BS ISO 16063-15:2006

Foreword
1 Scope
2 Normative references
3 Uncertainty of measurement
4 Requirements for apparatus
   4.1 General
   4.2 Frequency generator and indicator
   4.3 Power amplifier/angular vibration exciter
        combination
   4.4 Seismic block(s) for vibration exciter and
        laser interferometer
   4.5 Laser
   4.6 Interferometer
   4.7 Instrumentation for interferometer signal
        processing
   4.8 Voltage instrumentation, measuring true r.m.s.
        accelerometer output
   4.9 Distortion-measuring instrumentation
   4.10 Oscilloscope (optional)
   4.11 Other requirements
5 Ambient conditions
6 Preferred angular accelerations and frequencies
7 Common procedure for all six methods
8 Methods using fringe-counting (methods 1A and 1B)
   8.1 General
   8.2 Common test procedure for methods 1A and 1B
   8.3 Expression of results
9 Methods using minimum-point detection (methods 2A
   and 2B)
   9.1 General
   9.2 Common test procedure for methods 2A and 2B
   9.3 Expression of results
10 Methods using sine approximation (methods 3A and 3B)
   10.1 General
   10.2 Procedure applied to methods 3A and 3B
   10.3 Data acquisition
   10.4 Data processing
11 Reporting of calibration results
Annex A (normative) Uncertainty components in primary
        angular vibration calibration of vibration and
        shock transducers by laser interferometry
Annex B (normative) Equations for the calculation of
        the angular quantities of rotational angle,
        theta, angular velocity, ohm, and angular
        acceleration, alpha, and of the sensitivities of
        angular transducers: rotational angle transducers,
        S[theta], of angular velocity transducers, S[ohm],
        and angular accelerometers, S[alpha]
Bibliography

Describes the instrumentation and procedures used for primary angular vibration calibration of angular transducers, i.e. angular accelerometers, angular velocity transducers and rotational angle transducers (with or without amplifier) to obtain the magnitude and the phase shift of the complex sensitivity by steady-state sinusoidal vibration and laser interferometry.

This part of ISO16063 specifies the instrumentation and procedures used for primary angular vibration calibration of angular transducers, i.e. angular accelerometers, angular velocity transducers and rotational angle transducers (with or without amplifier) to obtain the magnitude and the phase shift of the complex sensitivity by steady-state sinusoidal vibration and laser interferometry. The methods specified in this part of ISO16063 are applicable to measuring instruments (rotational laser vibrometers in particular) and to angular transducers as defined in ISO2041 for the quantities of rotational angle, angular velocity and angular acceleration.

It is applicable to a frequency range from 1Hz to 1,6kHz and a dynamic range (amplitude) from 0,1rad/s² to 1000rad/s² (frequency-dependent).

These ranges are covered with the uncertainty of measurement specified in Clause3. Calibration frequencies lower than 1Hz (e.g. 0,4Hz, which is a reference frequency used in other International Standards) and angular acceleration amplitudes smaller than 0,1rad/s² can be achieved using method 3A or method 3B specified in this part of ISO16063, in conjunction with an appropriate low-frequency angular vibration generator.

Method 1A (cf. Clause8: fringe-counting, interferometer typeA) and method 1B (cf. Clause8: fringe-counting, interferometer typeB) are applicable to the calibration of the magnitude of complex sensitivity in the frequency range of 1Hz to 800Hz and under special conditions, at higher frequencies. Method 2A (cf. Clause9: minimum-point method, interferometer typeA) and method 2B (cf. Clause9: minimum-point method, interferometer typeB) can be used for sensitivity magnitude calibration in the frequency range of 800Hz to 1,6kHz. Method 3A (cf. Clause10: sine-approximation method, interferometer typeA) and method 3B (cf. Clause10: sine-approximation method, interferometer typeB) can be used for magnitude of sensitivity and phase calibration in the frequency range of 1Hz to 1,6kHz. Methods 1A, 1B and 3A, 3B provide for calibrations at fixed angular acceleration amplitudes at various frequencies. Methods 2A and 2B require calibrations at fixed rotational angle amplitudes (angular velocity amplitude and angular acceleration amplitude vary with frequency).

NOTE1 The numbering 1 to 3 of the methods characterizes the handling of the interferometer output signal(s) analogous to ISO16063-11: number 1 for fringe counting, number 2 for minimum-point detection and number 3 for sine-approximation. Each of these signal handling procedures can be used together with interferometer typesA and B specified in this part of ISO16063.

Interferometer typeA designates a Michelson or Mach-Zehnder interferometer with retro-reflector(s) located at a radius, R, from the axis of rotation of the angular exciter. This interferometer type is limited to rotational angle amplitudes of 3° maximum. Interferometer typeB designates a Michelson or a Mach-Zehnder interferometer using a circular diffraction grating implemented on the lateral surface of the circular measuring table. This interferometer type is not limited as regards the rotational angle amplitude if the diffraction grating covers the whole lateral surface of the disk (i.e. 360°). Usually, the maximum angular vibration is, in this case, limited by the angular vibration exciter.

NOTE2 Though the calibration methods specified in this part of ISO16063 are applicable to angular transducers (according to definition in ISO2041) and, in addition, to measuring instrumentation for angular motion quantities, the specifications are given for transducers as calibration objects, for the sake of simplified description. Some specific information for the calibration of rotational laser vibrometers is given in 4.11 and Figure11.