Bruel & Kjaer UK Ltd. - PRODUCT NEWS

ULTRA-SMALL MICROPHONE SCALES NEW HEIGHTS OF SURFACE DYNAMIC PRESSURE MEASUREMENT PERFORMANCE A new, 2.5mm low profile, aerodynamically shaped microphone has been introduced by Bruel & Kjaer to simplify the measurement of true surface dynamic pressure (sound pressure) in a number of engineering applications. Even though the innovative Surface Microphone Type 4949 is only 20mm in diameter with a height of 2.5mm including its integrated preamplifier, the acoustical performance (5Hz to 20kHz) and dynamic range (30 to 140dB) of the new pre-polarised device are equivalent to those of traditional, much bulkier flush-mounted microphones. The new all-titanium microphone can be easily integrated into a flexible mounting pad that eliminates the need to drill holes in the test object and minimises the costs of mounting the microphone. Robust and corrosion-resistant, the simple-to-use, accurate surface microphone can withstand harsh environments including wet and oily conditions. The Type 4949’s ultra-low 2.5mm profile and novel, flexible, disc-formed mounting pad make it ideal for measurement of dynamic pressure (sound pressure) directly on the surface of a aircraft, vehicle or wind power blade or for sound pressure measurements in limited spaces and where flush mounting of conventional microphone/preamplifier combinations would be impossible or may cause undesired side effects. The microphone is also suitable for a wide range of test and measurement applications including: acoustical fatigue testing; aerodynamic noise measurements; noise reduction measurements; transfer path analysis as well as lift and down-force analysis. “Despite its total height of only 2.5mm, the new Surface Microphone Type 4949 has an integrated pre-amplifier and an acoustical performance and dynamic range equivalent to that of a traditional ¼-inch flush-mounted microphone. The microphone supports TEDS (Transducer Electronic Data Sheet) and, combined with proven system solutions such as PULSE ™ multi-analysers, brings new dimensions and ease of use to the test engineer,” commented Bruel&Kjaer technical sales engineer, Jeremy Bryceson. __________________________________________________ For more information, please contact :- Bruel & Kjaer UK Ltd. Bedford House, Rutherford, Close, Stevenage, Herts. SG1 2ND. UK Tel: +44(0) 1438 739000, Fax: +44(0) 1438 739099 E-mail: Website: November 2004
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