VitaTech Engineering was commissioned to record and assess the DC and AC extremely low frequency (ELF) electromagnetic interference (EMI) levels within the aptly named Bullet Building, a concrete facility designated for biomedical research in Atlanta, Georgia. The facility lies adjacent to the active Norfolk Southern railroad, composed of nine racks. The objective of this EMI study was to record DC/AC ELF EMI emission data from passing trains and other ambient sources within and outside of the facility, and analyze the suitability of using this building as a scientific research facility. The EMI site survey was performed on August 8th, 2007 from 11:00am to 3:30pm by EMF Technician, Greg Slonka.
Recorded AC (Alternating Current) ELF EMI Data as Contour Plot
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The above graphic presents the contour plot recorded on site. This "bullet" shaped building intends on containing a senstive laboratory area composed of SEMs, TEMs, NMRs, MRIs and other research tools. This type of environment requires consideration, and VitaTech recorded AC measurements to compare the ambient emission profile to the recommended thresholds of the proposed tools.
Note how the ambient magnetic emission profile displays the ground current loop contained on site.
Recorded DC (Direct Current) Spot Measurements |
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The above graphics present the direct current measurements recorded within the "bullet" shaped building. Due to this site's proximity to nuemrous railroad tracks, a DC EMF survey was performed to evaluate the effect of their traffic onto the area designated for sensitive scientific instruments.
Note how numerous instances can be recorded with just one assessment.
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