Frequency Validation
Metrological verification procedures determine the frequency response and linearity of a motion sensor by subjecting it to controlled time-varying forces. Dynamic accelerometer calibration establishes the sensitivity of a transducer across a range of vibrations rather than at a single static point. This process ensures that the device provides accurate data during rapid movements or impacts.
The procedure requires a stable environment free from background noise. It is the primary method for certifying sensors used in automotive crash testing and industrial health monitoring.
Shaker Excitation
An electrodynamic shaker provides the mechanical input necessary to test the sensor. During dynamic accelerometer calibration, the shaker moves the device at specific amplitudes and frequencies. This movement is controlled by a digital signal processor to maintain a perfect sine wave.
Reference Standard
Comparison against a known value is the basis of every metrological claim. A reference sensor with a traceable history is mounted back to back with the unit under test. The dynamic accelerometer calibration software compares the two outputs to calculate the sensitivity deviation.
Transfer Function
Results of the test are plotted as a ratio of output voltage to input acceleration. This curve defines the flat operating range of the sensor. The dynamic accelerometer calibration certificate lists the resonance peak where the measurement error exceeds the allowed tolerance.
