title: Influence of roughness in the phase-shifting speckle method: an experimental study with applications.
abstract: In this paper, a quantification of the influence of roughness in the phase-shifting speckle technique (phase-difference) is presented. For this purpose, a series of experiments were carried out on calibrated samples of different roughness varying the equivalent wavelength Λ, by combining the wavelengths of an argon-ion laser. In order to use this method correctly, on the basis of the phase fringe contrast, a criterion for the minimal Λ (limit) needed for a specific roughness is given. Besides, considering the investigated relation between roughness and effective wavelength as an inverse problem, a procedure to measure the roughness of a surface is proposed. Laboratory experiments to prove the validity of the method are shown.
authors: Lehrstuhl für Messsystem- und Sensortechnik, Theresienstrasse 90, 80333 München, Germany.
authors: N
authors: N
authors: Werth
authors: Departamento de Fisica Aplicada, ETSI Minas, Universidad Politécnica de Madrid, Rios Rosas 21, 28003 Madrid, Spain.
authors: F
authors: F
authors: Salazar-Bloise
authors: Lehrstuhl für Messsystem- und Sensortechnik, Theresienstrasse 90, 80333 München, Germany.
authors: A
authors: A
authors: Koch