A high-resolution measurement device for detecting the positioning accuracy of the optical fiber positioner

Yonggang Gu; Jianlei Xu; Yi Jin; Chao Zhai

doi:10.1117/12.926219

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13 September 2012 A high-resolution measurement device for detecting the positioning accuracy of the optical fiber positioner

Yonggang Gu, Jianlei Xu, Yi Jin, Chao Zhai

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Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 84503B (2012) https://doi.org/10.1117/12.926219
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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.

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Yonggang Gu, Jianlei Xu, Yi Jin, and 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

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