Page 51 - Jul2009

Instrumentation
Dick Stern
Applied Research Laboratory, The Pennsylvania State University PO Box 30, State College, Pennsylvania 16804
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Recently, an array of PCB® Piezotronics Model T130D21 microphones was used to evaluate the noise sources of a house- hold appliance at different frequencies. An articulating confor- mal array and software system not only reduced the setup time for near-field measurements but ultimately identified the true
noise sources on the product, both structural and airborne. PCB® Model T130D21 array microphones, with their excellent phase characteristics, are small, cost effective and are ideal for performing the same type of testing on a variety of products. Contact: Jennifer Beal (prospects@pcb.com).
PCB Piezotronics, Inc., introduces a new series of MEMS shock accelerometers. PCB® Series 3991/3501 MEMS shock accelerometers represent state-of-the-art industry technology for miniature, high-amplitude, DC response acceleration sen- sors, capable of measuring long duration transient motion, as well as responding to and surviving extremely fast rise times typical of high-g shock events. The air-damped acceleration
sensing element, that is micro-machined from silicon meas- ures just 2.5 x 1.7 x 0.9 mm. The sensor incorporates a seismic mass, protective over range stops, and a full-active, piezore- sistive Wheatstone bridge. The slight air-damping reduces the resonant amplification and increases measurement accuracy. The over range stops give the sensor exceptional survivability. Contact Jennifer Beal (prospects@pcb.com).
Editor’s Note—The items printed in “Instrumentation” are reported for informational purposes only and are not necessar- ily endorsements by the Editor, Acoustics Today, or the Acoustical Society of America.
50 Acoustics Today, July 2009