Volume 42, Issue 4 (July 2014)

    An Automatic Optical Inspection System for Assembly and Evaluation of an Optical Encoder

    (Received 26 June 2013; accepted 5 November 2013)

    Published Online: 2014

    CODEN: JTEOAD

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    Abstract

    This study presented an automatic optical inspection system for the assembly and evaluation of an optical encoder, and the system analyzed the output signal quality of the light transmission grating linear encoder. The reference grating was affixed to the side architecture of the detection system in order to maintain the correct optical path, and the main grating was driven by the x–y Precision platform. Brightness variations can be detected and recorded by a charge-coupled device (CCD) camera during grating movements, using image noise depression, background separation, and fringe calculation with new image processing algorithms. The output imaging signal of a traditional linear encoder passes through a circuit filter, where amplification and rectification form a sinusoidal waveform. This system can accurately measure the light intensity variations of the encoder through machine visioning and image processing, while simultaneously determining noise and non-uniformity. This study conducted analysis on the moiré width between the gratings of the flip relationship, implemented grating alignment and adjustment, and improved the assembly position and resolution of the image, in order to obtain good quality in output signals.


    Author Information:

    Lin, Chern-Sheng
    Department of Automatic Control Engineering, Feng Chia Univ., Taichung,

    Tzeng, Guo-An
    Department of Automatic Control Engineering, Feng Chia Univ., Taichung,

    Lay, Yun-Long
    Department of Electronic Engineering, National Chinyi Univ. of Technology, Taiping,

    Chen, Shiaw-Wu
    Department of Automatic Control Engineering, Feng Chia Univ., Taichung,

    Tien, Chuen-Lin
    Department of Electrical Engineering, Feng Chia Univ., Taichung,


    Stock #: JTE20130156

    ISSN: 0090-3973

    DOI: 10.1520/JTE20130156

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    Author
    Title An Automatic Optical Inspection System for Assembly and Evaluation of an Optical Encoder
    Symposium , 0000-00-00
    Committee E13