ETS-Lindgren's Hemi-Anechoic Chambers provide a precise free-field environment used to measure sound sources over a reflecting plane. Typical measurements include product noise testing, sound power, sound source frequency response, and sound source directivity. These chambers provide engineered features that achieve outstanding performance results and goals without compromising acoustical concepts and budgets.
Hemi-anechoic chambers are used to perform precision- and engineering-grade testing on a wide variety of devices ranging from handheld units to large vehicles and equipment.
ETS-Lindgren's hemi-anechoic chambers have a high-performance wall panel system that provides the low-noise environment required to test today's low-noise products. A precision-grade free-field environment is a product of the hemi-anechoic chamber's sound absorption system that consists of melamine wedges installed on a patented clip system that provides fast wedge installation and removal. Unlike other wedge solutions, melamine wedges provide a bright and fiber-free working environment.
Frequency Range
ETS-Lindgren offers a wide range of standard hemi-anechoic chambers to meet client needs. Standard chamber models have low-frequency cut off points of 80 Hz, 100 Hz, and 160 Hz. Custom chamber designs to meet other performance specifications are available.
Free-Field Region
ETS-Lindgren Hemi-Anechoic Chambers have free-field regions with a 1 m to 2 m radius as standard. Custom size free-field regions are available.
Precision-Grade Testing
ETS-Lindgren's standard hemi-anechoic chambers are designed to comply with ISO 3745 and ISO 26101 free-field limits for both broadband and pure tone testing.
Engineering-Grade Testing
The high-quality test environment in an ETS-Lindgren Hemi-Anechoic chamber provides low environmental correction factors (K2) values for ISO 3744 sound power testing.