کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4739913 | 1641141 | 2014 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A temporal and spatial analysis of anthropogenic noise sources affecting SNMR A temporal and spatial analysis of anthropogenic noise sources affecting SNMR](/preview/png/4739913.png)
• We have analyzed the temporal effect of noise sources affecting SNMR.
• We have analyzed the spatial effect of noise sources affecting SNMR.
• We introduce an instrument to measure and analyze noise.
One of the biggest challenges when using the surface nuclear magnetic resonance (SNMR) method in urban areas is a relatively low signal level compared to a high level of background noise. To understand the temporal and spatial behavior of anthropogenic noise sources like powerlines and electric fences, we have developed a multichannel instrument, noiseCollector (nC), which measures the full noise spectrum up to 10 kHz. Combined with advanced signal processing we can interpret the noise as seen by a SNMR instrument and also obtain insight into the more fundamental behavior of the noise. To obtain a specified acceptable noise level for a SNMR sounding the stack size can be determined by quantifying the different noise sources. Two common noise sources, electromagnetic fields stemming from powerlines and fences are analyzed and show a 1/r2 dependency in agreement with theoretical relations. A typical noise map, obtained with the nC instrument prior to a SNMR field campaign, clearly shows the location of noise sources, and thus we can efficiently determine the optimal location for the SNMR sounding from a noise perspective.
Journal: Journal of Applied Geophysics - Volume 110, November 2014, Pages 34–42