Scene Change Artifacts in Fourier Transform Spectroscopy of Temporally Changing Sources

By Anthony M. Young

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.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.

This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.

As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

• Format: Paperback
• Language: English
• ISBN: 1249594316
• ISBN13: 9781249594314
• Release Date: October 2012
• Publisher: Biblioscholar
• Length: 58 Pages
• Weight: 0.21 lbs.
• Dimensions: 0.1" x 6.1" x 9.2"