Piezo vs. strain gauge

What is the difference between piezoelectric sensors and strain gauges?

Both technologies are based on the ability of certain materials to change their electrical properties when mechanical force is applied. In piezoelectric sensors, electrical charges are generated as a result of elastic deformation, these same electrical charges in strain gauges produce a change in electrical resistance. The two measurement technologies complement each other; depending on the application, either a strain gauge or a piezosensor is use. In principle, however, approximately 80 percent of all measuring requirements can be fulfilled equally by either piezoelectric sensors or strain gauges.

Advantages of DMS

  • Broad application range
  • Comparatively easy to use
  • Achieves extremely high precision (measurement error of less than 0.1 percent)
  • Uncomplicated cable insulation and no problems of cable movement
  • Drift-free measurement, even over extremely long periods of time
  • Compensation of temperature fluctuations via Wheatstone bridge

 

Advantages of piezoelectric sensors

  • Particularly well suited for quasi-static and dynamic processes
  • Acquisition of highly dynamic load changes up to one millisecond
  • Extremely broad measurement range of up to six decades
  • Analytical parameters such as sensitivity, response threshold and resolution are independent of sensor size
  • Extremely compact design
  • Rugged when exposed to high and low temperatures and overload
  • Largely fatigue-resistant, long service life, excellent long-term stability

Learn more about the piezoelectric effect.

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