商用扫描仪在天文底片数字化中的测试  

A Test of Commercial Scanners for Digitization of Astronomical Plates

作　　者：于涌[1] 赵建海[1] 唐正宏[1] 廖石龙[1,2] 

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院大学,北京100049

出　　处：《天文研究与技术》2013年第3期288-292,共5页Astronomical Research & Technology

基　　金：国家自然科学基金(11043001);上海市空间导航与定位技术重点实验室(06DZ22101)资助

摘　　要：我国的天文底片数字化工作已正式启动,选取高精度的扫描仪是该工作首要和基本的任务。对Epson公司的V750 Pro和10000XL,以及Phase One公司的PowerPhase FX+扫描仪开展了测试,结果表明,PowerPhase FX+具有较高的扫描精度,一方面,该扫描仪扫描方向的稳定性与线阵CCD方向相当,均优于0.5μm;另一方面,通过UCAC3参考星归算结果显示,尽管PowerPhase FX+的照相式扫描会带来像场畸变,但考虑3阶底片模型后,扫描星像的位置精度较高。对于上海天文台佘山40 cm折射望远镜1987年拍摄的M79底片,扫描星像的位置精度优于0.1″。Digitization of astronomical plates has started in China, and the selection of high-precision scanners is a primary task for the digitization. We have tested 3 scanners, Epson V750 Pro, Epson IO000XL, and Phase One PowerPhase FX^＋. We have found that the PowerPhase FX^＋ has the highest scan precision, with the stability of scanning direction better than 0. 5 μm which equals to that of the CCD linear-array direction. We use the UCAC3 catalog as the reference in the test. Our results show that the images resulting from the scanning of a PowerPhase FX~ have complicated distortions, which need to be corrected with a 3-order plate model. Using such corrections the positional measurement accuracy of stars is 0.1″ for the M79 astronomical plate taken with the Sheshan 40cm Telescope of the Shanghai Astronomical Observatory in 1987.

关 键 词：天文底片 数字化 照相天体测量 扫描仪 

分 类 号：P123.14[天文地球—天体测量]