Abstract
This manuscript describes how NMIJ isolates interferometer optics from the ground vibration for low-acceleration measurement by installing an anti-vibration table. Such a vibration isolation system is designed for an accelerometer calibration system to reduce vibration noise from the microtremor or from reaction of the vibration exciter. Mitigating the vibration of optics enables evaluation of accelerometers at small amplitudes, which is required in aerospace or infrastructure monitoring applications. In this manuscript, vibration transmissibility of the anti-vibration table is measured using a triaxial seismometer, and its benefit in the calibration system is discussed.
Highlights
Low-acceleration measurements are gradually required from the viewpoint of various industrial fields such as aerospace or infrastructure monitoring
Continuous measurement of eigenfrequency of structure using microtremor, which is in the order of 10−3 m/s2 or less, is proposed [4, 5]
A calibration system using a laser interferometer and a vibration exciter is used to determine the response of an accelerometer [6]
Summary
Low-acceleration measurements are gradually required from the viewpoint of various industrial fields such as aerospace or infrastructure monitoring. Continuous measurement of eigenfrequency of structure using microtremor, which is in the order of 10−3 m/s2 or less, is proposed [4, 5]. The demand for such measurements is gradually increasing with the aging of much of the infrastructure. The calibration result can suffer from the background noise of the interferometer, which originates from seismic vibration, self-noise of the interferometer, and so on. Mitigation of such noise is necessary to meet the demands of lowacceleration measurements.
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