Electroacoustic Engineer, Brian Johansen, has tested sound in everything from airplanes and cars to refrigerators and satellite launches.

It took over 40 years for someone to come up with a better ear simulator than the 711 coupler originally developed by acoustic engineering pioneers Per Brüel and Gunnar Rasmussen. That someone was Brian Johansen.

How do I correct a measurement with them?

Understanding laminar flow, turbulent flow and the transition region

Flow can be divided in two main types: 1) laminar and 2) turbulent.

Laminar flow is characterized by fluid particles following smooth paths