CGS4 experience: two years later

Gillian S. Wright; C. Matt Mountain; Alan Bridger; Philip N. Daly; Joanne L. Griffin; Suzanne K. Ramsay-Howat

doi:10.1117/12.158706

20 October 1993 CGS4 experience: two years later

Gillian S. Wright, C. Matt Mountain, Alan Bridger, Philip N. Daly, Joanne L. Griffin, Suzanne K. Ramsay-Howat

Proceedings Volume 1946, Infrared Detectors and Instrumentation; (1993) https://doi.org/10.1117/12.158706
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

First light with the advanced cooled grating spectrometer (CGS4) was achieved at the United Kingdom Infrared Telescope on February 4, 1991 following successful delivery of the instrument from the Royal Observatory, Edinburgh. We discuss the performance of CGS4 and summarize our experience in maintaining optimum array sensitivity. CGS4 is unique in that both the data acquisition and reduction can be almost completely automated, and the key elements of the software and their impact on observing are described. We discuss how various aspects of CGS4 such as the reproducibility of flat fields relate to the ability to provide users with flat-fielded, sky-subtracted spectra almost in real-time. We also discuss the problems of the variability of OH line emission and atmospheric transmission and describe the sky subtraction techniques which we have been using both at the telescope and in post observing analysis.

Citation Download Citation

Gillian S. Wright, C. Matt Mountain, Alan Bridger, Philip N. Daly, Joanne L. Griffin, and Suzanne K. Ramsay-Howat "CGS4 experience: two years later", Proc. SPIE 1946, Infrared Detectors and Instrumentation, (20 October 1993); https://doi.org/10.1117/12.158706

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