Quantum efficiency modeling for a thick back-illuminated astronomical CCD

Groom, D. E.; Haque, S. Maidul; Holland, Steven E.; Kolbe, W.

doi:10.1063/1.4986506

Cited by 15 publications

(14 citation statements)

References 51 publications

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“…The Allpix spectrum was generated using the synthetic UCN hits while incorporating a dead layer into the bCCD model. The dead layer for the bCCD is fully characterized by LBNL [22]. With the dead layer modeled, the Allpix energy spectrum distribution and peaks well matches the experimental, which shows that the energy loss and charge creation within the detector is well captured by Allpix.…”

Section: Pos(pixel2022)041mentioning

confidence: 58%

Ultrafast CMOS image sensors and data-enabled super-resolution for multimodal radiographic imaging and tomography

Wang¹,

Yue²,

Lin³

et al. 2023

Proceedings of 10th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging — PoS(Pixel2022)

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We summarize recent progress in ultrafast Complementary Metal Oxide Semiconductor (CMOS) image sensor development and the application of neural networks for post-processing of CMOS and charge-coupled device (CCD) image data to achieve sub-pixel resolution (thus 'super-resolution'). The combination of novel CMOS pixel designs and data-enabled image post-processing provides a promising path towards ultrafast high-resolution multi-modal radiographic imaging and tomography applications.

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Section: Pos(pixel2022)041mentioning

confidence: 58%

Ultrafast CMOS image sensors and data-enabled super-resolution for multimodal radiographic imaging and tomography

Wang¹,

Yue²,

Lin³

et al. 2023

Proceedings of 10th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging — PoS(Pixel2022)

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show abstract

“…Thicker CCDs have more opportunities for absorption of the incoming photon than thinner CCDs at the same temperature, and the effective absorption length is an decreasing function of temperature. Groom et al (2017) provide a detailed discussion of the transmissions for thick CCD sensors and compare measured data to theoretical models of transmission. Figure 2 of Groom et al (2017) shows the absorption length is ∼200 μm at λ = 1000 nm, following the models of Rajkanan et al (1979).…”

Section: Discussionmentioning

confidence: 99%

“…Groom et al (2017) provide a detailed discussion of the transmissions for thick CCD sensors and compare measured data to theoretical models of transmission. Figure 2 of Groom et al (2017) shows the absorption length is ∼200 μm at λ = 1000 nm, following the models of Rajkanan et al (1979).…”

Section: Discussionmentioning

confidence: 99%

GPS Measurements of Precipitable Water Vapor Can Improve Survey Calibration: A Demonstration from KPNO and the Mayall z-band Legacy Survey

Wood‐Vasey

Perrefort

Baker

2022

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Dual-band Global Positioning Satellite (GPS) measurements of precipitable water vapor (PWV) at the Kitt Peak National Observatory predict the overall per-image sensitivity of the Mayall z-band Legacy Survey (MzLS). The per-image variation in the brightness of individual stars is strongly correlated with the measured PWV and the color of the star. Synthetic stellar spectra through TAPAS transmission models successfully predict the observed PWV-induced photometric variation. We find that PWV absorption can be well approximated by a linear relationship with (airmass × PWV)0.6 and present an update on the traditional treatment in the literature. The MzLS zero-point sensitivity in electrons s−1 varies with a normalized-mean absolute deviation of 61 mmag. PWV variation accounts 23 mmag of this zero-point variation. The MzLS per-image absolute sensitivity decreases by 40 mmag per effective mm of PWV. The overall gray offset portion of this variation is corrected by the calibration to a reference catalog. But the relative calibration error between blue (r − z < 0.5 mag) versus red (1.2 mag < r − z) stars increases by 0.3–2 mmag per effective mm of PWV. We argue that GPS systems provide more precise PWV measurements than using differential measurements of stars of different colors and recommend that observatories install dual-band GPS as a low-maintenance, low-cost, auxiliary calibration system. We extend our results of the need for well-calibrated PWV measurements by presenting the calculations of the PWV photometric impact on three science cases of interest: stellar photometry, supernova cosmology, and quasar identification and variability.

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“…CCD TEMPERATURE VARIATION WAS NOT A SOURCE OF SIGNIFICANT ZERO POINT VARIATION CCD temperatures can have a significant effect on the z-band QE. See Groom et al (2017) for a detailed discussion of the transmissions for these thick CCD sensors used in Mosaic-3. As we approach the Si band-gap energy, single-and double-phonon-assisted conversion of photons becomes at first a significant and then the dominant source of promotion of electrons into the conductance band.…”

Section: Appendixmentioning

confidence: 99%

GPS Measurements of Precipitable Water Vapor Can Improve Survey Calibration: A Demonstration from KPNO and the Mayall z-band Legacy Survey

Wood‐Vasey¹,

Perrefort²,

Baker³

2020

Preprint

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Accounting for the effects of atmospheric absorption is a key step in calibrating highaccuracy photometry. In particular, the atmospheric transmission redward of 550 nm is dominated by absorption due to water vapor. We here show that dual-band GPS measurements of precipitable water vapor (PWV) at the Kitt Peak National Observatory (KPNO) predict the overall per-image sensitivity of the Mayall z-band Legacy Survey (MzLS). We further find that the per-image variation in the brightness of individual stars is strongly correlated with the measured PWV and the color of the star. We use synthetic stellar spectra and TAPAS transmission models to predict the expected PWV-induced photometric errors and find good agreement with the observations. In line with previous work in the literature we also find that PWV absorption can be well-approximated by a linear relationship with PWV eff los and present an update on the traditional treatment in the literature.Within the range of reasonable observing conditions, the MzLS zero point varies with a standard deviation of 127 mmag. This variation is dominated by a gray secular trend with time, consistent with a gradual accumulation of contamination on optical surfaces that accounts for ∼114 mmag of variation. Correcting for PWV based on a suite of stellar spectra and detailed PWV absorption models accounts for another 47 mmag of zero-point variation. The MzLS per-image sensitivity is decreased by ∼40 mmag per effective mm of PWV. The difference between blue (r − z < 0.5 mag) and red (1.2 mag < r − z) stars increases by 3.25 mmag per effective mm of PWV.These results show the need for high-precision photometric surveys to simultaneously monitor PWV. We find that GPS systems provide more precise PWV measurements than using differential measurements of stars of different colors and recommend that observatories that observe long-ward of 800 nm install dual-band GPS as a lowmaintenance, relatively low cost, auxiliary calibration system. We extend our results of the need for well-calibrated PWV measurements by presenting calculations of the PWV photometric impact on three science cases of interest: stellar photometry, supernova cosmology, and quasar identification and variability.

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Quantum efficiency modeling for a thick back-illuminated astronomical CCD

Cited by 15 publications

References 51 publications

Ultrafast CMOS image sensors and data-enabled super-resolution for multimodal radiographic imaging and tomography

Ultrafast CMOS image sensors and data-enabled super-resolution for multimodal radiographic imaging and tomography

GPS Measurements of Precipitable Water Vapor Can Improve Survey Calibration: A Demonstration from KPNO and the Mayall z-band Legacy Survey

GPS Measurements of Precipitable Water Vapor Can Improve Survey Calibration: A Demonstration from KPNO and the Mayall z-band Legacy Survey

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