基于压电效应的激光测振仪校准理论方法研究

Laser vibration measurement technology has become an important means of dynamic measurement and calibration, in the field of dynamic measurement and calibration, that performance directly affects the measurement results. It is important that research on laser vibrometer calibration technology particularly. In this paper, a calibration method of laser vibrometer based on piezoelectric effect is proposed, and a testing system with piezoelectric beam as sensing element is designed. Through theoretical analysis, a dynamic finite element model of piezoelectric beam is established. It modulates the measurement signal frequency of the laser vibrometer through the piezoelectric cantilever beam and simulates the measurement vibration environment of the laser vibrometer to realize dynamic feature calibration of the laser vibrometer. The simulation results show that the output response of the piezoelectric beam is fast and the delay is small. Whether DC or AC excitation, the relative error between the excitation signal and the output displacement signal of the piezoelectric beam is less than 1%. It can calibrate the dynamic performance of the laser vibrator and improve the calibration efficiency and application range and provides a method for the further research of laser vibrometer calibration technology.