1/2" prepolarized condenser random incidence microphone
50 mV/Pa | Model 377B20
Larson Davis
applications where high sensitivity is required
for signals arriving simultaneously
from multiple directions
A random incidence (RI) microphone is designed to have an accurate (flat) response in
applications where numerous signals approach the microphone from an assortment of
directions, at the same time. This RI microphone is sometimes referred to as a diffuse
field microphone.
When a freely propagating sound wave encounters an object in its path, the wave will
either, be reflected, absorbed or transmitted depending on the material properties and
size of the object as well as the actual wavelength of the sound. In practice, the very
microphones used to quantify the sound field introduce disturbances to the field which
must be compensated for if an accurate measurement is desired. The 377B20 compensates
for its own presence in the sound field and measures the true sound as if the
microphone did not exist
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