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Speckle in a thick diffuser.

Chang, Nien-An.

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Speckle in a thick diffuser.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Speckle in a thick diffuser./
作者:	Chang, Nien-An.
面頁冊數:	179 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: 6307.
Contained By:	Dissertation Abstracts International70-10B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3381704
ISBN:	9781109424751

Speckle in a thick diffuser.
Chang, Nien-An.

Speckle in a thick diffuser. - 179 p.

Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: 6307.

Thesis (Ph.D.)--University of Rochester, 2009.

Theory and experiments on speckle generated from a thick diffuser are presented in this thesis. An overview of speckle from a diffuser in a 4F optical processor gives a basic understanding of the speckle formation and properties. The speckle size depends on the F number of the system, while the interior properties of a diffuser are evident in the wavelength dependence of speckle. We then move on to analyzing speckle from a thick diffuser, which is composed of particles embedded in a host medium. Emphasis on the theory is placed on solving for the wavelength decorrelation of speckle in a thick diffuser. A brief overview of the scattering theory for a particle using the Lorenz-Mie theory is included. Then we present a careful analysis of the speckle created by propagation through a thick diffuser. In the analysis we use an angular spectrum approach that is valid in the non-paraxial case together with a decomposition of the thick diffuser into a cascade of many screens. This calculation is well-suited to numerical analysis and an original computer software program has been provided as an Appendix in this thesis. By adding the scattered field from the randomly-located particles on any screen and propagating through a free space between each screen, one can generate a speckled field after going through the whole cascade. The theoretical predictions are summarized and later compared with experimental results on a series of opal milk glass diffusers. In many practical applications it is particularly advantageous to have mild thick diffusers of controllable diffusivity. We have extensively studied a new diffuser series fabricated using polystyrene spheres of various diameters embedded in gelatin. Theory and experiments are in good agreement.

ISBN: 9781109424751Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Speckle in a thick diffuser.
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