Abstract: The present invention provides a detector for detecting molecules conveyed through a gaseous medium. For example, the molecules may be emitted from sewage, meat production plants, or detection of the molecules may give information about a state of health of a human or an animal. The detector comprises sensors which have sensing surfaces. Each sensing surface has an electrical property that changes in response to the molecules when the molecules are coupled to the sensing surface so that the coupled molecules can be sensed by detecting the changed electrical property. The sensors are sensitive for a sulphur compound and for an organic compound. The present invention also provides a method of fabricating a detector for detecting molecules conveyed through the gaseous medium.

Abstract: The present invention provides a method of monitoring a predetermined type of molecule conveyed through a gaseous medium. The method comprises that step of positioning at least one electronic detector for detecting the predetermined type of molecule. The method also comprises the steps of measuring molecules of the predetermined type to detect a quantity of the molecules and producing electronic data associated with the quantity of molecules. The method further comprises the step of monitoring changes in the electronic data so as to provide information that can be used to control a source of the predetermined type of molecule.