A device to characterize optical fibres
F.Bosi, S.Burdin, V.Cavasinni, D.Costanzo, T.Del Prete, V.Flaminio, E.Mazzoni, C.Roda, G.Usai, A.Vasiljev
Abstract
ATLAS is a general purpose experiment approved for the LHC collider at CERN. An important component of the detector is the central hadronic calorimeter; for its construction more than 600,000 Wave Length Shifting (WLS) fibres (corresponding to a total length of 1,120 Km) have been used.
We have built and put into operation a dedicated instrument for the measurement of light yield and attenuation length over groups of 20 fibres at a time.
The overall accuracy achieved in the measurement of light yield
(attenuation length) is 1.5% (3%).
We also report the results obtained using this method in the quality control of a large sample of fibres.