Another type of sensor array developed by NASA Glenn and its collaborators is for the detection of fires. Fire detection on-board space and commercial aircraft is extremely important to avoid catastrophic situations and to verify the operational status of the vehicle. False alarm rates from the traditional fire detectors can be high with changes in humidity, condensation on the detector’s surface, or contamination from the contents of the vehicle often being responsible for false indications of a fire. The purpose of this work was to produce microsensors to measure a chemical signature of a fire to complement the existing fire detection technology. Two gases of particular interest in fire detection are CO and CO2 and their ratio. The CO and CO2 sensors whose development is discussed elsewhere on this webpage are central to an array to detect species indicative of a fire and provide more reliable fire detection technology. Other sensors can be included in the array to improve the accuracy of the chemical signature and provide indications of conditions which produce false alarms in other detectors. This work is in conjunction with the [FAA]. It was recognized by a 2005 R&D 100 Award for a Multi-Parameter, MicroSensor-Based Low False Alarm Fire Detection System and a NASA 2005 Turning Goals into Reality Associate Administrators Choice Award. This fire detection approach is presently being evaluated for application on the Crew Exploration Vehicle.