Who we are
Since 1988, Sub-Surface Informational
Surveys has been an industry leader in the field of ground
penetrating radar. Using the most advanced technology, we
can provide all of your underground radar needs, immediately
on-site. Areas serviced include all of New England, New
York, New Jersey and Pennsylvania.
SIS is fully insured, professional and quick to respond to our customers needs. Don't waste your valuable time and money on "fly by night" GPR companies. Do it right the first time, and quickly find what you seek with SIS!
How Does GPR Work?
GPR works by sending a tiny pulse of energy into a material
and recording the strength and the time required for the return
of any reflected signal. A series of pulses over a single area
make up what is called a scan. Reflections are produced
whenever the energy pulse enters into a material with different
electrical conduction properties or dielectric permittivity
from the material it left. The strength, or amplitude, of the
reflection is determined by the contrast in the dielectric
constants and conductivities of the two materials. This means
that a pulse which moves from dry sand (low dielectric) to wet
sand (higher dielectric) will produce a very strong reflection,
while one moving from dry sand (low dielectric) to limestone
(which has a close dielectric value to dry sand) will produce a
very weak reflection. While some of the GPR energy pulse is
reflected back to the antenna, energy also keeps traveling
through the material until the pulse signal energy dissipates
(attenuates). The rate of signal attenuation varies widely and
is dependent on the dielectric properties of the material
through which the pulse is passing.
While some of the GPR energy pulse is reflected back to the antenna, energy also keeps traveling through the material until it either dissipates (attenuates) or the GPR control unit has closed its time window. The rate of signal attenuation varies widely and is dependent on the properties of the material through which the pulse is passing.
Sub-Surface Informational Surveys, Inc opens its doors
Sub-Surface become the offical sponsor of Second Chance Ranch Equine Rescue.
SIS celebrates their 20th anniversary.
What is GPR?
Ground-penetrating radar (GPR) is a geophysical
method that uses radar pulses to image the subsurface. This
nondestructive method uses electromagnetic radiation in the
microwave band (UHF/VHF frequencies) of the radio spectrum, and
detects the reflected signals from subsurface structures.
3. Survey Wheel