NIOSH Mining Laboratory

Interior of anechoic chamber

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The Anechoic Chamber provides a reflection free (free-field) environment for acoustic testing. It is 1.3m wide by 2.6m long by 2.3m high interior wedge tip to wedge tip. The wedges are .71m long which yields a low frequency cut-off of 120 Hz. The chamber was recently used in an experiment to determine the effects of sound source position on measured noise exposure. For the experiment, it was necessary to insure that measurements were made in an environment that was free of acoustic reflections down to 150 Hz. The anechoic chamber provided the ideal location for these tests. The chamber can also be used for measuring the sound power of small devices.

Site:  Pittsburgh Research Laboratory