Precise Throughput Determination of the PanSTARRS Telescope and the Gigapixel Imager using a Calibrated Silicon Photodiode and a Tunable Laser: Initial Results

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Precise Throughput Determination of the PanSTARRS Telescope and the Gigapixel Imager using a Calibrated Silicon Photodiode and a Tunable Laser: Initial Results

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Title: Precise Throughput Determination of the PanSTARRS Telescope and the Gigapixel Imager using a Calibrated Silicon Photodiode and a Tunable Laser: Initial Results
Author: Lykke, Keith; Woodward, John; Tonry, John; Stubbs, Christopher William; Doherty, Peter Edward; Cramer, Claire; Narayan, Gautham Siddharth; Brown, Yorke

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Citation: Stubbs, Christopher W., Peter Doherty, Claire Cramer, Gautham Narayan, Yorke J. Brown, Keith R. Lykke, John T. Woodward, and John L. Tonry. 2010. Precise throughput determination of the PanSTARRS telescope and the gigapixel imager using a calibrated silicon photodiode and a tunable laser: initial results. The Astrophysical Journal Supplement Series 191(2): 376.
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Abstract: We have used a precision calibrated photodiode as the fundamental metrology reference in order to determine the relative throughput of the PanSTARRS telescope and the Gigapixel imager, from 400 nm to 1050 nm. Our technique uses a tunable laser as a source of illumination on a transmissive flat-field screen. We determine the full-aperture system throughput as a function of wavelength, including (in a single integral measurement) the mirror reflectivity, the transmission functions of the filters and the corrector optics, and the detector quantum efficiency, by comparing the light seen by each pixel in the CCD array to that measured by a precision-calibrated silicon photodiode. This method allows us to determine the relative throughput of the entire system as a function of wavelength, for each pixel in the instrument, without observations of celestial standards. We present promising initial results from this characterization of the PanSTARRS system, and we use synthetic photometry to assess the photometric perturbations due to throughput variation across the field of view.
Published Version: doi://10.1088/0067-0049/191/2/376
Other Sources: http://arxiv.org/abs/1003.3465v1
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10246892
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