Detection of Material Properties using Laser Optics

Detection of Material Properties using Laser Optics

Bibliographic Details
Main Author: Bhetwal, Lalita
Language:English
Published: University of Akron / OhioLINK 2011
Subjects:
Electrical Engineering
Laser Optics
refractive index
permittivity
conductivity
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1323466634
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron13234666342021-08-03T05:26:49Z Detection of Material Properties using Laser Optics Bhetwal, Lalita Electrical Engineering Laser Optics refractive index permittivity conductivity <p>This thesis presents a method for detection of material properties such as refractive index, permittivity and conductivity of a remote object by using laser beams. The method is demonstrated for planar dielectric media in which properties of reflected and refracted wave information is known via Snell’s law. The reflection coefficient ofa laser beam on an object is shown to depend on the angle of incidence, the beam frequency and material constants such as electrical permittivity and conductivity. By measuring the intensities of the incident and the reflected waves, reflection coefficients are determined. The reflection coefficient is then used to calculate the refractive index of the material at an accurate level. By varying the parameters such as the angle of incidence and the beam frequency, non-linear complex polynomial equations areobtained which are solved to estimate the unknown conductivity and permittivity of the medium.</p><p>The results are generalized and applied to rough surfaces which are referred to as diffuse media. In this case, only partial information of the reflected field can be obtained. This partial information yields a scaling factor ‘s’, which we have termed as the diffuse parameter. Finally, by constructing appropriate numbers of nonlinearequations, the permittivity, the conductivity and the diffuse parameter are determined.</p><p>The estimation of the material properties, made from the proposed method,are verified through experimental results. To achieve this, a series of experiments are carried out in which the angle of incidence is changed with fixed frequency of the incident wave and vice versa. Low power laser sources with wavelengths typicallybetween 400 and 900 nm are used for these applications. Refractive index, electrical permittivity and conductivity of an aluminium sheet are measured through the experiment. The experimental results and the theoretical results are observed to vary by less than 10%. This work realized successfully that optical and electrical properties of materials can be calculated directly through laser applications.</p> 2011-12-21 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1323466634 http://rave.ohiolink.edu/etdc/view?acc_num=akron1323466634 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Electrical Engineering
Laser Optics
refractive index
permittivity
conductivity
spellingShingle Electrical Engineering
Laser Optics
refractive index
permittivity
conductivity
Bhetwal, Lalita
Detection of Material Properties using Laser Optics
author Bhetwal, Lalita
author_facet Bhetwal, Lalita
author_sort Bhetwal, Lalita
title Detection of Material Properties using Laser Optics
title_short Detection of Material Properties using Laser Optics
title_full Detection of Material Properties using Laser Optics
title_fullStr Detection of Material Properties using Laser Optics
title_full_unstemmed Detection of Material Properties using Laser Optics
title_sort detection of material properties using laser optics
publisher University of Akron / OhioLINK
publishDate 2011
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1323466634
work_keys_str_mv AT bhetwallalita detectionofmaterialpropertiesusinglaseroptics
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