Persistence characterization and data calibration scheme for the RSS-NIR H2RG detector on SALT

Mosby, Gregory; Eggen, Nathan; Wolf, Marsha J.; Jaehnig, Kurt P.; Kotulla, Ralf

doi:10.1117/12.2233227

Cited by 5 publications

(6 citation statements)

References 4 publications

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“…The digitized data are transferred from the SIDECAR to a PC relayed by a MACIE card via CameraLink. A timing controller receives the row clock from the MACIE card and controls the synchronous actions among polarization modulation, image acquisition, and data transfer remain after the reset operation (e.g., Mosby et al 2016), and which are also among the sources of noise on images.…”

Section: Overview Of the System And The Principle Of The Synchronous mentioning

confidence: 99%

A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

Hanaoka

Katsukawa

Morita

et al. 2020

Earth Planets Space

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Polarimetry is a crucial method to investigate solar magnetic fields. From the viewpoint of space weather, the magnetic field in solar filaments, which occasionally erupt and develop into interplanetary flux ropes, is of particular interest. To measure the magnetic field in filaments, high-performance polarimetry in the near-infrared wavelengths employing a high-speed, large-format detector is required; however, so far, this has been difficult to be realized. Thus, the development of a new infrared camera for advanced solar polarimetry has been started, employing a HAWAII-2RG (H2RG) array by Teledyne, which has $$2048~\times 2048$$ 2048 × 2048 pixels, focusing on the wavelengths in the range of $$1.0\;{-}\;1.6\;~\mu {\text{m}} $$ 1.0 - 1.6 μ m . We solved the problem of the difficult operation of the H2RGs under “fast readout mode” synchronizing with high-speed polarization modulation by introducing a “MACIE” (Markury ASIC Control and Interface Electronics) interface card and new assembly codes provided by Markury Scientific. This enables polarization measurements with high frame-rates, such as 29–117 frames per seconds, using a H2RG. We conducted experimental observations of the Sun and confirmed the high polarimetric performance of the camera.

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Section: Overview Of the System And The Principle Of The Synchronous mentioning

confidence: 99%

A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

Hanaoka

Katsukawa

Morita

et al. 2020

Earth Planets Space

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“…Nevertheless, the CDS lowers the frame rate and increases the dead time. Another shortcoming is the residual image or persistency due to the residual photoelectrons, which remain after the reset operation (e.g., Mosby et al 2016), and which are also among the sources of noise on images. It is known that a single reset operation cannot completely drain out the photoelectrons accumulated during the exposure.…”

Section: Overview Of the System And The Principle Of The Synchronous mentioning

confidence: 99%

A HAWAII-2RG Infrared Camera Operated Under Fast Readout Mode for Solar Polarimetry

Hanaoka

Katsukawa

Morita

et al. 2020

Preprint

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Abstract Polarimetry is a crucial method to investigate solar magnetic elds. From the viewpoint of space weather, the magnetic eld in solar laments, which occasionally erupt and develop into interplanetary ux ropes, is of particular interest. To measure the magnetic eld in laments, high-performance polarimetry in the near-infrared wavelengths employing a high-speed, large-format detector is required; however, so far, this has been difficult to be realized. Thus, the development of a new infrared camera for advanced solar polarimetry has been started, employing a HAWAII-2RG (H2RG) array by Teledyne, which has 2048 2048 pixels, focusing on the wavelengths in the range of 1.0{1.6 m. We solved the problem of the difficult operation of the H2RGs under \fast readout mode" synchronizing with high-speed polarization modulation by introducing a \MACIE" (Markury ASIC Control and Interface Electronics) interface card and new assembly codes provided by Markury Scientic. This enables polarization measurements with high frame-rates, such as 29{117 frames per seconds, using a H2RG. We conducted experimental observations of the Sun and conrmed the high polarimetric performance of the camera.

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“…Modelled behavior of image persistence has been used to plan observations and place operational restrictions on what astronomical sources may be observed, 6,10 and the ultimate goal is to model persistence accurately enough so that it may be corrected for in astronomical images. To our knowledge, the only instrument currently implementing a standard correction for image persistence is the WFC3cam on Hubble, which uses the model developed in Long et al 9 The correction model is based on the power-law decay model with a limited range of time validity, and a user who suspects image persistence is contaminating their data must request that a persistence map be specifically created for their data, requiring human intervention for each dataset that must be corrected.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors have worked to characterize the appearance and decay of persistence as a function of flux and fluence to develop phenomenological models to correct persistence in astronomical data. Mosby et al 6 and Leisenring et al 7 characterized time constants of persistence decay in the SALT RSS-NIR and JWST NIRCam detectors and found that 2-and 3-exponential decay models respectively described the persistence decay well, potentially pointing to 2 or 3 distinct trap populations. Other phenomenological models exist indicating that a power-law decay model fits the data well 8,9 indicating that a large range of trapping time constants are responsible for the observed persistence.…”

Section: Introductionmentioning

confidence: 99%

Predictive model of persistence in H2RG detectors

Tulloch¹,

George²

2019

J. Astron. Telesc. Instrum. Syst.

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Infrared hybridized detectors are widely used in astronomy, and their performance can be degraded by image persistence. This results in remnant images that can persist in the detector for many hours, contaminating any subsequent low-background observations. A different but related problem is reciprocity failure whereby the detector is less sensitive to low flux observations. It is demonstrated that both of these problems can be explained by trapping and detrapping currents that move charge back and forward across the depletion region boundary of the photodiodes within each pixel. These traps have been characterized in one 2.5 µm and two 5.3 µm cutoff wavelength Teledyne H2RG detectors. We have developed a behaviour model of these traps using a 5-pole Infinite Impulse Response digital filter. This model allows the trapped charge in a detector to be constantly calculated for arbitrary exposure histories, providing a near real-time correction for image persistence.

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Persistence characterization and data calibration scheme for the RSS-NIR H2RG detector on SALT

Cited by 5 publications

References 4 publications

A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

A HAWAII-2RG Infrared Camera Operated Under Fast Readout Mode for Solar Polarimetry

Predictive model of persistence in H2RG detectors

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