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Scene Change Artifacts in Fourier Transform Spectroscopy of Temporally Changing Sources

Scene Change Artifacts in Fourier Transform Spectroscopy of Temporally Changing Sources

Paperback

Technology & EngineeringGeneral EducationPhysics

ISBN10: 1249594316
ISBN13: 9781249594314
Publisher: Biblioscholar
Published: Oct 9 2012
Pages: 58
Weight: 0.21
Height: 0.12 Width: 6.14 Depth: 9.21
Language: English

Improved understanding of midwave infrared (1-5 micron) spectral emissions from detonation fireballs is needed to develop phenomenological models for battle space optical forensics. The ability to measure radiance over a wide band pass at arbitrary resolutions make Fourier-transform spectrometers (FTS) an attractive tool. However, interferometer based spectroscopic measurements can be corrupted when the observed intensity changes during data acquisition. While small, random fluctuations in scene intensity translate into noise, systematic variations introduce scene-change artifacts (SCAs)into Fourier-transformed spectrum. Approximating a detonation fireball as a blackbody radiator, modified with an atmospheric attenuation Tatm, with an exponentially cooling temperature T(t)=T0e -kt, double sided interferograms from an ideal Michelson interferometer were simulated and converted to a measured spectrum Lm to characterize the nature and magnitude of SCAs.

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