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Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. It is a non-intrusive method of surveying the sub-surface to investigate underground utilities such as concrete, asphalt, metals, pipes, cables or masonry. [ 1 ]
Microwave imaging is a science which has been evolved from older detecting/locating techniques (e.g., radar) in order to evaluate hidden or embedded objects in a structure (or media) using electromagnetic (EM) waves in microwave regime (i.e., ~300 MHz-300 GHz). [1]
In general, radar systems perform foliage and ground penetration more effectively with lower frequencies, because longer wavelengths can penetrate opaque structures deeper than shorter wavelengths. [ 11 ] [ 12 ] But in exchange for greater penetration capabilities, the lower frequencies provide a lower image resolution .
In surveys of a potential archaeological site, features cut into the ground (such as ditches, pits and postholes) may be detected, even after filled in, by electrical resistivity and magnetic methods. The infill may also be detectable using ground-penetrating radar. Foundations and walls may also have a magnetic or electrical signature.
In February 2014, SRI announced a "photonics-based testing technology called FASTcell" for the detection and characterization of rare circulating tumor cells from blood samples. The test is aimed at cancer-specific biomarkers for breast, lung, prostate, colorectal, and leukemia cancers that circulate in the bloodstream in minute quantities ...
Electromagnetic methods, such as magnetotellurics, ground penetrating radar, transient/time-domain electromagnetics, and SNMR. Borehole geophysics, also called well logging. Remote sensing techniques, including hyperspectral imaging. Many other techniques, or methods of integration of the above techniques, have been developed and are currently ...