Phase response of intensity microphones: Generally speaking, one can say that the intensity technique measures the direction of the sound wave by detecting differences in arrival time at two microphone positions.
 

If the sound wave arrives at microphone A first and then, slightly later, at microphone B, the sound wave must be travelling in the direction from A to B. If, on the other hand, the sound arrives at microphone B first, then it must be travelling in the opposite direction. If the sound wave arrives at the two microphones at the same time, the sound wave must be travelling perpendicular to the microphone pair.
 

The ability of the microphones to determine accurately small timing differences can be expressed as the phase difference between the two microphones. Therefore, phase-matching is an all-important parameter for intensity microphones.
 

Click on images for details:

Intensity-microphone Calibrator
Type 51AB phase response calibration of microphone pairs used for measuring sound intensity
1/4" Intensity-microphone Pair
Type 40BI two phase-matched 1/4" intensity microphones, solid spacers and adapters for 1/4" Preamplifiers Type 26AA
1/2" Intensity-microphone Pair
Type 40AI and Type 40AK 40AK: set of two phase-matched 1/2" intensity microphones, solid spacers and adapters for a pair of 1/4" Preamplifiers Type 26AA 40AI: pair of phase-matched 1/2" intensity microphones similar to the Type 40AK but without spacers and adapters for 1/4" preamplifiers
1/2" Pre-polarised Intensity-microphone Pair
Type 40GI and Type 40GK 40GK: set of two phase-matched 1/2" prepolarised intensity microphones, solid spacers and adapters for a pair of 1/4" Preamplifiers Type 26AA 40GI: pair of phase-matched 1/2" prepolarised intensity microphones similar to the Type 40GK but without spacers and adapters for 1/4" preamplifiers

 
Want to learn more or place an order?     Contact us.
 

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

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