvement of these algorithms , eventually find a high precision and easy hardware implementation of the relatively optimal algorithm - octave interpolation gray centroid algorithm , which significantly improve the positioning accuracy and stability of the system . Again , the detailed description of the triangulation system hardware and software design of the hardware platform and the sub-pixel algorithm hardware implementation, the use of FPGA logic resources, and fast data processing capabilities of the ARM , in order to achieve high - speed real-time online detection . Finally, the system stability , calibration and precision experiments . Experimental results show that the system has a high stability , range accuracy up to 0.03mm, maximum range to 135 mm , real-time online measurement speed is adjustable from 1 to 36K / s . The results of this thesis greatly improve the accuracy and speed of laser triangulation , is conducive to miniaturization of the system and intelligent , has a strong practical value .

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