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13 September 2012A high-resolution measurement device for detecting the positioning accuracy of the optical fiber positioner
The optical fiber positioner with double revolving mechanism is driven by two stepping motors. One stepping motor drives
center revolving mechanism and the other drives decentered slewing mechanism. Photogrammetry is currently used to
detect the positioning accuracy of the optical fiber positioner, but it cannot achieve high precision because of the small size
of the fiber’s diameter. So, a new measurement device, which mainly contained optical microscope, CCD camera and
two-dimensional precision mobile platform, was established in this paper. One end of the optical fiber (the other end was
lighted by integrating sphere light source) was imaged on the CCD sensor in a magnified way through the optical
microscope, and the image was processed to build the position feedback mechanism in real time. Then the two-dimensional
mobile platform was controlled by PID control method to track the optical fiber, and the fiber was always kept to locate in
center of the CCD image in order to eliminate the aberrations of the optical microscope lens. Finally, the position changes
of the moving fiber could be obtained by the coordinates of the two-dimensional precision mobile platform. The
experimental results demonstrate that the resolution of this measurement device is 0.1μm and the accuracy of repeat
positioning is 1.5μm. The measurement device could satisfy the testing requirement.
Yonggang Gu,Jianlei Xu,Yi Jin, andChao Zhai
"A high-resolution measurement device for detecting the positioning accuracy of the optical fiber positioner", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84503B (13 September 2012); https://doi.org/10.1117/12.926219
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Yonggang Gu, Jianlei Xu, Yi Jin, Chao Zhai, "A high-resolution measurement device for detecting the positioning accuracy of the optical fiber positioner," Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84503B (13 September 2012); https://doi.org/10.1117/12.926219