Computer controlled data acquisition and signal processing for continuous combustion gas sampling

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Abstract
This paper is concerned with gas sampling in the continuous mode. In this mode of operation the sampling probe is moved at low speed and gas analysis is conducted on line. Probe displacement, data acquisition and signal processing are performed by a computer. Distortions associated with the continuous mode of operation are described. The sources of distorsion considered are related to the analyser response function, the sampling line time lag, the mixture evolution of the sampled gases in the line, and the variation of the mass flow in the line due to temperature changes of the sampled gases. A system transfer function is then determined. The algorithm used to restore the input signal from the output signal is based on a constrained iteration method. Tests and applications are given to prove that the method is practical. The main advantage of the method is that it considerably reduces the exploration time and allows detailed studies of flow and flame structures

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