| Frequently
Asked Questions
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Q. How deep can I penetrate with Subsurface Interface Radar?
A. Depth of penetration is dependent on the type of soil/media being
investigated. The best penetration results are obtained in low
conductive/highly resistive soils like dry sands. The poorest
results occur in highly conductive soils like heavy, wet clays. We
normally promote a maximum depth of penetration of 35meters with the
optimum application zone between 0 to 10m. Some examples where
maximum penetration was achieved:
- When coupled directly to granite rock for fracture mapping depth of
penetration exceeded 60 m
- In the snow pack of Greenland surveyors identified buried aircraft 60m.
deep.
SSI has charts identifying approximate dielectric and conductivity
values of various media. Using these numbers as a reference guide
you can determine the expected depth of penetration for a site.
Q. What size targets can I detect with Subsurface Interface Radar?
A.This question usually pertains to the identification of man emplaced
objects like underground utilities. Through years of field
experiences SSI has established a general "rule of thumb" for the
detection of pipe like targets. You need one 0,3m of embedment. In
other words, at 1.7m deep you need a 125mm inch diameter pipe. Like
depth of penetration, the conductivity and dielectric properties of
the media and target play a large role. The proper determination of
resolution is that the target size must be equal to 1/2 the
wavelength of the pulsed energy. A copy of the following paper can
be obtained from SSI and discusses how dielectric constants effect
resolution and reflection strength of various targets.
Assessment of Ground Penetrating Radar Applicability to Specific
Site Investigations:
Simple methods for pre-survey estimation of likely dielectric
constants, target resolution & reflection strengths.
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| Technical
Solutions
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Frequently Asked Questions Technical Solutions
provides questions and answers to many common questions asked by Groundsearch
customers. This can be a valuable resource for solving technical issues without
needing to contact Groundsearch. Of course, we are always happy to provide
technical support to our customers, and all customers should feel free to
contact us at any time if they have any questions concerning our products.
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