Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry

M. Shao; I. Hahn

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arXiv · 2608.14874

Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry

M. Shao·I. Hahn

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Abstract

Many sources of systematic error are important to centroid the position of a star below the level of $10^{-4}$ of the FWHM of the stellar image. One of the more important sources of centroiding error is the imperfect position of the pixels in a focal plane array. In this paper, we discuss the calibration of pixel position of multiple commercial CMOS detectors. Focal plane arrays are semiconductor devices fabricated with 10's nanometer precision. However, the effective location of a pixel can be biased if there's a QE gradient across the pixel. We typically see pixel position variations of 1--3\% of a pixel in most CMOS imagers. This paper describes how we measure the position of each pixel below the $10^{-3}$ pixel level. We also describe how this information might be used in a least square fitting of an airy spot to obtain a higher accuracy position of the centroid of the PSF.

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M. Shao, I. Hahn. 2026-08-14. Sub-Pixel Calibration of CMOS Sensors for Precision Astrometry. https://arxiv.org/abs/2608.14874

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