FIBER OPTICAL MEASURING DEVICE FOR MEASURING ELECTRICAL ANDMAGNETIC QUANTITIES BY LATERALLY CONTROLLED PHOTO-LUMINESCENCE

摘要

A fiber optical measuring device for measuring primarily electric voltage or magnetic field, comprises a transducer having a sensor element, the transducer being connected by means of at least one optical fiber to a measuring electronic unit provided with at least two light sources having different emission spectra for excitation of photo-luminescence in the sensor element and at least one photo-detector for detection of photoluminescene emanating from the sensor element. The sensor element includes at least one luminescent layer arranged so that light from said optical fiber is arranged to fall towards the surface of the layer. Between the end surface of the optical fiber in the transducer and the surface of the luminescent layer, there is arranged at least one optical filter perpendicular to the ray path of the light. The luminescent layer is provided with at least two electrodes to generate, in the layer, a lateral electric field for the purpose of accelerating charge carriers which are excited by light emitted from the measuring electronic unit and transmitted to the luminescent layer via the optical fiber and through at least one of the filters.