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G.R.A.S. Sound & Vibration - Intensity Probes

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The intensity-measurement technique is a powerful tool for locating sound sources, order rank them and determine the emitted sound power. The method is based on the simultaneous determination of sound pressure and particle velocity by two (or more) closely spaced microphones. The sound intensity probe must ensure a well-defined acoustic spacing between the microphones as well as minimise disturbances to the sound field.
 
To ensure maximum measurement accuracy, the spacing between the micro-phones must be optimised for the given measurement conditions. At low frequencies, in highly reverberant conditions, this spacing must be large, whereas for measurements at high frequencies, it must be small.
 

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Intensity Probe

 

Type 50AI-xx
Includes: pair of 1/2" intensity microphone Type 40AI, spacers, adapters, pair of 1/4" preamplifiers Type 26AA and remote control handle.
Versions for connection to a wide range of intensity analysers available.

 
 

CCP Intensity Probe

 

Type 50GI : CCP intensity probe
For direct connection to signal analyzers or data acquisition devices with IEPE inputs. Probe includes a pair of phase-matched pre-polarised precision micr., meets IEC standard 61043 for a class-1 intensity probe.
The small rugged 1/4" CCP preamplifiers ensure minimum disturbances
to the sound field for accurate measurements in the full frequency range

 
 

Special Intensity Probes

 

Type 50VI : vector intensity probe
Flexible + Adjustable, two or three-dimensional sound-intensity probe.
Probe handle has marked inputs for 3 pairs of preamplifiers (a pair for each of the mutually-perpendicular directions), a 24-pin LEMO output socket for connecting it to a suitable Power Module (e.g. Type 12AC)

Type 50VI-3 : wide-band intensity probe
Flexible + Adjustable, 4 channel sound-intensity probe.
Enables sound intensity measurements using two different microphone spacers simultaneously to cover an extended frequency range.
 

 

Type 50VX : X-Y-Z intensity probe
Two-channel intensity probe for serially measuring a 3D
sound intensity vector in a stationary sound field

 

 
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