A video technique for the quantitative analysis of the Poisson spot and other diffraction patterns

A new approach is presented for the observation and analysis of diffraction phenomena. Using the discussed procedures, direct comparison between measu red light intensity and theoretical predictions is possible. A modified ver sion of a Poisson spot experiment where the resulting diffraction pattern i s recorded by a Sanyo vidicon camera is presented. A double slit experiment is also discussed, demonstrating the quantitative possibilities while addr essing detector linearity. A video signal is connected directly to a comput er and analyzed using public domain software. This is an excellent arrangem ent for demonstrations, student labs, or a more general diffraction experim ent. (C) 1999 American Association of Physics Teachers.