Unidirectional laser oblique illumination (ULOI): a comparison with partial dark field illumination (PDFI) in the optical microscopy of metals |
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| Authors: | F Povolo A Canzian E Favret |
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| Institution: | 4The authors are at the Universidad de Buenos Aires; Facultad de Ciencias Exactas y Naturales; Dto. de Física; Pabellón 1; Ciudad Universitaria; 1428 Buenos Aires; Argentina;1FP is also with the Comisión Nacional de Energía Atómica; Unidad de Actividad Materiales; Av. del Libertador 8250; 1429 Buenos Aires; Argentina;2FP and EF are also with Consejo Nacional de Investigaciones Científicas y Técnicas; Buenos Aires; Argentina;3AC is also in the Facultad Regional Pacheco; Universidad Tecnológica Nacional; H. Yrigoyen 288; 1617 Gral. Pacheco; Bs. As.; Argentina |
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| Abstract: | Some metallographic observations of the surface of polycrystalline specimens in an optical microscope illuminated with a HeNe laser beam; at oblique incidence; are compared with observations with white light also at oblique incidence. It is shown that similar effects are obtained in both cases; however; the width of the maximum in the dispersed intensity is narrower in the case of illumination with the laser beam. In addition; this kind of illumination permits us to distinguish distinct angular directions of the surface roughness. |
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| Keywords: | laser metallography partial dark field illumination optical microscopy of metals |
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