Article (Scientific journals)
Calibration and testing of wide-field UV instruments
Frey, Harald; Mende, Stephen; Loicq, Jerôme et al.
2017In Journal of Geophysical Research. Space Physics, 122, p. 6907-6921
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Keywords :
ultraviolet; Space instrument; Calibration
Abstract :
[en] As with all optical systems the calibration of wide-field ultraviolet (UV) systems includes three main areas: sensitivity, imaging quality, and imaging capability. The one thing that makes UV calibrations difficult is the need for working in vacuum substantially extending the required time and effort compared to visible systems. In theory a ray tracing and characterization of each individual component of the optical system (mirrors, windows, and grating) should provide the transmission efficiency of the combined system. However, potentially unknown effects (contamination, misalignment, and measurement errors) can make the final error too large and unacceptable for most applications. Therefore, it is desirable to test and measure the optical properties of the whole system in vacuum and compare the overall response to the response of a calibrated photon detector. A proper comparison then allows the quantification of individual sources of uncertainty and ensures that the whole instrument performance is within acceptable tolerances or pinpoints which parts fail to meet requirements. Based on the experience with the IMAGE Spectrographic Imager, the Wide-band Imaging Camera, and the ICON Far Ultraviolet instruments, we discuss the steps and procedures for the proper radiometric sensitivity and passband calibration, spot size, imaging distortions, flatfield, and field of view determination.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Frey, Harald;  Berkeley University of California - UC Berkeley > Space Sciences Laboratory
Mende, Stephen;  Berkeley University of California - UC Berkeley > Space Sciences laboratory
Loicq, Jerôme ;  Université de Liège > CSL (Centre Spatial de Liège)
Habraken, Serge ;  Université de Liège > Département de physique > Optique - Hololab
Language :
English
Title :
Calibration and testing of wide-field UV instruments
Publication date :
May 2017
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Wiley, Hoboken, United States - New Jersey
Special issue title :
Measurement Techniques in Solar and Space Physics: Photons
Volume :
122
Pages :
6907-6921
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 July 2017

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