Correction and evaluation of the effect due to parasitic motion on primary accelerometer calibration

Absolute calibration device of the vibration sensor

“…It consists of a vibration table and power amplifier frequency (0.01–160 Hz) and an intermediate frequency (5 Hz to 10 kHz) vibration system; this system consists of low‐frequency and intermediate frequency, vibration of a power amplifier to design the vibration table, in the domestic existing vibration table developed technology of independent innovation based on the following aspects: (i) For the low‐frequency vibration level, fast algorithm adjustment is adopted so that the calibration time is shorter. (ii) The low‐frequency platform waveform adopts the technique of the motion feedback control [9], and the linearity of the supporting parts is improved, so that the low‐frequency waveform distortion is smaller, and the technical indexes can be achieved as follows: Acceleration distortion ⩽1%. Acceleration lateral vibration ratio ⩽1% (0.01–10 Hz), ⩽5% (10–160 Hz). The mesa is uneven ⩽1%. (iii) For the medium‐frequency vibration table, the moving parts are made of lightweight and high‐strength materials, and the vibration table has a higher working frequency (10 kHz) [10]. Technical indicators are as follows: Acceleration distortion ⩽1% (5–1000 Hz), ⩽3% (1000 Hz to 10 kHz). Acceleration lateral vibration ratio ⩽3% (5–1000 Hz), ⩽5% (1–5 kHz), ⩽10% (5–10 kHz). …”

Improvement on the Transducer Sensitivity Measurement Results using Vibration Exciters

“…2. Transverse acceleration in the direction θ will produce maximum output, and the inputs in the x-y plane at θ ± 90° would theoretically produce no output [5].…”

“…A perfect exciter should provide a stable, single direction and distortion-free vibratory movement at any desired frequency and amplitude, but unfortunately such condition cannot be easily achieved. It could reasonably be correct, that the transverse sensitivity of the accelerometer and the transverse motion generated from exciter influence the accuracy of the calibration of the accelerometer when using these exciters [5].…”

A novel approach for realization of primary vibration calibration standard by homodyne laser interferometer in frequency range of 0.1Hz to 20kHz

“…[15,16]. Oota et al [27] describes a simple approach of measuring the uncertainty contribution due to this effect by precisely controlling the thickness of spacer with hole, which is pinched between accelerometer and top surface of vibration exciter through which the orientation of transverse sensitivity can be turned. It can be observed that air bearing shaker has transverse motion much below the prescribed limits in ISO 16063-11 standard.…”