This text aims to link each of the specific aspects involved in the passive infrared detection process to foundational physical principles. Following a development of the basic radiometric laws and units the text is organized around three main topics: thermal radiation of sources and electromagnetic wave propagation through the atmosphere; a comprehensive description of infrared detection systems from the most up-to-date components to equipment either in use or in development; and a detailed presentation of the two most common applications, infrared observation and temperature measurement. Since the text provides all the necessary theory and relationships, together with an in-depth look at the practical side of infrared detection, it is an aid to both physicists and engineers in order to specify appropriate solutions to their specific problems. It is also a guide for technicians to check the conditions required for temperature measurement or thermal image analysis.
Some parts of the text have been used for several years in lectures, consequently, many students have contributed directly or indirectly by their questions and reactions in selecting the topics and clarifying the presentation, resulting in a book that is ideal for both graduate and higher undergraduate courses. Equally it can be used as a reference for students entering this multidisciplinary subject.