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Proceedings Paper

Camera/Photometer Results
Author(s): K. S. Clifton; J. K. Owens
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Paper Abstract

Efforts continue regarding the analysis of particulate contamination recorded by the Camera/Photometers on STS-2. These systems were constructed by Epsilon Laboratories, Inc. and consisted of two 16-mm photographic cameras, using Kodak Double X film, Type 7222, to make stereoscopic observations of contaminant particles and background. Each was housed within a pressurized canister and operated automatically throughout the mission, making simultaneous exposures on a continuous basis every 150 sec. The cameras were equipped with 18-mm f/0.9 lenses and subtended overlapping 20° fields-of-view. An integrating photometer was used to inhibit the exposure sequences during periods of excessive illumination and to terminate the exposures at preset light levels. During the exposures, a camera shutter operated in a chopping mode in order to isolate the movement of particles for velocity determinations. Calculations based on the preflight film calibration indicate that particles as small as 25 μm can be detected from ideal observing conditions. Current emphasis is placed on the digitization of the photographic data frames and the determination of particle distances, sizes, and velocities. It has been concluded that background bright-ness measurements cannot be established with any reliability on the STS-2 mission, due to the preponderance of Earth-directed attitudes and the incidence of light reflected from nearby surfaces.

Paper Details

Date Published: 12 April 1983
PDF: 4 pages
Proc. SPIE 0338, Spacecraft Contamination Environment, (12 April 1983); doi: 10.1117/12.933633
Show Author Affiliations
K. S. Clifton, NASA/Marshall Space Flight Center (United States)
J. K. Owens, NASA/Marshall Space Flight Center (United States)

Published in SPIE Proceedings Vol. 0338:
Spacecraft Contamination Environment
Carl R. Maag, Editor(s)

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