Proceedings of the Society of Photo-optical Instrumentation Engineers Proceedings of the Society of Photo-optical Instrumentation Engineers, Proceedings of the Society of Photo-optical Instrumentation Engineers. Proceedings of the Society of Photo-optical Instrumentation Engineers ; Proceeding of the Society of Photo-optical Instrumentation Engineers ; Proceedings of the Society of Photo-Optical Instrumentation Engineers ; Proceedings of the Society of Photo-optical Instrumentation Engineers, ; Proceedings of the Society of Photo-optical Instrumenation Engineers ; Proceedings of the Society of Photo-optical Instrumentation Engineers, v. 27. Proceedings of the Society of Photo-optical Instrumentation Engineers ; v. 184