Improving H2RG Performance in SPHEREx Brassboard Model
Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer is an upcoming NASA satellite mission to study the physics of inflation, the history of galaxy formation, and the abundance of biogenic ices in the Milky Way, obtaining the first all-sky spectroscopic survey...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Supplement Series |
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| Online Access: | https://doi.org/10.3847/1538-4365/ad97bd |
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| author | Chi H. Nguyen Phillip Korngut C. Darren Dowell James Bock Jill Burnham Samuel Condon Walter Cook Grigory Heaton Howard Hui Branislav Kecman Hiromasa Miyasaka Kenneth Manatt Hien T. Nguyen Stephen Padin Marco Viero |
| author_facet | Chi H. Nguyen Phillip Korngut C. Darren Dowell James Bock Jill Burnham Samuel Condon Walter Cook Grigory Heaton Howard Hui Branislav Kecman Hiromasa Miyasaka Kenneth Manatt Hien T. Nguyen Stephen Padin Marco Viero |
| author_sort | Chi H. Nguyen |
| collection | DOAJ |
| description | Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer is an upcoming NASA satellite mission to study the physics of inflation, the history of galaxy formation, and the abundance of biogenic ices in the Milky Way, obtaining the first all-sky spectroscopic survey at infrared wavelengths 0.75–5.0 μ m. The instrument implements HAWAII-2RG (H2RG) detectors and custom-built Video8 electronics with multiple sampling features to optimize the H2RG noise performance, including nonsequential row reads, voltage monitoring, multiple visits to optically dark reference pixels, as well as onboard slope fitting and cosmic-ray removal. We report here the performance of a single H2RG with the readout electronics. We focus on the effectiveness of multiple reference samplings to reduce 1/ f noise most relevant to the galaxy formation analysis, in particular the noise on large angular scales k <0.13 [pix ^−1 ] (∼5″–20″) where the imprints of galaxy clustering will be measured. Our characterization confirms that increased sampling of reference pixels successfully reduces the 1/ f noise by ∼50% at these scales. However, the effectiveness of multiple reference reads is limited by irreducible per-pixel telegraph noise. Further noise reduction can be achieved by using optical pixels in addition to the reference pixels to remove common-mode signal offsets in each channel. Additionally, we observe that the gain of optical pixels is consistently ∼90% that of the reference pixels, prompting additional correction steps in the data reduction pipeline. |
| format | Article |
| id | doaj-art-1586bbb664184acdae21e1a9bf22abdb |
| institution | Kabale University |
| issn | 0067-0049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-1586bbb664184acdae21e1a9bf22abdb2025-01-15T09:44:37ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127624310.3847/1538-4365/ad97bdImproving H2RG Performance in SPHEREx Brassboard ModelChi H. Nguyen0https://orcid.org/0000-0001-9368-3186Phillip Korngut1C. Darren Dowell2James Bock3Jill Burnham4Samuel Condon5https://orcid.org/0000-0003-4255-3650Walter Cook6Grigory Heaton7https://orcid.org/0009-0003-5681-2956Howard Hui8https://orcid.org/0000-0001-5812-1903Branislav Kecman9Hiromasa Miyasaka10https://orcid.org/0000-0002-8074-4186Kenneth Manatt11Hien T. Nguyen12Stephen Padin13Marco Viero14California Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduJet Propulsion Laboratory, California Institute of Technology , Pasadena CA 91109, USACalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.edu; Jet Propulsion Laboratory, California Institute of Technology , Pasadena CA 91109, USACalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduJet Propulsion Laboratory, California Institute of Technology , Pasadena CA 91109, USAJet Propulsion Laboratory, California Institute of Technology , Pasadena CA 91109, USACalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduCalifornia Institute of Technology , Pasadena CA 91125, USA ; chnguyen@caltech.eduSpectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer is an upcoming NASA satellite mission to study the physics of inflation, the history of galaxy formation, and the abundance of biogenic ices in the Milky Way, obtaining the first all-sky spectroscopic survey at infrared wavelengths 0.75–5.0 μ m. The instrument implements HAWAII-2RG (H2RG) detectors and custom-built Video8 electronics with multiple sampling features to optimize the H2RG noise performance, including nonsequential row reads, voltage monitoring, multiple visits to optically dark reference pixels, as well as onboard slope fitting and cosmic-ray removal. We report here the performance of a single H2RG with the readout electronics. We focus on the effectiveness of multiple reference samplings to reduce 1/ f noise most relevant to the galaxy formation analysis, in particular the noise on large angular scales k <0.13 [pix ^−1 ] (∼5″–20″) where the imprints of galaxy clustering will be measured. Our characterization confirms that increased sampling of reference pixels successfully reduces the 1/ f noise by ∼50% at these scales. However, the effectiveness of multiple reference reads is limited by irreducible per-pixel telegraph noise. Further noise reduction can be achieved by using optical pixels in addition to the reference pixels to remove common-mode signal offsets in each channel. Additionally, we observe that the gain of optical pixels is consistently ∼90% that of the reference pixels, prompting additional correction steps in the data reduction pipeline.https://doi.org/10.3847/1538-4365/ad97bdAstronomical detectorsNear infrared astronomyAstronomical instrumentationSpace telescopes |
| spellingShingle | Chi H. Nguyen Phillip Korngut C. Darren Dowell James Bock Jill Burnham Samuel Condon Walter Cook Grigory Heaton Howard Hui Branislav Kecman Hiromasa Miyasaka Kenneth Manatt Hien T. Nguyen Stephen Padin Marco Viero Improving H2RG Performance in SPHEREx Brassboard Model The Astrophysical Journal Supplement Series Astronomical detectors Near infrared astronomy Astronomical instrumentation Space telescopes |
| title | Improving H2RG Performance in SPHEREx Brassboard Model |
| title_full | Improving H2RG Performance in SPHEREx Brassboard Model |
| title_fullStr | Improving H2RG Performance in SPHEREx Brassboard Model |
| title_full_unstemmed | Improving H2RG Performance in SPHEREx Brassboard Model |
| title_short | Improving H2RG Performance in SPHEREx Brassboard Model |
| title_sort | improving h2rg performance in spherex brassboard model |
| topic | Astronomical detectors Near infrared astronomy Astronomical instrumentation Space telescopes |
| url | https://doi.org/10.3847/1538-4365/ad97bd |
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