Electrodynamic Vibration Standard with a Ceramic Moving Element

Abstract

This paper describes a new rectilinear vibration exciter specifically developed for accurate calibration of piezoelectric accelerometers. It is an electrodynamic shaker, using a permanet magnet with a ceramic moving element guided by an air-bearing system. The moving element has a simple circular cross section and the driving coil is wound directly onto it. Its first axial resonance is near 25 000 Hz. The working range of the shaker extends from 5000 to less than 5 Hz. The moving element includes a means of mounting an internal accelerometer that can be used as a secondary standard. Alternatively, the moving element/accelerometer assembly can be calibrated by a reciprocity method and used as an absolute standard. The results of measurements of transverse motion and harmonic distortion are presented, as well as an exmple of pickup calibration.

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