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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 733-736 |
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Moradpour , Bahrami M. Numerical study of the relationship between the radius change of laser beams and their diffuse reflections from the surface of a living tissue. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :733-736
URL: http://opsi.ir/article-1-2467-en.html
URL: http://opsi.ir/article-1-2467-en.html
1- Department of Physics, Science Faculty, University of Lorestan, Khorramabad
Abstract: (1249 Views)
Using the Monte Carlo method, the present study deals with the diffuse reflectance of laser light from the surface of a tissue, and its relationship with the radius change of the laser beams. At first, there was a comparison, in terms of fractional flux densities output from the tissue surface, between two Gaussian beams, one with an extremely small width and the other with a radius of 0.2 cm. Then, there was a calculation, in terms of the magnitudes of the fractional flux densities output from the tissue surface, for beams with radii of 0.1, 0.2, 0.4, 0.6, 0.8, and 1 cm in two states. In the first case, the radial distance from the center of the incident beam is assumed to be constant at r = 0.4 cm, but the exit angle of the photons is variable. In the second case, however, the angle is considered to be constant (equal to 30°), although the radial distance changes. Findings show that in the first case, the beam with a radius of 0.4 cm has the highest fractional flux density distribution, but in the second case, the output fractional flux density decreases nearly before the radial distance r = 0.2 cm, although after that, the trend is reversed.
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