Trends & Insights from an Industry Pioneer
About Subsurface Reflections:
The goal of this blog is to share interesting and inspiring articles related to subsurface imaging and geophysics. Written by experts in the field of geophysics, ground penetrating radar, software development and data analysis, this is a source for insights about the practical application of technology in the field of subsurface imaging and a place to shed light on common misconceptions in the industry.
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Ground Penetrating Radar (GPR)
Dr. Peter Annan
Founder & CEO
Peter is the CEO of Sensors & Software. His scientific research has been recognized worldwide with numerous awards for his pioneering work in ground penetrating radar (GPR) instruments and data analysis methods. He has authored multiple scientific publications, patents, and technical reports and served on various government and professional committees.
GPR grid survey was conducted on a busy intersection in New York City. The survey successfully located and differentiated between a PVC natural gas main and an underlying cast iron water line.
GPR can be a powerful tool for mapping the location and depth of metallic, non-metallic, plastic, concrete and asbestos-concrete utilities. Mapping with GPR to systematically cover an area can quickly reveal the distribution and character of multiple buried utilities. GPR surveys on regular grids are now recommended in Subsurface Utility Engineering (SUE) projects.
Plastic and cast iron pipes are not readily located by traditional methods. This site in New York City was one where the location of plastic gas mains and cast iron water lines were in question. Construction design and planning called for completion of Level B SUE mapping of potential conflicts with existing utilities.
GPR was selected as the method of investigation since it could detect both metallic and non-metallic underground utilities. To make a complete study, the locating team used a grid survey approach to create a full subsurface view of the critical area.
A Noggin® 250 MHz GPR in the SmartCart® configuration was used. The 250 MHz system provided the optimal trade-off between depth of exploration and target resolution. The SmartCart provided quick and easy maneuvering of the GPR. (Alternatively an LMX200™ GPR system could have been used to get the same result.)