Accession Number : AD0768339

Title :   Photographic Measurement of Particulate Surface Contamination.

Descriptive Note : Rept. for Oct 71-Oct 72,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF ENGINEERING SCIENCE OPERATIONS

Personal Author(s) : Hamberg,O.

Report Date : 31 JUL 1973

Pagination or Media Count : 50

Abstract : The particulate surface cleanliness of spacecraft is important to the proper functioning of certain spacecraft devices. The report reviews the limitations of some surface contamination measurements currently used, and shows how an approach based on the use of macrophotography has some inherent advantages over the usual methods for field measurement of assembled spacecraft. These advantages are that no contact with sensitive surfaces is required, the measurement is direct, and a permanent record is provided. The results of an experiment which compares particle visibility and sizing using 4X macrophotography with 37X photomicrography are provided. These results, based on the use of available equipment, indicated that macrophotography with non-optimized equipment provided reasonable accuracy down to 16 microns and that further refinement might allow the measurement of smaller particle sizes. (Author)

Descriptors :   (*SPACECRAFT COMPONENTS, DUST), PARTICLE SIZE, CONTAMINATION, MEASUREMENT, PHOTOGRAPHY, SURFACE PROPERTIES

Subject Categories : Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE