| Abstrakt: |
A longitudinal study of impulse-type noise is being conducted by the Department of Neurophysiology and Acoustics, U. S. Naval School of Aviation Medicine, Pensacola, Florida. As a part of the study, efforts were directed toward improvements in the techniques and instrumentation usually used to quantify the rise times, peak pressure levels, and decay patterns of impulse noises. This paper reports an improved instrumentation for impulse noise analysis. The limitations imposed by condenser microphones, magnetic recorders, and level recorders in response to transients associated with blast phenomena were investigated. In view of these serious limitations, the use of alternative techniques and systems was explored. The use of high-intensity crystal microphones and a storage-type scope was found to provide sufficient accuracy and flexibility for the variety of explosive transients encountered in field studies of many weapons. Pictorial evidence will be presented to illustrate the extent to which the limitations of earlier systems were overcome. [ABSTRACT FROM AUTHOR] |
