Webinars Details - 4C Conference 13043

4C Conference 2020 Webinars

Fenceline Monitoring


James Shinkle


Optical Scientific, Inc. (OSi)


Understanding The Fence-line Large Area 2-Dimentional Wind Measurements With LOA Technology - Fenceline Monitoring


This presentation will discuss LOA (Long-Path Optical Anemometer) technology and how it can be used to help obtain the vertical wind and flux profile. There are many benefits of using a LOA Technology as a tool for tracking movements of large bodies of air, hazardous wind movements and atmospheric turbulence. We will discuss applications where LOA technology had been combined with other instruments to more accurately monitor air pollution movement and wake vortex. Developed in the 1970‘s by ERL/NOAA, LOA simultaneously measures the average wind across the optical beam (crosswind) and the turbulence (CN2) over the measurement path. LOA technology has proven useful in a number of diverse applications, including monitoring pollution drift from Denver to Greeley Colorado, tracking the movement of noxious odor from a large scale hog farm and measuring airflow velocity of HF gases from aluminum smelting operations where it has received EPA Method 14 Equivalency Approval. LOA technology has been extensively field tested as part of NASA’s Airspace Systems Program to help Airports to detect the effects of a wake vortex on or near ground level. The preliminary data indicates that when LOA is combined with open path gas sensors it provides more accurate tools to regulatory bodies to measure and regulate large source emissions. A minimum of three such systems set up around the perimeter of the emission source can measure the total emissions from the site in real time. Using two or more LOAs can provide large area 2dimensional wind vectors that no other sensors could possibly measure. Adding additional sensors three or more LOAs to form a closed contour, provides not only large area 2-dimensional wind vectors, it can also provide the near ground vertical wind (below the inversion layer). This versatile technology results in both very powerful research tool and rugged / time proven operational instrument to provide critical information for large areas wind, dust, pollution and be set up for monitoring and tracking in one, two or three spatial dimensions.




01:00 PM

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