In this work we present an optical system for the supervision of the operation of an induction motor. We used a Mach-
Zehnder interferometer and cyclic interferometer for the measurement of the vibrations produced by the motor motion
and obtain a frequency spectrum via a Fourier transform of the signal. According to the spectrum, we can know the
operation conditions of the induction motor. The optical system consist of the Interferometer, a data acquisition board
and virtual instrument.
The optical anisotropy of a semiconductor surface can have different origins, such as, local-field effects, the electro-optics effect, reconstruction, surface dislocations, and surface roughness. A comprehensive, quantitative picture on how these effects are related to surface optical anisotropies (SOA) can now be obtained thanks to the progress in the modeling of optical properties of surfaces. Linear optical spectra can now be calculated very accurately even for large and complex surface structures. This allows a much better understanding of the origin of specific SOA. In this paper we make a review focused on the microscopic origin of SOA and the present state of the art in the study of reflectance anisotropy spectroscopy of semiconductor surfaces.
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