The infrared spectrum has provided a rich, available technology for the accomplishment of many important and practical tasks. This tutorial text provides a brief introduction to the language, processes, and some of the instrument design techniques that are available to the engineer today. It arose from lectures given at about ten different tutorial sessions at meetings of SPIE, the International Society for Optical Engineering. The material was adapted from a full, one-semester, three-hour course, given at The University of Arizona for twenty five years.
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