Photometric calibrations of the AFP-675 far-ultraviolet cameras experiment

George R. Carruthers; Brian C. Dohne; Kevin K. Shephard; Susan A. Christe Reeb; Edward G. Schmidt

doi:10.1117/12.186612

14 September 1994 Photometric calibrations of the AFP-675 far-ultraviolet cameras experiment

George R. Carruthers, Brian C. Dohne, Kevin K. Shephard, Susan A. Christe Reeb, Edward G. Schmidt

Proceedings Volume 2282, Ultraviolet Technology V; (1994) https://doi.org/10.1117/12.186612
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The far ultraviolet cameras experiment (NRL-803), part of the U.S. Air Force Space Test Program's AFP-675 payload, flew aboard the space shuttle Discovery in April - May 1991 (STS-39). While in orbit, the experiment gathered data about sources of far-ultraviolet radiation in near-Earth and distant space. To obtain quantitative information from the data, pre-flight and post-flight calibrations of the flight instruments were required. Calibrations were performed using a vacuum-UV optical collimator and two types of light sources: (a) a vacuum-UV monochromator, whose output wavelength could be varied over the wavelength range 105 - 200 nm; and (b) gas discharge tubes with interference-filter windows, giving monochromatic output at selected wavelengths within this range. Calibrations were of two types (the first performed only before flight): (a) using the far UV cameras as photodiodes; and (b) using the cameras to record images on film, as during flight. In addition, in-flight calibrations are obtained from observations of hot stars or other sources which have been measured by previous space experiments. Results from the calibrations are used to derive absolute far-UV brightnesses of objects from the actual flight data.

Citation Download Citation

George R. Carruthers, Brian C. Dohne, Kevin K. Shephard, Susan A. Christe Reeb, and Edward G. Schmidt "Photometric calibrations of the AFP-675 far-ultraviolet cameras experiment", Proc. SPIE 2282, Ultraviolet Technology V, (14 September 1994); https://doi.org/10.1117/12.186612

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