Abstract
A double spectrometer allows the precise measurement of the spectral attenuation length of scintillating fibers. Exciting the fibers with a N2-laser at different points and measuring the wavelength dependent light intensity on both ends of the fiber simultaneously, enables a measurement of the attenuation length which is practically independent of systematic uncertainties. The experimental setup can additionally be used for the measurement of the relative light output. Six types of scintillating fibers from four manufactures (Bicron, Kuraray, Pol.Hi.Tech, and Plastifo) were tested. For different fibers the wavelength dependent attenuation lengths were measured from 0.3 m up to 20 m with an accuracy as good as 1%.
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