PRIMARY ACCELEROMETER CALIBRATION IN UME BY SINE APPROXIMATION METHOD

The traceability of the vibration measurements to SI units is maintained through the calibration of the reference transducers. Primary calibration of the reference transducers in the field of mechanical vibration and shock is performed in accordance with the international standard ISO 16063-11 [1]. In some applications beside magnitude of the transducer's sensitivity, the knowledge of phase shift is also required. Magnitude and phase shift of the complex sensitivity of the reference transducer could be obtained by applying the sine approximation method, described in ISO 16063-11 standard. In general, this method is applied in many leading National Metrology Institutes in the world. However, experimental implementation of the method varies from one institute to another. The experimental setup constructed in Turkish National Metrology Institute for the realization of sine approximation technique and calibration results for reference standard accelerometers are presented in this paper.