Electrical capacitance clearanceometer

摘要: A hot gas turbine engine capacitive probe clearanceometer is employed to measure the clearance gap or distance between blade tips on a rotor wheel and its confining casing under operating conditions. braze sealed tip of carries capacitor electrode which electrically connected an electrical inductor within inserted into position at inner surface casing. Electrical power supplied through voltage controlled variable frequency oscillator having tuned circuit in component. The signal modulated by change capacitance passing while automatic feedback correction corrects drift. therebetween modulates signal. then processed phase detector related circuitry provide proportional gap.