Results of drift scanning to optimize the SNR in the mid-infrared
Chopping and nodding is made to reduce the effects of the time variable components of (a) sky variation and (b) array background in the mid-infrared waveband when observing from the ground. This process, however, has many issues including reduced on-object photon collection time, demands on the secondary mirror, and nodding the telescope to remove
Torres-Quijano, A. et al.
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2021