Dynamic measurement

Dynamic measurements are ubiquitous in virtually all modern technological applications. The majority of calibration services of today are nevertheless based on test signals that are either constant in time, or relatively simple (sinusoidal, step etc.).

At present there are no widely accepted methods how to transfer the results of a dynamic calibration to the usually much more complex signals found in many applications. The traceability of dynamic calibrations is thus often strictly limited to the calibration laboratory as very little guidance is provided how the calibration result should be transferred to the measurements it is supposed to serve.

In this perspective, SP is developing a framework called ’Dynamic Metrology’ dedicated to extend the concept of dynamic calibration and bridge the gap between the calibration and its practical use.

The scope includes but is not limited to:
  • Methods to transfer the results of dynamic calibrations to measurements of interest
  • Dynamic calibration methods for various quantities and measurement systems
  • System analysis of complex measurements
  • Optimization of measurement systems
  • Dynamic correction of time-dependent measurements
  • Evaluation of time-dependent dynamic measurement uncertainty
Typical examples of applications of Dynamic metrology
  • For measurements of force during a crash test, the force sensor has been calibrated with 0.5% uncertainty for constant force and 2% for sinousoidal force up to a frequency of 1 kHz. What is the expected accuracy for a crash of duration 10 ms?
  • Two sensors of claimed uncertainty less than 1% measures the same pressure pulse with 12% difference in peak amplitude, how is that possible?
  • What is the best electrical filter to improve the performance of my strongly resonant force sensor?
  • The dynamic performance of my measurement system is not satisfactory, how can it be improved without hardware modifications?
  • What is the dynamic measurement uncertainty of my voltage divider?
  • In the production of relays, a pass/fail criteria with a fast voltage control signal is used with an action measured with a force sensor. For correct pass and fail detection, the accuracy and response time for detection is of primary interest in order to reject faulty relays with maximum efficiency. How can the response time be reduced for faster detection? Now it limits the productivity.
  • What is the best height profile of road humps for most effective speed limitation and with minimum risk of injury for bus drivers?

Research is underway to bring out the best speed limiting road hump

Many drivers have a problem of too violent reaction of their vehicle when passing poorly constructed road humps, even at allowed speed.Read more...

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