Opsis open-path monitor versus conventional point samplers in a field study

Hans S. Hallstadius; Robert K. Stevens; Charles Patrick Conner

doi:10.1117/12.210796

31 May 1995 Opsis open-path monitor versus conventional point samplers in a field study

Hans S. Hallstadius, Robert K. Stevens, Charles Patrick Conner

Proceedings Volume 2365, Optical Sensing for Environmental and Process Monitoring; (1995) https://doi.org/10.1117/12.210796
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

During late summer of 1993 a field study took place in Baytown, Texas, where a comparison was made between the Opsis open-path system and conventional point sampling monitors. Simultaneous measurements of the three criteria pollutants sulfur dioxide, nitrogen dioxide, and ozone were made during a time period of a month, including data on wind speed, wind direction, and temperature. This study was made in an area with numerous major local sources of pollution. The degree of agreement between the open-path system and the point measurement system depended on the gas being measured. Ozone, which is well mixed, showed very good intercomparison whereas SO₂ showed poor intercomparison from time to time. By studying the discrepancies as function of the wind direction, interesting results were obtained.

Citation Download Citation

Hans S. Hallstadius, Robert K. Stevens, and Charles Patrick Conner "Opsis open-path monitor versus conventional point samplers in a field study", Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); https://doi.org/10.1117/12.210796

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