VIDEO RECORDING SYSTEM FOR INSPECTION OF LARGE STRUCTURES. FINAL TECHNICAL REPORT

A significant change in the last few years is the increase in resolution, and the decrease in required illumination level of video image recordings. These developments are the basis of this research. The results indicate that video recordings are suitable for inspection of portions of structures, particularly those which are inaccessable, in deep shadows or underwater. Using f=16-160mm zoom optics, the recording distance is 5-150 ft and 3-6 ft underwater. System resolution is satisfactory. It is possible to form images in nearly complete darkness (night time). Therefore, structures in deep shadows can be inspected. It is recommended that video-recording augment visual inspections after certain modifications.