Study on capacitance method clearance measurement application system based on AD7746
Lihua Zhu · Transducer and Microsystem Technologies · 2008
In order to measure aero-engine parts'clearance precisely,an application research on capacitance method clearance measurement is carried out,and it mainly designs a capacitance method clearance measurement application system based on the programmable capacitance-digital converter AD7746.Driven cable is used to avoid parasitic capacitance's influence on measuring results and enhance its anti-jamming ability,wide measurement range and high precision can be achieved by configuring compensation registers of AD7746.This system is tested many times on the own-designed experiment platform,which shows that expected targets are achieved with nice linearity,good repeatability and high precision.Finally a scheme of engine's tip clearance measurement by capacitance method is given.