图像比例尺标定技术的比较：已知对、漂移扫描和孔径光栅
Comparison of Image Scale Calibration Techniques: Known Pairs, Drift Scans and Aperture Grating
摘要：
我们比较了几种用于校准宽（>1角秒）对之间的角间距的技术。这些技术是（i）使用α Cen AB轨道参数的参考对校准，（ii）视频漂移方法，和（iii）利用具有不同通带的红色滤光片的孔径衍射光栅。使用这3种校准技术测定62对的分离度并进行比较。结果表明，α Cen AB法和视频漂移法具有较好的一致性。使用光栅和滤波器（通过测量条纹间距）证明宽带滤波器不能令人满意，而使用窄带Hα滤波器和光栅，导致图像尺度与使用α Cen AB参考对校准和视频漂移方法获得的图像尺度分别相差0.024和0.031像素/弧秒（px/arcsec）。Hα滤光片和光栅的夫琅禾费衍射的更完整建模产生了0.009 px/arcsec的图像尺度差异。衍射光栅方法中的偏差在对分离中约为0.1%，也显示了其本身，并且无法解释。我们的结论是，对一个已知的对，分离和PA是已知的高精度的校准可能是最简单和最好的方式进行图像尺度校准。
英文摘要：
We compared several techniques for calibrating angular separation between wide (>1 arcsec) pairs. These techniques are (i) reference pair calibration using α Cen AB orbital parameters, (ii) the video drift method, and (iii) the utilisation of an aperture diffraction grating with red filters of different passbands. Separations of 62 pairs were determined using these 3 calibration techniques and compared. It was found that α Cen AB and video drift methods are in good agreement. The use of the grating and filter (by measuring fringe spacing) proved unsatisfactory for the broad-band filters, and the use of a narrow band Hα filter with the grating, resulted in image scales that differed from those obtained using α Cen AB reference pair calibration and the video drift method by 0.024 and 0.031 pixel/arcsec (px/arcsec) respectively. A more complete modelling of Fraunhofer diffraction of the Hα filter and grating produced a difference in image scale of 0.009 px/arcsec. A bias in the diffraction grating method of ~0.1% in the separation of pairs also revealed itself and could not be accounted for. We conclude that calibration against a known pair for which the separation and PA is known with high precision is probably the simplest and best way to undertake image scale calibration.
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