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Colloquium: Tim Johnson

Bourns Hall A265

Engine Emissions Particle Measurement

Tim Johnson
TSI Incorporated
St. Paul , Minnesota

There have been recent changes in regulations for engine emissions. The mass emission limits have be lowered to the point where filter measurements are reaching their limits of resolution. To achieve lower emission levels it is useful to get more information about the emissions to better understand the combustion process and to get real time measurements to determine when emission peaks occur. In this talk a number of instruments will be described that can be used for engine emission measurements. They include instruments for counting particles, measuring size distributions and measuring real time mass.

Tim has a Bachelors degree in Physics from Macalester College in St. Paul Minnesota. He has worked at TSI Incorporated for over 30 years and has worked with the Particle Instruments products for over 18 years. He is currently Technical Support Specialist for the Particle Instruments products. He supports instruments used in detecting, sizing and measuring concentrations of nanoparticles in the air. His current emphasis is with products for measuring particles from engine exhaust.