TY - JOUR N2 - In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated. L1 - http://journals.pan.pl/Content/89931/PDF/Journal10178-VolumeXIX%20Issue2_17paper.pdf L2 - http://journals.pan.pl/Content/89931 PY - 2012 IS - No 2 EP - 380 DO - 10.2478/v10178-012-0032-9 KW - roughness KW - speckle KW - non-destructive testing A1 - Salazar, F. A1 - Belenguer, T. A1 - GarcĂ­a, J. A1 - Ramos, G. PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2012 T1 - On Roughness Measurement by Angular Speckle Correlation SP - 373 UR - http://journals.pan.pl/dlibra/publication/edition/89931 T2 - Metrology and Measurement Systems ER -