کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1538614 996617 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation on an evanescent wave fiber-optic absorption sensor based on fiber loop cavity ring-down spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Investigation on an evanescent wave fiber-optic absorption sensor based on fiber loop cavity ring-down spectroscopy
چکیده انگلیسی

An improved ring-down measurement principle for optical waveguides is presented. Fiber loop ring-down spectroscopy allows for measurement of minute optical losses in high-finesse fiber-optic cavities and immunity to the fluctuation of laser source. The evanescent wave absorption losses dependent on the absorption and the refractive index of ambient solution have been theoretically analyzed. The complex refractive index is introduced into our model and extinction coefficient can be calculated accurately through finite element analysis by setting the boundaries of the fiber and the ambient conditions. Using this method, the refractive index of environment can be taken into consideration. Our principle is validated by the highly-sensitive measurement of evanescent wave absorption loss. By chemically processing the surface of sensing segment along an extending ring-down cavity, the concentration of small volume Diethyl Sulphoxide solution where the etched fiber immersed into has been successfully measured and discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 283, Issue 2, 15 January 2010, Pages 249–253
نویسندگان
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