Method and device for automatically compensating t

专利名称：Method and device for automatically

compensating the damping of a

measurement value transmission by meansof optical fibres

发明人：AMMANN, URS,DOBLER,

THOMAS,MASCHEK, MARTIN,MASTNER,GEORG, DR.

申请号：EP87115711.1申请日：19871027公开号：EP0267484A3公开日：190809

摘要：messwertsignale (s1), such as a beeper in the hochspannungspotential islocated, a signaler on (1) with an emitting (6) on the hochspannungsseite on a light (8) toa signalempf\änger (9) with a photodiode (10) to be transferred to the ground. anoptical signald\ämpfung are en route.an automatic d\ämpfungskompensationboth for change and for gleich\­spannungsmessignale (s1) to ensure the emitting(6) a reference direct current (iref) were repatriated. before each measurement is acomparison of the transmission system.it is an amplifier (4) of the signalsendersterrestrial (1) via a switch (3) with a reference potential (1.40) and the gain of thesignalempf\ängers (9) arranged so that its output signal (s9) is equal to a specificver\­gleichsspannung (uref). the output signal (sky) of a differenzverst\ärkers(14) via a low pass filter (16) and a 1.nachverst\ärker (17), a momentanwert memory(18) into the output signal (s18) verst\ärkungs\­faktor controls. after reaching

the aligned state of the control circuit is interrupted, so that the gain to a new alignmentremains constant.the verst\är\­kungsfaktor can electrically or opticallycontrollable resistance, electro-mechanical or a multiplier or the tensioning of anavalanche photodiode (10).

申请人：BBC BROWN BOVERI AKTIENGESELLSCHAFT

地址：Haselstrasse CH-01 Baden CH

国籍：CH

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