Abstract: An apparatus and method for measuring the infiltration flow rate into the passenger compartment of a moving motor vehicle includes a controlled source of a distinct, miscible gas such as carbon dioxide (CO2) a plurality of sensors disposed about the compartment to continuously monitor the concentration of such miscible gas over time and a multi-channel data storage device which discretely stores the concentration data from such plurality of sensors for later analysis and computation. The decay rate of the miscible gas concentration is a function of the infiltration/exfiltration rate.

Abstract: An integrating transient recorder for time array detection of ions within an ion source extraction. The arrival times of all ions having various mass-to-charge ratios are calculated and integrating or peak detecting circuitry is activated just prior to the calculated time of arrival of each ion, and then only for a time duration in accordance with a predetermined data collection time window sufficient to enable each ion mass value to be completely measured. An analog-to-digital converter converts the area or peak analog signal for each ion into a corresponding digital signal and outputs the digital signals to a plurality of FIFO buffers. The FIFO buffers are read out for each successive transient by a digital signal processor and summed over a predetermined number of sequential transients in a mass locked registry creating a file of ion intensities versus mass-to-charge ratio of all ions detected.