Physics – Physics Education
Scientific paper
2006-10-12
Physics
Physics Education
Report of a student practicum. 21 pages pdf, with color figures. v2: Corrected some font errors
Scientific paper
Buchanan et al. [Nature 436, p. 475 (2005)] have shown that it is possible to recognize paper samples via their speckle pattern by using a line-shaped laser focus, four photo detectors and a scanning mechanism. In this report recognition of five out of ten paper samples is presented. The sample was illuminated by a 2.62 +- 0.02 mm circular spot and the reflected light was measured by a static CCD. We have formulated a criterion for recognition that limits the probability of false recognition to 0.1 % for the experiment with ten samples. We obtained results that show that the probability of false recognition will be negligible for a large amount of samples. The properties of speckle originating from a line and a spot illumination source have been compared to see whether the use of a line results in major advantages for the recognition of samples.
Beijnum van F.
der Molen Karen L. van
Mosk Allard P.
van Putten Elbert G.
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