Signal nonlinearity measurements and corrections in MWIR and LWIR HgCdTe H2RG arrays for NEO Surveyor

Gregory R. Zengilowski; Craig W. McMurtry; Judith L. Pipher; Nicholas S. Reilly; William J. Forrest; Mario S. Cabrera; Meghan L. Dorn; Andre F. Wong; A. K. Mainzer

doi:10.1117/12.2563138

13 December 2020 Signal nonlinearity measurements and corrections in MWIR and LWIR HgCdTe H2RG arrays for NEO Surveyor

Gregory R. Zengilowski, Craig W. McMurtry, Judith L. Pipher, Nicholas S. Reilly, William J. Forrest, Mario S. Cabrera, Meghan L. Dorn, Andre F. Wong, A. K. Mainzer

Author Affiliations +

Proceedings Volume 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX; 1145435 (2020) https://doi.org/10.1117/12.2563138
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The depletion region around each p-n junction in HgCdTe HAWAII-2RG detector arrays decreases in volume as charge is collected, causing the pixel capacitance to change continuously throughout an integration period. This changing capacitance manifests as a steadily decreasing measured signal rate while observing a constant flux. Ignoring this nonlinear response to signal accumulation can lead to underestimating the number of detected pho- tons by as much as 10%. Presented here are two methods, one simple and one complex, of measuring this signal nonlinearity and a theoretical framework behind a nonlinearity correction method. Additionally, experimental data are compared with simulations to explain methods to reduce noise in the nonlinearity measurement and identify deviations from the expected behavior that merit further study.

Conference Presentation

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Gregory R. Zengilowski, Craig W. McMurtry, Judith L. Pipher, Nicholas S. Reilly, William J. Forrest, Mario S. Cabrera, Meghan L. Dorn, Andre F. Wong, and A. K. Mainzer "Signal nonlinearity measurements and corrections in MWIR and LWIR HgCdTe H2RG arrays for NEO Surveyor", Proc. SPIE 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX, 1145435 (13 December 2020); https://doi.org/10.1117/12.2563138

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