Characterization of the detector subsystem for the near-infrared spectrograph (NIRSpec) on the James Webb Space Telescope

Mott, Derrick; Waczynski, Augustyn; Wen, Yiting; Rauscher, Bernard J.; Boehm, Nicholas; Chiao, Meng P.; Degumbia, Lantrinh; Delo, Greg; Foltz, Roger; Kan, Emily; Alexander, D. M.; Cabelli, Craig A.; Clemons, Brian; Connelly, Joseph A.; Dea, Alex; Derro, Rebecca J.; Engler, Charles; Feizi, Ali; Fox, O.; Hill, Robert J.; Johnson, Thomas E.; Lander, Matthew; Lindler, Don J.; Loose, Markus; Manthripragada, Sridhar S.; Novo-Gradac, Kevin J.; Roher, Wayne D.; Rosenberry, Robert; Shakoorzadeh, Kamdin B.; Smith, Miles T.; Wilson, Donna M.; Zino, Joseph

doi:10.1117/12.789099

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…8 The clocks and bias voltages were produced by the SIDECAR ASIC that also digitized the detector outputs. In our tests, a typical sample up the ramp measurement was done, in which the entire array was sampled 88 times with a 10.74 s intersample interval.…”

Section: Experimental Configuration and Measurementsmentioning

confidence: 99%

Reducing the read noise of H2RG detector arrays: eliminating correlated noise with efficient use of reference signals

et al. 2010

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We present a process for characterizing the correlation properties of the noise in large two-dimensional detector arrays, and describe an efficient process for its removal. In the case of the 2k × 2k HAWAII-2RG detectors (H2RG) detectors from Teledyne which are being used on the Near Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST), we find that we can reduce the read noise by thirty percent. Noise on large spatial scales is dramatically reduced. With this relatively simple process, we provide a performance improvement that is equivalent to a significant increase in telescope collecting area for high resolution spectroscopy with NIRSpec.

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Section: Experimental Configuration and Measurementsmentioning

confidence: 99%

Reducing the read noise of H2RG detector arrays: eliminating correlated noise with efficient use of reference signals

et al. 2010

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“…We tested IRS 2 using the JWST ultra-low background test dewar 13,14 in the NASA Goddard Space Flight Center Detector Characterization Laboratory (DCL). 10 This is the same test setup that was used for characterizing the NIRSpec Flight and Flight Spare DSs.…”

Section: Methodsmentioning

confidence: 99%

Reducing the read noise of HAWAII-2RG detector systems with improved reference sampling and subtraction (IRS²)

et al. 2012

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IRS' is a Wiener-optimal approach to using all of the reference information that Teledyne's HAWAII-2RG detector arrays provide. Using a new readout pattern, IRS2 regularly interleaves refer~nce pixels with the normal pixels during readout. This differs from conventional clocking, in which the reference pixels are read out infrequently, and only in a few rows and columns around the outside edges of the detector array. "During calibration, the data are processed in Fourier space, which is <;:lose to the noise's eigenspace. Using ms 2 I we have reduced the read noise of the James Webb Space Telescope Near Infrared Spectrograph by 15% compared to conventional readout. We are attempting to achieve further gains by calibrating out recently recognized non-stationa.ry noise that appears at the frame rate.

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“…For WFIRST, the combination of: (1) Hg 1−x Cd x Te with x = 0.445 , (2) a 5 µm thick absorber, and (3) all planned science being done at wavelengths λ < 2 µm means that fringing 32 is extremely unlikely with a correctly fabricated WFIRST H4RG.…”

Section: Absorption Of Lightmentioning

confidence: 99%

Properties and characteristics of the WFIRST H4RG-10 detectors

Mosby,,

Rauscher,

Bennett

et al. 2020

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The Wide-Field Infrared Survey Telescope (WFIRST) will answer fundamental questions about the evolution of dark energy over time and expand the catalog of known exoplanets into new regions of parameter space. Using a Hubble-sized mirror and 18 newly developed HgCdTe 4K x 4K photodiode arrays (H4RG-10), WFIRST will measure the positions and shapes of hundreds of millions of galaxies, the light curves of thousands of supernovae, and the microlensing signals of over a thousand exoplanets toward the bulge of the Galaxy. These measurements require unprecedented sensitivity and characterization of the Wide Field Instrument (WFI), particularly its detectors. The WFIRST project undertook an extensive detector development program to create focal plane arrays that meet these science requirements. These prototype detectors have been characterized and their performance demonstrated in a relevant space-like environment (thermal vacuum, vibration, acoustic, and radiation testing), advancing the H4RG-10's technology readiness level (TRL) to TRL-6. We present the performance characteristics of these TRL-6 demonstration devices.

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Characterization of the detector subsystem for the near-infrared spectrograph (NIRSpec) on the James Webb Space Telescope

Cited by 5 publications

References 1 publication

Reducing the read noise of H2RG detector arrays: eliminating correlated noise with efficient use of reference signals

Reducing the read noise of H2RG detector arrays: eliminating correlated noise with efficient use of reference signals

Reducing the read noise of HAWAII-2RG detector systems with improved reference sampling and subtraction (IRS²)

Properties and characteristics of the WFIRST H4RG-10 detectors

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Characterization of the detector subsystem for the near-infrared spectrograph (NIRSpec) on the James Webb Space Telescope

Cited by 5 publications

References 1 publication

Reducing the read noise of H2RG detector arrays: eliminating correlated noise with efficient use of reference signals

Reducing the read noise of H2RG detector arrays: eliminating correlated noise with efficient use of reference signals

Reducing the read noise of HAWAII-2RG detector systems with improved reference sampling and subtraction (IRS2)

Properties and characteristics of the WFIRST H4RG-10 detectors

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Product

Resources

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Reducing the read noise of HAWAII-2RG detector systems with improved reference sampling and subtraction (IRS²)