Infrasense Carries Out GPR Layer Thickness Survey on Carriage Road in Acadia National Park

Infrasense recently completed a ground penetrating radar (GPR) survey of a stone carriage road around Eagle Lake in Acadia National Park in Bar Harbor, Maine. The objective of analyzing this hiking road is to report thicknesses of all material layers for rehabilitation planning efforts.

In the July of 2019, Infrasense performed both a ground-coupled and air-launched GPR survey along the full extents of a stone carriage road in Acadia National Park in Bar Harbor, Maine. The thickness survey was carried out during daytime hours with minimal disruption to the road’s foot-traffic. The ground coupled survey implemented a 900-MHz antenna and SIR-4000 control unit manufactured by GSSI, Inc. of Nashua, NH. Three lateral offsets were scanned down the length of the 7-mile road. Similarly, the air launched survey implemented the SIR-4000 control unit with a 1-GHz antenna.

The use of two different Ground Penetrating Radar technologies gave Infrasense engineers a more well-rounded picture of the sub-surface strata along the road. The results included layer thickness plots showing the depth changes of the 2 layers of stones and top layer of crushed stone dust comprising the carriage road.

About Infrasense, Inc. 
Since 1987, Infrasense, Inc. has applied advanced technologies to address the most difficult challenges in subsurface scanning. Infrasense’s engineers nondestructively extract critical information from a diverse range of structures. In addition to providing ongoing subsurface evaluation services to clients across the country, the firm has also conducted numerous research programs to advance the field of subsurface detection and nondestructive evaluation. To learn more about Infrasense and the services we provide, visit our website:

Survey Vehicle Setup with 1GHz (left) and 900 MHz antenna (right)

The survey implemented a ground coupled 900-MHz antenna and SIR-4000 control unit