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Microphones and Acoustics

Frequently Asked Questions

Get your most commonly asked acoustics questions answered.

Section I: Definitions and Terminology
Section II: Microphone Recommendations
Section III: Calibration and Testing
Section IV: Specification Clarifications
Section V: Specialty Microphone Applications
Section VI: Maintenance and Handling

If you don’t see the answer to your question, call our 24/7 SensorLineSM 716-684-0001 to speak with an application engineer or visit Ask the Acoustics Experts.

What is NAH and its relationship to ’array’ microphones?

NAH is Near Field Acoustic Holography. A single microphone can measure amplitude and frequency. By using multiple quality microphones with good phase matching characteristics, tests can be performed to show direction, particle velocity and intensity. NAH software systems can utilize an array of microphones to enable engineers to reduce the time and cost to minimize noise and vibration, by performing sound pressure mapping and holography tests for noise sources and transmission paths on 2D (planar) surfaces. 

What is NAH and its relationship to ’array’ microphones?

NAH is Near Field Acoustic Holography. A single microphone can measure amplitude and frequency. By using multiple quality microphones with good phase matching characteristics, tests can be performed to show direction, particle velocity and intensity. NAH software systems can utilize an array of microphones to enable engineers to reduce the time and cost to minimize noise and vibration, by performing sound pressure mapping and holography tests for noise sources and transmission paths on 2D (planar) surfaces.