AN INVESTIGATION OF TARGET ENHANCEMENT THROUGH USE OF A MULTI-PHOSPHOR CATHODE RAY TUBE.
Abstract
Utilizing a specially manufactured multi-phosphor cathode-ray tube (CRT), this study investigated the hypothesis that target detectability on a simulated radar/sonar-type display is enhanced if the target abruptly changes color as it moves across the display. A secondary objective of the study was to obtain information on the relative detectability of the target in each of the eight phosphors tested. The task for each of 52 Navy sonar school students was the detection of a moving target imbedded in visual noise. The special design multi-phosphor CRT contained eight commonly used radar and television phosphors arranged in wedge-shaped sectors around the tube face. The subjects task was to scan the entire tube face during the brief period of target presentation and to determine in which phosphor the target appeared. The test consisted of 64 trials during which two experimental conditions were presented on alternate trials. Under one set of conditions, the target appeared at a sector boundary and moved 45 degrees to an adjacent sector boundary, entirely within a given phosphor color. Under the alternate set of conditions, the target appeared at the medial line of a sector and moved to the medial line of an adjacent sector, resulting in an abrupt change of color midway in the target path. The major sources of variance tested were: (a) color-change/no-color-change, (b) orientation of the tube face, (c) phosphor differences, and (d) clockwise/counterclockwise rotation of the target. The results of the study showed that the no-color-change condition enhanced detectability when compared to the color-change condition. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 05, 1967
- Accession Number
- AD0652980
Entities
People
- R. S. French