What is it about?
The Mil Standard 1474 places a high standard on instrumentation and microphones to achieve the accuracy required. This paper shows the pitfalls of applying incorrect instrumentation and encourages the correct setup and requirements for accurate impulse noise assessment. Condenser pressure microphones - when selected and understanding the correct test configuration - without their protection grid is show.
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Why is it important?
Gun shot and Suppressor measurements is a growing application and measurements and techniques vary wildly in practice. Following the Mil Standard get to most the way there. Once you use the correct instrumentation and microphones in a proper configuration - valid comparative measurements, the goal of any standard, can be made to provide the proper analytics to assess levels and human exposure to impulsive sounds
Perspectives
"Let's measure right" has been the foundation of Bruel & Kjaer philosophy. The information contained in this publication leads to making the right gunshot or suppressed gunshot measurements. Use wide band instrumentation, use 1/4 inch (6mm) pressure microphones to make acceptable measurements to 40kHz every time! and use 1/4 inch free-field microphones to extend the measurement to 100kHz.
Jim Weir
Bruel & Kjaer North America
Read the Original
This page is a summary of: Using and selecting small condenser format microphones for impulsive noise measurement, The Journal of the Acoustical Society of America, September 2018, Acoustical Society of America (ASA),
DOI: 10.1121/1.5067556.
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