This paper describes a chemical alarm system based on ion mobility spectrometry. The system consists of an ion mobility cell, a microprocessor, and an operator interface. The unit is designed to sound an alarm on specific chemical vapors. The microprocessor triggers the cell, collects and filters the signal, and implements a decision process based on linear discriminant functions. The paper describes the overall system and looks at the filtering and decision processes in detail.
Joseph E. Roehl,
"Microprocessor Controlled Chemical Detection And Alarm System Based On Ion Mobility Spectrometry," Optical Engineering 24(6), 246985 (1 December 1985). https://doi.org/10.1117/12.7973614