Capacitive measuring system for measuring, in high temperature environment, play between moving parts, such as turbine blades, uses transformer with two secondary windings formed from high frequency transmission line

摘要

System having sensor (1a) across casing (CT) with electrodes (11a,12a), a high frequency transmission line (2a, 2b,2c) including conductors connected respectively to the electrodes includes transformer (3a,3b,3c) with extra secondary (3A) having first end bonded to the second ends (221a -221c) of first transmission line forming transformer secondary and first input terminal (-) of load amplifier (5) through capacitor and resistor (CA,CR). The second end is connected to a reference potential terminal (M).