Video Method of Measuring Field-of-View of Electro-Optical Devices Versus Eye Clearances.
Abstract
A miniature charged couple device (CCD) video camera was used to determine the fields-of-view (FOV) with changes in viewing distances (vertex distance) for the standard 18-mm eyepiece ANVIS, a 25-mm eyepiece ANVIS, and two different diameter nonoptical apertures. The data were graphed and compared with theoretical and subjective values (Kotulak, 1992) for FOVs vs eye clearance for the standard 18-mm eyepiece ANVIS. The results indicate that the video camera used in this study approximates both the theoretical and subjectively measured FOV vs eye clearance functions with slight deviation. Computer generated ray traces and subjective assessment with the 25-mm eyepiece confirmed that the marginal rays for the maximum viewable FOVs were blocked at the designed eye position by the aperture on the back plate in front of the fiber optic twist of the intensifier tube. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1995
- Accession Number
- ADA298780
Entities
People
- William E. McLean
Organizations
- United States Army Aeromedical Research Lab