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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Other G.R.A.S. Sound and Vibration products

• Microphones
• Preamplifiers
• TEDS Microphones
• Power Modules
• Intensity microphones and calibrators
• Pistonphones and Calibration equipment
• Telephone test head
• KEMAR Manikins - Types 45BM and 45BA
• Artificial ears, ear & mouth simulators
• Accessories
• Handset Positioning System - Type 45EA