VERFAHREN ZUR MESSUNG DER SPEZIFISCHEN KRUEMMUNGSABHAENGIGEN DAEMPFUNGSERHOEHUNG EINES LWL.

摘要

The attenuation measuring device uses a stabilised light source coupled to one end (3) of the optical fibre (1), its opposite end (7) fixed relative to a photodetector (8). The intermediate optical fibre length. The attenuation of the optical signal is measured with a relatively small and a relatively large number of windings around the drum (6), the measurements evaluated to calculate the attenuation due to the optical fibre curvature. Pref. the optical fibre (1) is fed from a supply drum with a larger dia. to the winding drum (6).