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II. Review of Gas Sensor Terminology
By Peter John Burke (ed)
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From Nanotubes And Nanowires
II. Review of Gas Sensor TerminologyGas sensors must meet a variety of criteria in order to be practical. The sensor must respond within a relatively short time period to give an accurate assessment of the current impurity concentration. Response time is usually used to specify the time interval required for the sensor to stabilize at its final value. Other terms are sometimes used to characterize the response time such as rise time. This term is used to characterize the time required for the sensor response to reach a certain percentage of its final value. Sensors should also be reusable for wide acceptance. The characterization of how long the sensor takes to return to its initial state is its recovery time. Recovery time generally refers to the amount of time required for the sensor to stabilize at its initial state. Fall time (or rise time depending of the sensors response) may also be used and refers to the time interval required for the sensor to return to some percentage, usually ninety, of its initial state. Recovery is one of the main obstacles of carbon nanotube based sensors, which can take several hours. Sensitivity is used to characterize the change in the sensor's response for a given concentration of gas. Obviously, the amount of changes for a given concentration of gas is of primary importance. In this paper sensitivity will refer to the sensor response, characterized by frequency shift, divided by the concentration in ppm. The linear range of the sensor...
Copyright World Scientific Publishing Co. Pte. Ltd. 2007 under license agreement with Books24x7
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