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Carl von Ossietzky University
Department of Medical Physics and Acoustics
Acoustics Group
26111 Oldenburg

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Carl von Ossietzky University
Department of Medical Physics and Acoustics
Acoustics Group
Carl-von-Ossietzky-Str. 9-11
26129 Oldenburg

Facilities

Anechoic Room

This room has usable interior volume of 8.50 x 7.00 x 4.00 m3 and fulfills the requirements for free-field measurements down to 50Hz.
The whole room is mounted on springs and placed inside a separate building, offering vibration insulation for frequencies above 5 Hz.

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Viblab

Human perception of whole body vibrations is investigated in this laboratory.
Both basic measurements like perception thresholds and just noticeable differences and the impact on the comfort are evaluated.
The depicted car environment simulator is used to reproduce the noise and vibration occurring in vehicles which are rated by subjects.

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Listening Booths

The acoustics group operates three soundproof cabines which are routinely used for headphone-based listening tests and the editing of sound signals.

Multi-channel data aquisition

Besides multiple state-of-the-art audio interfaces also mobile multichannel measurement systems for sound and vibration data are available, which comply with certifications for use in aircraft.

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Pressure chamber for infrasound

The investigation of human sound perception (e.g. the determination of equal level loudness contours) at low frequencies requires high sound pressure level that cannot be obtained in a large anechoic chamber with reasonable sized loudspeakers. Therefore, a small reverberant room excited by two 15" loudspeakers is used for this purpose.

 

Impedance measurements

A B&K 4206 impedance tube together with the PULSE front-end and software is available to measure the surface impedance, reflection and absorption coefficient from 50 - 6400 Hz in accordance with ISO 10534-2. An 4-microphone extension is available to furthermore determine the transmission loss and characteristic impedance/ propagation constant of acoustical materials with the two load method.

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Dynamic mechanical analyser

The dynamic mechanical analyser GABO Qualimeter Eplexor 500N is a system for the measurement of the complex Young's and shear modulus.
A forced non-resonance method (ISO 6721 Part 4 and 6) is used to determine the complex moduli in the range from 0 to 100 Hz. A liquid nitrogen cooling and a heating system offer a temperature range of -150 to 500°C.

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Wind Tunnel

The wind tunnel of Oldenburg University is a so called "acoustic wind tunnel" after the Göttingen principle.
This principle gives a flow with an extraordinary low amount of remaining turbulence, and thus an extraordinary low sound level of the flow.
The working section has the dimensions 0.8 x 1.0 x 1.8 m3. The maximum windspeed is approx. 50 m/s.


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