Methods for Determining Crack Depth, Open PDF Document Details Document Type Technical Report Publication Date Mar 21, 1991 Accession Number ADA234799 Entities People Qianyuan He Organizations National Air and Space Intelligence Center Tags Communities of Interest Air Platforms DTIC Thesaurus Topics Amplitude Crack Tips Cracks Curvature Detection Equations Fluorescent Screens Foreign Technology Intensity Measurement Pressure Distribution Reflection Scanning Sound Pressure Surface Waves Translations Waves