Measuring the noise levels and spectra in the vicinity of large rocket engines and space vehicle boosters, and at distances up to about one mile during static testing, is one of the many responsibilities of the Acoustics Section of the Test Laboratory at Marshall Space Flight Center. To obtain data under a variety of climatic and field conditions with the necessary accuracy, reliability, and in a form readily accepted by existing data recording facilities, a new instrumentation system was designed, tested, and built.
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