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Fredrik Arrhén

Senior scientist

Tel

+46 10 516 56 24

Email

fredrik.arrhen@ri.se

Location

Borås

Active in mass-related quantities, measurement quality and uncertainty as well as dynamic measurements of mechanical quantities.

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Ask me about

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Dynamic force calibration using impact hammer

The project will develop technical competence and ability to measure dynamic force.

New method for measuring dynamic pressure

RISE is working to develop measurements of dynamic processes. Dynamic calibration of pressure sensors is an area that is important for reducing measurement uncertainty in industry.

Extending dynamic traceability to high pressure

RISE has long been developing standards for measurements of dynamic processes. Dynamic calibration of pressure sensors is an area that is important for reducing measurement uncertainty, but traceability is lacking.

Calibrating torque transducers during rotation

The project will develop methods and systems for calibrating torque transducers during rotation.

Measurement of the latency of dynamic pressure sensors

The project was a part of the development of the shock tube which is our candidate primary standard for dynamic pressure calibration. Under the project we developed a robust method that provides traceable measurement of the latenc…

Dynamic measurements

The knowledge platform for Dynamic measurements is a long-term investment where RISE, together with academia and industry, builds and spreads competence within measurement, calibration and traceability of fast mechanical processes…

Secondary system dynamic pressure

The project aims to enable the characterization of dynamic pressure sensors in a continuous frequency range from static pressure to hundreds of kilohertz by bridging the frequency gap between static pressure standards and shock tu…

RMP-FoU Repeatable Shocks

To measure is to know. Dynamic pressures are measured in many processes including combustion of chemical and biological fuels. Yet, traceable metrology, and hence knowledge of the quality of measurement, is not established for dyn…

Fast and correct measurements are difficult

Measuring is about acquiring a basis for decisions. But how can we know that our measurements can be trusted? When it comes to rapid changes and dynamic events, it can be difficult.

The National Laboratory for Pressure and

RISE is Sweden's NMI (National Metrology Institute) and is, according to the Swedish constitution, responsible for the central measurement quantities in the International System of Units, SI.

Dynamic pressure testing

One of a few test beds globally that is primary used for research/testing and characterization of dynamic pressure measurement systems.

Density control / Leak detection

Looking for gas leaks can be frustrating! To find leaks quickly and to assess whether they are too large to pass, it helps to know some of the underlying theory and "tips and tricks".