From one dedicated family to another: The GRAS story continues

In 2024, it is 30 years since visionary acoustics pioneer, Gunnar Rasmussen, founded Gunnar Rasmussen Acoustic Services – today known as GRAS Sound & Vibration. What has followed since then is a fairy tale story of growth and acoustic achievements, all built on Gunnar Rasmussen’s guiding vision of innovation and customization. Today, GRAS is part of the Axiometrix family of measurement solution providers. But Gunnar’s vision and values still guide the company.

Pass-fail windows

On a production line, the devices under test (DUTs) have a set of specifications from R&D or the customer that they must comply with. This can be viewed as a window on a graph.

A day without EQset versus one with EQset™

There are many factors involved with running a production line that can affect its efficiency. Some of them are controllable and others are just facts of life.  Calibration (particularly calibration frequency) is one area that can be adjusted and have a considerable impact on the performance of the line. Of course, there is a trade-off. The trade-off for traditional microphones on a production line is increased uncertainty. Reduced calibration is more uptime on the line, but it results in an increase of good units being tagged bad and bad units making their way into the market, damaging customer satisfaction and adding the expense of returned products. Another option is a microphone that is stable and accurate without frequent calibration.

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.