Characterization of a Longwave HgCdTe GeoSnap Detector
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911964124413952 |
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| author | Bowens, Rory Meyer, Michael R. Tobin, Taylor L. Viges, Eric Hart, Dennis Monnier, John Leisenring, Jarron Ives, Derek van Boekel, Roy |
| author_facet | Bowens, Rory Meyer, Michael R. Tobin, Taylor L. Viges, Eric Hart, Dennis Monnier, John Leisenring, Jarron Ives, Derek van Boekel, Roy |
| contents | 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 % at 10.6 microns. Although the GeoSnap's bad pixel fraction, on the order of 3%, is consistent 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_20440 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Characterization of a Longwave HgCdTe GeoSnap Detector Bowens, Rory Meyer, Michael R. Tobin, Taylor L. Viges, Eric Hart, Dennis Monnier, John Leisenring, Jarron Ives, Derek van Boekel, Roy Instrumentation and Methods for Astrophysics 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 % at 10.6 microns. Although the GeoSnap's bad pixel fraction, on the order of 3%, is consistent 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. |
| title | Characterization of a Longwave HgCdTe GeoSnap Detector |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2405.20440 |