Title :
A zirconia-based lambda gas sensor with pseudo-reference
Author :
Benammar, Mohieddine ; Maskell, William C.
Author_Institution :
Energy Technol. Centre, Middlesex Univ., London, UK
fDate :
2/1/1995 12:00:00 AM
Abstract :
A sensor operating on the potentiometric principle without the need for a stable reference gas is described. This was achieved by using a miniature zirconia pump-gauge device including a diffusion path between its internal volume and external atmosphere. A pseudo-reference oxygen partial pressure was generated within the internal volume and acted as a reference for potentiometric determination of the external oxygen partial pressure. The sensor was tested in the normalized air-to-fuel range 0.7 to 1.7 and displayed a characteristic similar to that of a conventional potentiometric sensor with a fixed stable reference, e.g. air
Keywords :
electric sensing devices; gas sensors; oxygen; potentiometers; zirconium compounds; O2; ZrO2; air-to-fuel ratio; combustion systems; diffusion path; external atmosphere; fixed stable reference; internal volume; lambda gas sensor; miniature zirconia pump-gauge device; noxious emissions; potentiometric determination; potentiometric principle; pseudo-reference; pseudo-reference oxygen partial pressure; stable reference gas; Atmosphere; Cathodes; Electrodes; Electrons; Energy states; Gas detectors; Sensor phenomena and characterization; Solids; Temperature sensors; Testing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
