PSD (position sensitive detector) had the advantages of low cost,fast response and high sensitivity.By combing one-dimensional PSD with electrostatic levitation,an advanced levitated droplet oscillation method was proposed to measure the surface tension and viscosity of high-temperature molten materials with high precision.After the levitating sample was heated by semiconductor lasers and melt,the output position controlling signal was added by a period of sinusoidal oscillatory signal which frequency and amplitude were adjusted.The decay signal after stable oscillation was captured by one-dimensional PSD and analyzed by spectrum transform to get the resonant frequency and fitted by exponential function to get decay time.A pure Zr sample was experimented to measure molten droplet oscillation.By calculating the surface tension and viscosity of molten Zr droplet,the measuring method is verified.
