ETS-Lindgren announced the opening of its new Acoustic Research Laboratory featuring state-of-the-art chambers for acoustic test services. With its hemi-anechoic chamber, two reverberation chambers, impedance tubes and supporting acoustic test equipment and software, the laboratory now offers product noise emission testing and structural/architectural acoustic testing. Acoustic field testing services are also available upon request. The laboratory is ISO 17025 accredited under the US Department of Commerce NIST National Voluntary Laboratory Accreditation Program (NVLAP).
Product noise emission testing is commonly performed in the double-walled hemi-anechoic chamber that is designed to measure very low noise emissions from products and devices at 80 Hz and above. Outside chamber dimensions are 8.5 m long x 8.5 m wide x 7 m high. This chamber is ideal for testing sound power and pressure levels as well as small fan noise. Products tested include Information Technology Equipment (ITE) such as laptop computers and associated printers, home appliances, garden equipment - essentially any noise emitting device may be tested in this chamber. Commonly referenced standards for testing in this chamber include ISO 3744, ISO 3745, ISO 7779, ISO 11201, and ECMA 74.
Structural/architectural acoustic testing is performed in the reverberation chambers. With transmission loss testing of wall samples, windows, doors, automobile panels and the like, customers can determine how much sound energy is transmitted through a product sample at specific frequencies. Sound absorption testing may also be performed in these chambers to determine how much sound energy is absorbed by products. Sound insulation products, fabrics, and wall absorbers for theatres are a few such products tested. The source chamber measures 7.4 m long x 5.9 m wide x 4.8 m high; the receive chamber measures 7.4 m long x 9.2 m wide x 6 m high. ASTM E90, ASTM C423, ASTM E596, and ISO 3741 are the most commonly referenced standards for testing in these chambers.
“We’re very excited about the acoustic testing services we can now offer our customers,” said Douglas Winker, Ph.D., Acoustic Engineer for ETS-Lindgren. “We designed these chambers for the best performance possible and worked closely with our facility personnel to ensure the parent building that houses these chambers enhances their performance. For example, the hemi-anechoic inner chamber sits on a 50 ton isolated concrete slab. The reverberation chambers sit on individual floating concrete slabs.” Dr. Winker added, “With our NVLAP accreditation, customers can be confident that we have a total quality system in place with instrumentation traceable to NIST and experienced technicians who produce accurate measurement data.” For more information on acoustic testing services, visit www.ets-lindgren.com/labservices.
For more information on acoustic research laboratories, visit Faraday .