Overview of gas sensor technology

Various kinds of gas sensors have been developed or proposed and, some of them have been recognized as key devices to monitor, handle or control of gases for various purposes. Overview of gas sensor technology is tried through brief description of the background of the technology, introduction of representative gas sensors and their construction principles, introduction of a variety of gas sensor markets, mature through challenging, introduction of fundamental aspects of semiconductor gas sensors as a case study, and presentation of some proposals for next generation technology.