Preliminary research on focal plane calibration method in LAMOST based on flexible planar target

Lianpo Wang; Ye Zhu; Xiang Lu; Yonggang Gu; Chao Zhai

doi:10.1117/1.OE.57.5.054109

21 May 2018 Preliminary research on focal plane calibration method in LAMOST based on flexible planar target

Lianpo Wang, Ye Zhu, Xiang Lu, Yonggang Gu, Chao Zhai

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 054109 (May 2018). https://doi.org/10.1117/1.OE.57.5.054109

Abstract

In the large sky area multiobject optical fiber spectroscopy telescope project, to capture the spectrum of a particular object, the optical fiber positioner must position the optical fiber end face to a specified location on the focal plane. The accuracy of the optical fiber positioner is guaranteed by feedback from photogrammetry. Photogrammetry accuracy is based on accurate calibration. However, given the complexities in the optical fiber focal plane and the optical fiber positioner, the accurate standard point is considerably difficult to obtain, which results in insufficient calibration accuracy. To solve this problem, a convenient calibration method based on the combination of small, planar targets is proposed. In this method, each optical fiber positioner positions the optical fiber to several designed locations, which are relatively accurate. These points form a high-precision, two-dimensional point array that can be used as the planar target. In this manner, each optical fiber positioner can be regarded as a small, high-precision planar target. All small, high-precision planar targets are assembled to form the flexible planar target, which is used for calibration. The experimental result indicates that this method is highly accurate and can be applied in focal plane calibration.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Lianpo Wang, Ye Zhu, Xiang Lu, Yonggang Gu, and Chao Zhai "Preliminary research on focal plane calibration method in LAMOST based on flexible planar target," Optical Engineering 57(5), 054109 (21 May 2018). https://doi.org/10.1117/1.OE.57.5.054109

Received: 5 March 2018; Accepted: 1 May 2018; Published: 21 May 2018

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