NDLI: A low cost light diffuser made of metal coil

Content Provider	IEEE Xplore Digital Library
Author	Morita, Nozomi Arai, Tsunenori
Copyright Year	2008
Description	Author affiliation: School of fundamental Science and Technology, Graduate School of Science and Technology, Keio University (Japan) (Morita, Nozomi; Arai, Tsunenori)
Abstract	We proposed a low cost flexible light diffuser made of metal coil to obtain an appropriate light dose against certain laser therapies in narrow bending organs. We investigated experimentally the diffusion light dose of prototype coils made of stainless steel (sus304). We measured the diffusion light intensity of the prototype coils along the irradiation direction and the circumferential direction with the various pitch distances of the prototype coils and numerical aperture (NA) of laser light beam as the characteristic parameters of the light diffusion. We measured the temperature elevation of the prototype coils to study the waste energy of these prototype coils. The FWHM on the light intensity along the prototype coils marked up to 12.8mm with the constant pitch distance of 0.09mm and the fiber output light NA of 0.038. The FWHM on the light intensity was improved to 13.7mm with the composite pitch distance coils of which the pitch distances were 0.09mm in the proximate and 0.18mm in the distal. Since the efficiency of the diffusion irradiation against the fiber output was typically 7.7% in the prototype coils of which the surface reflectance was 50%, approximately 90% of the laser light energy was transferred to the temperature elevation. We estimated the practical diffusion efficiency around 75% using the high reflection of the prototype coils surface up to 90%.
Starting Page	4354
Ending Page	4357
File Size	321996
Page Count	4
File Format	PDF
ISBN	9781424418145
ISSN	1557170X
DOI	10.1109/IEMBS.2008.4650174
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-08-20
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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