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Publisher: Storming Media
Jay A. Orson
The remote observations of the temporal and spectral characteristics of the infrared (IR) emissions from exploding ordnance have been correlated with explosion conditions. A Bomem MR-154 Fourier Transform Interferometer with two detectors, InSb and HgCdTe, and a 75 mrad telescope was used to record spectra in the 1.3 - 20 micrometers range. Data was collected at spectral resolutions of 16 /cm and 4 /cm and temporal resolutions of 0.045 s and 0.123 s respectively. Two field tests were conducted: (1) a set of dynamic drop explosions and (2) a series of static detonations. In most events, the temporal profile for certain bands indicate a rapid, intense signature, followed by a secondary maximum and a long-term decay of up to several seconds. A second class of temporal profiles were characterized by an event initiation, followed by an increase in apparent radiance to one maximum, followed by a long-term decay. Sensor fusion between the FTIR instrument and four 200 Hz InSb radiometers is quite promising. The FTIR temporal profiles, calibrated for absolute radiance, compare within 8% in three independent bands and within 30% in the fourth band. The degree of temporal overlap as a function of frequency for a pair of detonation events, provides a direct indication of the ability to discriminate between explosion conditions. Overlap analysis provides quantification of the repeatability of an explosive condition, and the discrimination between look angle and explosive type. Additional preliminary analysis mechanistically describes all events as decaying gray bodies.Jay A. Orson is the author of 'Collection of Detonation Signatures and Characterization of Spectral Features' with ISBN 9781423534846 and ISBN 1423534840.
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