IMPROVEMENT OF VERY LOW-FREQUENCY PRIMARY VIBRATION CALIBRATION SYSTEM AT NMIJ/AIST

W. Kokuyama, T. Ishigami, H. Nozato, A. Ota

Abstract

The very low-frequency primary vibration calibration system at NMIJ/AIST was improved with a new signal processing framework. It contains commercial hard disk drive so that photoelectric signals from homodyne interferometer can be recorded. Sine-approximation method with a digital band-pass filter is applied to boost signal-to-noise ratio. By calibrating a reference accelerometer, compatibility with the existing primary vibration calibration system was confirmed.

Keywords

very low frequency, primary vibration calibration, band-pass filter, sine approximation method

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IMEKO-WC-2015-TC22-431.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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