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.
CMOS detectors are becoming widely used in astronomy because of their low noise and high-speed readout. Projects like the upcoming Argus Array, an optical survey instrument consisting of 1,200 28-cm telescopes which will image 8,000 square degrees every minute, depend on the low-noise characteristics of these sensors t...
William J. Marshall, H. Corbett, Shannon K. Fitton et al.· Astronomical Telescopes + In...· 2 citations
Future space astrometry missions such as Theia and an astrometric mode of the Habitable Worlds Observatory (HWO) require detector calibration and instrumental characterization at an unprecedented level to achieve sub-micro-arcsecond precision. This work presents three complementary developments addressing these require...
M. Lizzana, Fabien Malbet, H. Rousset et al.· Astronomical Telescopes + In...· 0 citations
The Spectrometer/Telescope for Imaging X-rays (STIX) on board Solar Orbiter provides imaging information on the X-ray sources in solar flares by modulating the emitted radiation with pairs of grids made of stacked tungsten layers. Optical measurements of the grids were taken on the ground and utilized to derive an init...
P. Massa, A. Volpara, M. Stiefel et al.· Solar Physics· 0 citations
To meet the requirements of future high-throughput and high spatial resolution Lynx-like X-ray observatories, the Pennsylvania State University High-Energy Astrophysics Detector and Instrumentation Lab, in collaboration with Teledyne Imaging Sensors (TIS), has developed a next-generation small-pixel soft X-ray hybrid C...
Lukas R. Stone, A. Falcone, J. Colosimo et al.· Astronomical Telescopes + In...· 1 citation
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