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Methods for the calibration of vibration and shock transducers — Part 11: Primary vibration calibration by laser interferometry
rectilinear accelerometers (with or without amplifier) to obtain magnitude and phase lag of the complex sensitivity
by steady-state sinusoidal vibration and laser interferometry.
It is applicable to a frequency range from 1 Hz to 10 kHz and a dynamic range (amplitude) from 0,1 m/s2 to
1 000 m/s2 (frequency-dependent).
These ranges are covered with the uncertainty of measurement specified in clause 2. Calibration frequencies lower
than 1 Hz (e.g. 0,4 Hz, which is a reference frequency used in other International StandardDetails) and acceleration
amplitudes smaller than 0,1 m/s2 (e.g. 0,004 m/s2 at 1 Hz) can be achieved using Method 3 specified in this part of
ISO 16063, in conjunction with an appropriate low-frequency vibration generator.
Method 1 (fringe-counting method) is applicable to sensitivity magnitude calibration in the frequency range 1 Hz to
800 Hz and, under special conditions, at higher frequencies (cf. clause 7). Method 2 (minimum-point method) can
be used for sensitivity magnitude calibration in the frequency range 800 Hz to 10 kHz (cf. clause 8). Method 3
(sine-approximation method) can be used for magnitude of sensitivity and phase calibration in the frequency range
1 Hz to 10 kHz (cf. clause 9).
Methods 1 and 3 provide for calibrations at fixed acceleration amplitudes at various frequencies. Method 2 requires
calibrations at fixed displacement amplitudes (acceleration amplitude varies with frequency).
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