TY - JOUR T1 - Basic physical principles of defocused speckle photography: a tilt topology inspection technique JO - Optics & Laser Technology PY - 1976/10/01 AU - Gregory DA ED - DO - DOI: 10.1016/0030-3992(76)90004-9 PB - Elsevier VL - 8 IS - 5 SP - 201 EP - 213 Y2 - 2026/03/14 ER -