Spectrophotometric calibration system for DECam

J.-P. Rheault; D. L. DePoy; T. W. Behm; E. W. Kylberg; Kris Cabral; Rick Allen; J. L. Marshall

doi:10.1117/12.857411

20 July 2010 Spectrophotometric calibration system for DECam

J.-P. Rheault, D. L. DePoy, T. W. Behm, E. W. Kylberg, Kris Cabral, Rick Allen, J. L. Marshall

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 773564 (2010) https://doi.org/10.1117/12.857411
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

J.-P. Rheault, D. L. DePoy, T. W. Behm, E. W. Kylberg, Kris Cabral, Rick Allen, and J. L. Marshall "Spectrophotometric calibration system for DECam", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773564 (20 July 2010); https://doi.org/10.1117/12.857411

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available