FIELD: automatics; measurement technology. SUBSTANCE: fiber-optic system has irradiator, n fiber-optic detectors and photodetector which has output connected with processing unit; all the units of the system are connected in series by means of cuts of fiber light guides. Each fiber-optic detector is made in form of transmission type detector and has a capability of discrete change of transparence factor of optical radiation from Ki to 1.0, where i=1,2,3...n. Transmission factors of the detectors differ. They are not equal to zero. EFFECT: improved precision of measurement. 1 dwg
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