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**A force for progress

Working together for a changing world, a key priority for France's metrology network.

Organization, teams, projects and perspectives of the French metrology network.

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**Metrology Events

World Metrology Day

May 20 is World Metrology Day, commemorating the anniversary of the signing of the Metre Convention in 1875. This treaty provides the basis for a coherent measurement system worldwide.

The theme chosen for 2016 is Measurements in a Dynamic World.

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**Special feature : Dynamic calibration of pressure sensors

Dynamic calibration of pressure sensors

Pressure measurement in non-equilibrium conditions is required in many applications. For example, pressure must be monitored in the cylinders of an engine to study combustion phenomena, in an injection moulding press to study a moulding process, in a Pitot tube to determine the speed of an aircraft, or in a catheter to determine blood pressure. In applications like these the pressure quantity is in dynamic state, i.e. the measurand is constantly changing, including during measurement. In static state a sensor is characterized by its sensitivity for a given measurand, defined as the variation in output quantity divided by the corresponding variation in the measurand. The same calculation performed in dynamic state produces different sensitivity values. Determination of sensitivity as performed in static state is thus not sufficient for dynamic calibration, and a specific method is required. To design this calibration method, the characteristics of the sensor must first be defined. Specific references are then required to perform the calibration. Further studies and calibrations must also be carried out to take into account the specific characteristics of the measurement system (measurement line, recessed chamber, change of fluid, etc.).

Dynamic calibration of pressure sensors (pdf - 165 kB)