Measuring device for local electrical conductivity of plasma

摘要

The measuring device for local electrical conductivity contains a probe (1) which is connected in force-locked manner to a drive device (2) and a series circuit consisting of an inductive transmitter (3), a measurement generator (4) and a detector (5), the output of which is connected via an optoelectronic transducer (13) to a differential stage (9) with a change-over switch (10) and to a storage element (11). The output of the differential stage (9) is connected to one input of a recording measuring instrument (12), the other input of which is connected to a command transmitter (8) which is electrically coupled to an electropneumatic unit (6) in which pressure valves of the advancing device (2 and 15) for the probe and, respectively, a calibration crystal are accommodated which are connected via hoses (6') to compressed-air cylinders (21 and 28) of these devices (2 and 15). <IMAGE>