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

• 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
• Download:

  IMEKO-WC-2015-TC22-431.pdf
• DOI:

  _unreg_wc-2015.431

Event details: