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Proceedings Paper

Spectrophotometric calibration system for DECam
Author(s): J.-P. Rheault; D. L. DePoy; T. W. Behm; E. W. Kylberg; Kris Cabral; Rick Allen; J. L. Marshall
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Paper Abstract

We present a spectrophotometric calibration system that will be implemented as part of the DES DECam project at the Blanco 4 meter at CTIO. Our calibration system uses a 2nm wide tunable source to measure the instrumental response function of the telescope from 300nm up to 1100nm. The system consists of a monochromator based tunable light source that is projected uniformly on a Lambertian screen using a broadband "line to spot" fiber bundle and an engineered diffuser. Several calibrated photodiodes strategically positioned along the beam path will allow us to measure the throughput as a function of wavelength. Our system has an output power of 0.25 mW, equivalent to a flux of approximately 100 photons/s/pixel on DECam. We also present results from the deployment of a prototype of this system at the Swope 1m at Las Campanas Observatory for the calibration of the photometric equipment used in the Carnegie Supernova Project.

Paper Details

Date Published: 20 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773564 (20 July 2010); doi: 10.1117/12.857411
Show Author Affiliations
J.-P. Rheault, Texas A&M Univ. (United States)
D. L. DePoy, Texas A&M Univ. (United States)
T. W. Behm, Texas A&M Univ. (United States)
E. W. Kylberg, Texas A&M Univ. (United States)
Kris Cabral, Texas A&M Univ. (United States)
Rick Allen, Texas A&M Univ. (United States)
J. L. Marshall, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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