A low-cost ultraviolet-to-infrared absolute quantum efficiency characterization system of detectors

Gill, Ajay; Shaaban, Mohamed M.; Tohuvavohu, A.; Sivanandam, Suresh; Abraham, Roberto; Chen, Seery; Drout, M. R.; Lokhorst, Deborah; Matzner, Christopher D.; Mochnacki, S. W.; Netterfield, C. B.

doi:10.48550/arxiv.2207.13052

Cited by 2 publications

(2 citation statements)

References 4 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We operate with modest thermoelectric cooling to -20C. The properties of the QHY600M are comparable to CCDs (Gill et al 2022, Betoule et al 2022, but offer frame rates up to 30 fps. We can detect light pulses having sub-second duration with minimal contamination from the background "noise" of stars, galaxies, and sky.…”

Section: Object-prism Observations Of the Milky Way Planementioning

confidence: 96%

A search for transient, monochromatic light from the Galactic plane

Marcy

Tellis²

2023

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The Galactic Plane was searched for transient, monochromatic light at optical and near-IR wavelengths to detect pulses shorter than 1 sec. An objective-prism Schmidt telescope of 0.28-meter aperture and a CMOS camera were used to observe 973 square degrees, with 8864 exposures of 1-sec each, within a strip 2.1 deg wide along the Galactic Plane, from Galactic longitude -4 deg to +248 deg. All exposures were analyzed for transient, monochromatic sources using a “difference image” algorithm that yielded 11 candidate sources. All 11 sources were found to be associated with either astrophysical emission-line objects or aircraft with sub-second blinking lights. Our survey “rediscovered” many Wolf-Rayet stars, M dwarf flare stars, and planetary nebulae. It also identified an aircraft, of unknown type, that apparently had a nearly monochromatic lamp and a xenon lamp. This survey would have revealed optical and near-IR pulses having a power of ∼180 GW (wavelength dependent) if emitted by a 10-meter aperture laser located 1 kiloparsec away. These non-detections of laser pulses from the Galactic Plane, including a 10-degree region toward the Galactic Centre, add to the non-detections from more than 5000 nearby stars. Indeed, all-sky surveys for emission-line objects (e.g., ionized gas, supernovae remnants, and active galactic nuclei) would have revealed lasers of a wide range of average brightness, wavelength, and cadence. The absence of beacons reveals more of a SETI desert, notably at the intensely surveyed optical and radio wavelengths.

show abstract

Section: Object-prism Observations Of the Milky Way Planementioning

confidence: 96%

A search for transient, monochromatic light from the Galactic plane

Marcy

Tellis²

2023

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…Our optics model matches the SuperBIT telescope (Romualdez et al 2020): a diffractionlimited 500 mm diameter telescope with 38% of the collecting area obscured by a secondary mirror, and a focal plane Gaussian jitter with σ = 0.05 . The first configuration of detector throughput (SuperBIT configuration) comprises the nominal SuperBIT science detector: the Sony IMX455 CMOS camera, with dark current of 0.002 electrons/s/pixel, read noise of 1.5 electrons/pixel, and sensitivity in the 300-900 nm range measured and presented in Gill et al (2022). The second configuration (flat configuration) is a fictional configuration with noise specifications identical to the SuperBIT configuration, but with a total transmission multiplied by quantum efficiency of 0.7 e − /photon, irrespective of wavelength.…”

Section: Instrument Specificationsmentioning

confidence: 99%

Weak lensing in the blue: a counter-intuitive strategy for stratospheric observations

Shaaban,

Gill,

McCleary

et al. 2022

Preprint

View full text Add to dashboard Cite

The statistical power of weak lensing measurements is principally driven by the number of highredshift galaxies whose shapes are resolved. Conventional wisdom and physical intuition suggest this is optimised by deep imaging at long (red or near-IR) wavelengths, to avoid losing redshifted Balmerbreak and Lyman-break galaxies. We use the synthetic Emission Line ('EL')-COSMOS catalogue to simulate lensing observations using different filters, from various altitudes. Here were predict the number of exposures to achieve a target z 0.3 source density, using off-the-shelf and custom filters. Ground-based observations are easily better at red wavelengths, as (more narrowly) are space-based observations. However, we find that SuperBIT, a diffraction-limited observatory operating in the stratosphere, should instead perform its lensing-quality observations at blue wavelengths.

show abstract

A low-cost ultraviolet-to-infrared absolute quantum efficiency characterization system of detectors

Cited by 2 publications

References 4 publications

A search for transient, monochromatic light from the Galactic plane

A search for transient, monochromatic light from the Galactic plane

Weak lensing in the blue: a counter-intuitive strategy for stratospheric observations

Contact Info

Product

Resources

About