Accession Number : AD0722320

Title :   Size and Distance Estimation from an Acrylic Submersible.

Descriptive Note : Final rept.,

Corporate Author : NAVAL PERSONNEL AND TRAINING RESEARCH LAB SAN DIEGO CALIF

Personal Author(s) : Eversole,Charles L.

Report Date : MAR 1971

Pagination or Media Count : 39

Abstract : In an experimental evaluation of the visual properties of NEMO, a 5.5 foot diameter acrylic submersible, it was found that size and distance of underwater targets (white discs) were dramatically underestimated. In many cases this underestimation was in excess of 50% of the true size and/or distance. This result however, is in partial agreement with theoretical predictions established for the optical properties of NEMO. The results of this experiment differ from theory in that error rates (amount of underestimation) maximize at distances of 20-30 feet, whereas theory predicts an increase in errors (underestimation) to much further distances. Several reasons are offered for this discrepancy, including water turbidity, individual set or bias, and the effect of experience. It appears that with training which includes accurate information on true target size and distance, operators can accurately estimate size and distance. (Author)

Descriptors :   (*ACRYLIC RESINS, VISUAL ACUITY), (*SUBMARINE HULLS, ACRYLIC RESINS), (*UNDERWATER VEHICLES, SUBMARINE HULLS), TRANSPARENT PANELS, ERRORS, NAVAL TRAINING, MATHEMATICAL PREDICTION, PERFORMANCE(HUMAN), DIVING, SPHERES

Subject Categories : Plastics
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE