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Title: The testing and characterisation of solid-state gas sensors
Author: Mousa, A. A.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1994
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The early and reliable detection of incipient or developing fires is an essential aspect of safety in mines. Products Of Combustion (POC) resulting from pyrolysis of materials commonly found in mines have long been recognised as an indicator for the onset of a fire. In particular, the gaseous POC are regarded as the most important fire signature because they are produced during the early stages of the combustion process. During the last decade, Taguchi (TGS) No.711 semiconductor gas sensors have been utilised for detection of gaseous POC in British coal mines. The work reported in this thesis describes a British Coal sponsored research programme which thoroughly characterised more than fifty gas sensors of fifteen different types, including many new commercial, experimental and in-house devices. These employ a variety of chemical formulations but are all based on tin dioxide (SnO2). The preliminary stages of these studies followed a protocol for the assessment and comparison of device behaviour and produced data concerning the optimum heater power, sensitivity, ambient temperature and humidity dependence, and selectivity of these sensors. In the subsequent stages of this programme, the response of these sensors to POC from materials commony encountered in coal mines, and which may be involved in a fire (e.g. coal, wood, PVC conveyor belts, polyurethane electrical insulation and neoprene), have been studied. These tests were conducted in a purpose-built rig which allowed for the material sample to be heated in the range ambient-375oC and for gaseous POC to be passed over the sensors which were house in a test vessel.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available