Quantification of a single-component gas in air with a microhotplate gas sensor using partial least squares techniques

摘要

Abstract: Microhotplate gas sensors can be operated in rapid temperature programmed sensing (TPS) modes due to their small size and mass. The temperature sequences can be optimized in order to enhance a sensor's sensitivity and to discriminate among similar volatile organic compounds. In the paper, we demonstrate that quantification of a single component gas in air with a microhotplate gas sensor operated in a TPS mode is possible by using partial least squares techniques. The calculations of the PLS models are based on gas sensitivity which is the ratio between the dynamic responses to the test gas and to air. We show that the gas concentration can be predicted accurately for different test gases, different temperature sequences, and different metal-dosed microhotplate gas sensors. THus the qualitative and the quantitative analysis of a single component gas in air can be achieved with a single microhotplate gas sensor operated in TPS mode. !11