28 April 2017 Method for absolute angle positioning by non-distortion laser speckles imaging technique
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Abstract
In our research, we present a novel method for absolute angle positioning by non-distortion laser speckles imaging technique. On the surface of a circular plate, we can use a non-distortion speckles imaging device to get the nondistortion image according to its 3D profile. When the plate is rotating, we can continuously measure the speckles images, with each shot overlaps with the previous one. After the plate rotates by 360 degree, a ring-shaped speckles image is formed with several small shots will be acquired. Since the speckles image of each position is unique, the image can be directly corresponded to the angle coordinate. After getting all the images needed, database which includes all the speckles images and their corresponding angle can be built up. To measure the angle of any position on the plate surface, we can first get a real-time speckles image of that position, and thereby get the absolute angle of it after comparison to the database. In our experiment, we use SAD (Sum of Absolute Difference) to analyze the images and measure the angular displacement of the plate. The result shows that the positioning accuracy can reach 0.5 second by this method. This technique could be used to develop speckles image absolute positioning encoder.
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Yi-Yuh Hwang, Yi-Yuh Hwang, Yu-Hsiang Wu, Yu-Hsiang Wu, Chin-Der Hwang, Chin-Der Hwang, } "Method for absolute angle positioning by non-distortion laser speckles imaging technique", Proc. SPIE 10209, Image Sensing Technologies: Materials, Devices, Systems, and Applications IV, 102090Y (28 April 2017); doi: 10.1117/12.2267862; https://doi.org/10.1117/12.2267862
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