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. 1993 Jan-Feb;98(1):71–87. doi: 10.6028/jres.098.006

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 20 — A linear chopping device is illustrated at (a); the widths of the slot and the guide are both w and the chopping speed is u. The time dependence of the transmitted intensity is shown at (b). The burst time is (w/u) whereas the transmitted intensity is proportional to (w²/u).