Direct comparisons of FTIR with conventional analyzers for the real-time measurement of vehicle emissions

Steven R. Lowry; Robert E. Klebba; Jay P. Roberts

doi:10.1117/12.210785

31 May 1995 Direct comparisons of FTIR with conventional analyzers for the real-time measurement of vehicle emissions

Steven R. Lowry, Robert E. Klebba, Jay P. Roberts

Proceedings Volume 2365, Optical Sensing for Environmental and Process Monitoring; (1995) https://doi.org/10.1117/12.210785
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

Although FTIR is rapidly being recognized as a more reliable analysis technique that requires significantly less calibration than conventional analyzers for measuring automotive exhaust emissions, there is still a great deal of concern over the ability of FTIR data to correlate with the techniques presently in use. In this paper we will describe the results of several tests designed to compare the FTIR results with these other techniques: flame ionization detector for hydrocarbons, non-dispersive infrared for CO and CO2 and chemiluminescence for NOx. Measurements were made in the laboratory using a conventional US-75 test facility and other tests were acquired in parallel with the conventional analyzers for direct comparisons. In all of these tests the measurements were performed on diluted exhaust samples from a CVS system, but we will discuss the use FTIR for on-dilute combustion samples. We will also present results for several non-regulated species such as methanol, formaldehyde, N2O and ammonia. We will report on the results of using FTIR to calculate the non-methane hydrocarbon value (NMHC) and how FTIR can be used to directly measure other components in vehicle emissions or combustion processes. The overall correlation between the FTIR analyzer and the conventional techniques was quite good. In the case of the IM-240 test there were only two tests out of 45 where there was disagreement on the pass/fail assignment.

Citation Download Citation

Steven R. Lowry, Robert E. Klebba, and Jay P. Roberts "Direct comparisons of FTIR with conventional analyzers for the real-time measurement of vehicle emissions", Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); https://doi.org/10.1117/12.210785

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