The accuracy of absolute calibration of vibration pickups and a new calibration method using separate mountings.

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Abstract

The accuracy of the absolute calibration of vibration pickups is discussed. The effect of mounting of the laser interferometer and the vibrator is studied for the two conventional calibration methods, i.e. the fringe counting and disappearance methods. The result shows that it is preferable to mount an interferometer and a vibrator on separate heavy blocks independently for highly accurate calibration. The separate mountings make it possible to calibrate vibration pickups within 0.2% total error. A new calibration method using separate mountings is proposed, and effectiveness of this method is examined by comparing with these two conventional methods. This new method covers a wide frequency range including the frequency ranges of the conventional methods. In addition, phase lag from a vibrating surface to a pickup is measured by this method.

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