The Study On Calibration System Of Microsecond Narrow Pulse Of Acceleration Sensor Research

In this study, we has discussed the current sensor amplitude-frequency characteristics calibration system around the world, about the problem of high g acceleration sensors for amplitude-frequency characteristics calibration, study on microsecond narrow pulse calibration system with the help of Hopkinson bar technique.Establish an experimental platform for high-g acceleration sensor can be calibrated amplitude-frequency characteristics Based on the theoretical analysis, computer simulation and experimental research method of combining, several aspects are mainly studied as followings:(1) About signal generation, we have designed six different sizes Hopkinson bar, with compressed air pushing the bullet hit Hopkinson bar the way to generate microsecond narrow pulses.By simulation and experimental validation of six bars can generate narrow pulses minimum pulse width values, which range from5μs～12μs.The six bars are to meet one-dimensional stress wave theory by analyzing bar stress wave theory.(2) About signal measurement, compared the relative error about strain gauge measurement and the method of laser interference measurement and based on the ANSYS simulation analysis to measure the effects of different calibration points.With sensors for measuring force base point, changing the optical path to achieve axial laser measurement of the real excitation signal through the mirror the axial laser measurement, designed slotted sensor mount beam can pass, Improved microsecond narrow pulse calibration system.(3) By the microsecond narrow pulse calibration system designed for B&K company developed high g value piezoelectric accelerometer8309(#12068) were dynamic calibration experiments.In signal processing, about excitation signal extracted from the Doppler signal, compared the wavelet transform time-frequency analysis and instantaneous phase solution algorithm, the final choice of the instantaneous phase solution algorithm. After debugging experiment many times, amplitude-frequency characteristic curve obtained its operating band is34kHz and frequency amplitude fluctuations within0.5dB.