Unidirectional laser oblique illumination (ULOI): A comparison with partial dark field illumination (PDFI) in the optical microscopy of metals
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; howe...
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| Autores principales: | , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00303992_v29_n2_p67_Povolo |
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| Sumario: | 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. © 1997 Elsevier Science Ltd. All rights reserved. |
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