In-Situ Calibration of Piezoelectric Accelerometer with Built-in Exciting Component

Abstract

Piezoelectric accelerometer is widely used for monitoring the health states of machineries and structures. The validity, reliability and tractability of their measuring results should be verified by periodic calibrations or checks. But in some important vibration monitoring situation, it is impossible to check the accelerometer by normal comparison calibration method. So, a kind of piezoelectric accelerometer with built-in exciting component bad been developed to realize in-situ check purpose. The built-in exiting component is excited by an electric signal to vibrate the seismic mas and sensing piezoelectric component to simulate the vibration measured. The relationship of output and input electric signal of the accelerometer can be used to evaluate its performance. But previously this method was not traced to the vibration meteorology method and standard, the validity and reliability of this kind of accelerometer and the in-situ check method were not proved and supported. In order to establish tractability chain for this kind of accelerometer, its sensitivity was calibrated by vibration measurement standard, its electric sensitivity was a calibrated voltage measuring instrumentation and its coefficient of built-in exciting component is calculated, the electric exciting calibration method is linked to the vibration measurement standard. The modeling analysis and experiments reveal the tractability of the electric exciting calibration method and feasibility of the in-situ calibration based on this method.