Spectrophotometric calibration system for DECam

J.-P. Rheault; D. L. DePoy; J. L. Marshall; T. Prochaska; R. Allen; J. Wise; E. Martin; P. Williams

doi:10.1117/12.924774

24 September 2012 Spectrophotometric calibration system for DECam

J.-P. Rheault, D. L. DePoy, J. L. Marshall, T. Prochaska, R. Allen, J. Wise, E. Martin, P. Williams

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84466M (2012) https://doi.org/10.1117/12.924774
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

We describe a spectrophotometric calibration system that is being implemented as part of the DES DECam project at the Blanco 4 meter at CTIO. Our calibration system uses a 1nm wide tunable source to measure the instrumental response function of the telescope optics and detector from 300nm up to 1100nm. This calibration will be performed regularly to monitor any change in the transmission function of the telescope during the 5 year survey. The system consists of a monochromator based tunable light source that provides illumination on a dome flat that is monitored by calibrated photodiodes that allow us to measure the telescope throughput as a function of wavelength. Our system has a peak output power of 2 mW, equivalent to a flux of approximately 800 photons/s/pixel on DECam.

Citation Download Citation

J.-P. Rheault, D. L. DePoy, J. L. Marshall, T. Prochaska, R. Allen, J. Wise, E. Martin, and P. Williams "Spectrophotometric calibration system for DECam", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84466M (24 September 2012); https://doi.org/10.1117/12.924774

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