Speckle revisited: analysis of speckle noise in bar-code scanning systems

Emanuel Marom; Sasa Kresic-Juric; Leonard Bergstein

doi:10.1117/12.432867

29 June 2001 Speckle revisited: analysis of speckle noise in bar-code scanning systems

Emanuel Marom, Sasa Kresic-Juric, Leonard Bergstein

Proceedings Volume 4430, ROMOPTO 2000: Sixth Conference on Optics; (2001) https://doi.org/10.1117/12.432867
Event: ROMOPTO 2000: Sixth Conference on Optics, 2000, Bucharest, Romania

Abstract

Laser beams used for bar-code scanning exhibit speckle noise generated by the roughness of the surface on which bar-codes are printed. Statistical properties of a photodetector signal that integrates a time-varying speckle pattern falling on its aperture are analyzed in detail. We derive simple closed form expressions for the auto-correlation function and power spectral density of the detector current for general form scanning beams with arbitrary field distributions. Theoretical calculations are illustrated by numerical simulations.

Citation Download Citation

Emanuel Marom, Sasa Kresic-Juric, and Leonard Bergstein "Speckle revisited: analysis of speckle noise in bar-code scanning systems", Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); https://doi.org/10.1117/12.432867

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