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Acoustic Instrumentation for Measurements in the Minuteman Missile Silo
An instrumentation system has been developed to measure, record, and analyze various properties of the dynamic pressure field in the Minuteman launching silo. This system permits the simultaneous recording of up to 13 channels of data from microphones placed in the silo environment. These data may then be processed to obtain frequency spectra, time correlation functions, and space correlation functions. The data acquisition system has a frequency response from 0 to 10,000 cps, a wide dynamic range, and (to permit correlation analyses) a maximum channel-to-channel phase difference of 10°. Various system design problems are discussed. These include the choice of transducers to function in the high-temperature high-vibration environment of the silo, the equalization of phase shift between the data channels, and the phase matching of filters for space correlation. Representative samples of data obtained with the system are used for illustration.
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