Application of PVDF Film Transducer in the High-speed Roundness Measurement System

For the demands of high speed and efficiency of on-line measurement of roundness in machining industry,a kind of high-speed roundness measurement system based on the piezoelectric displacement transducer that used PVDF film was developed.It can be used to achieve the goal of high-speed roundness measurement by combining with charge amplifier and taking advantages of transducer such as the high frequency,sensitivity and signal-to-noise ratio.The experimental results show that the measuring frequency response of the PVDF transducer is over 1 200 Hz which solved the problem of distortion measurement that caused by inductive transducer in high-speed measurement.The measuring results show that the roundness error of this system is less than 1 μm.Repeated measurements show that the measurement results of the system has high reproducibility and reliability.