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• f-number
• FBRM
• FCM
• FDTD
• FF
• FFF
• finite-difference time-domain
• FOV
• FSSP
• FTU
• FWHM

Finite-difference time-domain (FDTD) - a method of calculating scattering of electromagnetic waves by complex objects. In this method, Maxwell equations are solved in the time-domain by using an analogue to the finite-difference technique for solving differential equations. The method, in principle, can be applied to particle of any shape and size in any orientation and which posses arbitrary internal structure. See Taflove and Hagness 2005, Taflove and Umashankar 1989, as well as http://en.wikipedia.org/wiki/FDTD. [AJB, © Crown Copyright 2007].