14 May 2007 Compact optical rotation sensor using CCD array
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This paper, presents a novel low-cost, compact, rugged, optical rotational sensor. The optical sensor is based on optical navigation technology, which measures changes in position by optically acquiring sequential surface images (frames) through a CCD array and mathematically determining direction and magnitude of angular displacement. Further the efficiency of the system was tested by placing the sensor 2mm above a circular disc; it was moved through a known angle. A stepper motor and a rotary stage were chosen as the references for providing the rotary motion. It was found that sensing larger radii which corresponds to a higher resolution, the scale factor of the displacement vector increased proportionally, thereby demonstrating good linearity. It was also observed that slower sensitivity (rotation rate) had a higher accuracy pointing to a trade off between frame rate and accuracy of measurement. The sensor has a resolution of 0.12° and a best accuracy of 99%.The sensor would find applications in Inertial Navigation systems and autonomous robots.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vignesh Vivek Raja, Vignesh Vivek Raja, Balaji Srinivasan, Balaji Srinivasan, "Compact optical rotation sensor using CCD array", Proc. SPIE 10316, Optifab 2007: Technical Digest, 103161C (14 May 2007); doi: 10.1117/12.721735; https://doi.org/10.1117/12.721735


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