books.google.com - This book aims to link each of the specific aspects involved in the detection process to foundational physical principles. Following a development of the basic radiometric laws and units the text is organized around three main topics: (1) thermal radiation of sources and electromagnetic wave propagation...http://books.google.com/books/about/Passive_Infrared_Detection.html?id=X-aFGcf6pOEC&utm_source=gb-gplus-sharePassive Infrared Detection
