Keywords
Citation
(2005), "Ultra-small microphone scales new heights of surface dynamic pressure measurement performance", Sensor Review, Vol. 25 No. 2. https://doi.org/10.1108/sr.2005.08725bad.004
Publisher
:Emerald Group Publishing Limited
Copyright © 2005, Emerald Group Publishing Limited
Ultra-small microphone scales new heights of surface dynamic pressure measurement performance
Ultra-small microphone scales new heights of surface dynamic pressure measurement performance
Keywords: Pressure measurement
A new, 2.5mm low profile, aerodynamically shaped microphone has been introduced by Brüel & Kjær to simplify the measurement of true surface dynamic pressure (sound pressure) in a number of engineering applications (see Plate 4).
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- 20kHz) and dynamic range (30-140dB) of the new pre-polarised device are equivalent to those of traditional, much bulkier flush- mounted microphones.
Plate 4
A new 2.5mm low profile, aerodynamically shaped microphone has been
introduced by Brüel & Kjær
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 an 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 14- inch flush-mounted microphone. The microphone supports TEDS (Transducer Electronic Data Sheet) and, combined with proven system solutions such as PULSEe multi- analysers, brings new dimensions and ease of use to the test engineer,” commented Brüel & Kjær technical sales engineer, Jeremy Bryceson.
For further information contact: Nicola Parker, Brüel & Kjær UK Limited, Bedford House, Rutherford Close, Stevenage, Herts SG1 2ND. Tel: 01438 739000; Fax: 01438 739099; E-mail: ukinfo@bksv.com; web site: www.bksv.co.uk