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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Bibliographic Details
Published in:Optics and laser technology 1997-03, Vol.29 (2), p.67-73
Main Authors: Povolo, F., Canzian, A., Favret, E.
Format: Article
Language:English
Subjects:
Conventional optical microscopes
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
laser metallography
Optical instruments, equipment and techniques
optical microscopy of metals
partial dark field illumination
Physics
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Summary: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.
ISSN:0030-3992
1879-2545
DOI:10.1016/S0030-3992(96)00043-6