PCB Piezotronics launches new ICP® array microphone and preamplifier
offering water and dust resistance
PCB Piezotronics,
a world leader in vibration, acoustic, pressure, force and torque
sensors has launched a new prepolarised array microphone for
harsh environments and applications such as automotive brake
and tyre noise testing. The model 130A24 is a ½in (12mm)
free-field polarised array microphone and preamplifier system
with replaceable water and dust resistant cover.
The 130A24's acoustically transparent cover provides an unobtrusive
alternative to windscreens and a more consistent response compared
to rubber protective covers that are normally used in the harsh
environments for which this microphone is ideal. The 130A24 features
a wide dynamic range from 30dBA (inherent cartridge thermal noise
level) to 143dB (150dB maximum before clipping) and is equipped
with a rugged stainless steel grid cap similar to PCB's high-end
condenser microphones.
Specifications include frequency range from 20Hz to 16kHz (±3dB),
sensitivity of 10mV/Pa and operating temperature range from -10
to +50°C. Model 130A24 is an ICP® sensor requiring 2-20mA
constant current supply and uses standard coaxial cables enabling
existing ICP® power supplies and cables to be used. This
interchangeability can result in significant per-channel cost
savings as well as reducing test set up times.
Acoustic pressure waves can be altered by objects in the sound
field including the microphone used to measure it. To correct
for this, free-field microphones such as model 130A24, are designed
to compensate for their own presence and provide more accurate
measurements. Although the 130A24 is optimised for flat response
in a free-field, it also provides excellent response in many
pressure and diffuse field microphone applications. As well as
automotive brake and tyre noise testing, the 130A24 is also suitable
for acoustic holography, beamforming, noise source identification,
general audible range testing, non-contact defect detection and
acoustic tests where oil splash, high humidity or dust is a concern.
The new model 130A24 water and dust resistant ½in array
microphone and preamplifier is available from stock for immediate
delivery.
October 2015
