Characterization of a Longwave HgCdTe GeoSnap Detector
X-Ray, Optical, and Infrared Detectors for Astronomy XI(2024)
摘要
New longwave HgCdTe detectors are critical to upcoming plans for ground-based
infrared astronomy. These detectors, with fast-readouts and deep well-depths,
will be key components of extremely large telescope instruments and therefore
must be well understood prior to deployment. We analyze one such HgCdTe
detector, a Teledyne Imaging Sensors GeoSnap, at the University of Michigan. We
find that the properties of the GeoSnap are consistent with expectations from
analysis of past devices. The GeoSnap has a well-depth of 2.75 million
electrons per pixel, a read noise of 360 e-/pix, and a dark current of 330,000
e-/s/pix at 45 K. The device experiences 1/f noise which can be mitigated
relative to half-well shot noise with modest frequency image differencing. The
GeoSnap's quantum efficiency is calculated to be 79.7 +- 8.3
Although the GeoSnap's bad pixel fraction, on the order of 3
with other GeoSnap devices, close to a third of the bad pixels in this detector
are clustered in a series of 31 "leopard" spots spread across the detector
plane. We report these properties and identify additional analyses that will be
performed on future GeoSnap detectors.
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