A proportional air-fuel ratio zirconia oxygen sensor

Colvin, Alex D.; Rankin, James; Carduner, Keith R.

doi:10.1016/0925-4005(93)80002-s

Cited by 6 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The emf of the sensing cell is normally fixed at 300-450 mV with respect to the air reference, which gives an oxygen pressure of about 10 −7 -10 −10 atm in the cavity at 800°C. The current that must pass through the pumping cell to maintain a constant oxygen pressure (10 −7 -10 −10 atm) in the sensing cell is used as an output of the sensor [28][29][30][31]. In the oxidizing atmosphere of a lean combustion gas, oxygen has to be pumped out to reduce the oxygen pressure in the cavity as shown in Fig.…”

Section: Oxygen Sensormentioning

confidence: 99%

Solid-state electrochemical gas sensors

Park

Fergus

Miura

et al. 2009

Ionics

137

View full text Add to dashboard Cite

The solid-state electrochemical principle has been a selective and accurate way of sensing chemical components in various environments, including liquid metal, for an extended period of time. Since after Carl Wagner's interpretation of zirconia, there appeared many advances in chemical sensor applications. The electrochemical techniques for the chemical measurements have, in general, several major advantages compared to other methods. The information of interest is directly converted into electrical signal which may be employed in electronic circuits. Electrochemical measurements are always selective for the quantities that undergo the electrochemical redox reaction. In most cases, reactions at equilibrium are considered, but techniques have also been developed to be able to use kinetic limit. Furthermore, the signal is independent of materials properties, such as the ionic conductivity or impurity as long as it is a predominant ionic conductor. Depending on the type of application, voltage or current measurements are employed. While potentiometric method commonly allows measuring chemical species over a wide range of concentration, amperometric sensors generally cover a quite limited range but have a much higher resolution. In this paper, various principles of electrochemical techniques to measure the chemical quantities are introduced. And there are many examples of the status of researches on electrochemical sensors, such as oxygen sensor, carbon dioxide sensor, NO x sensor, SO x sensor, and hydrogen sensor.

show abstract

Section: Oxygen Sensormentioning

confidence: 99%