Eugene, Oregon (corporate office)
541-345-1075

Portland, Oregon
541-255-8780

Seattle, Washington
541-228-6851

Medford, Oregon
541-953-0039

ground penetrating radar

About GPR Data Inc.

GPR Data, Inc. established in 1998, is a company using Ground Penetrating Radar for non destructive investigation of earth and concrete. Based in Eugene, Oregon GPR Data Inc. has a servicing area which covers the globe. GPR Data has worked in countries and conditions all over the world. We strive to provide the most innovative solutions to your problems. GPR Data uses the latest radar technology available and each member of our team is certified in Radar Engineering and Evaluation.

What is in and beneath soil and concrete is our business. Investigations in sub-surface range from 1 inch to 300 feet depending on local conditions. From air voids and delaminations in concrete to bedrock and soil, to gem bearing vugs in pegmatic flows, we can find what you’re looking for.

Our Team Leaders

michael big mike edwards

Michael “Big Mike” Edwards, with a background in business and heavy construction, is shown here conducting a chloride corrosion deterioration study of the Burnside Bridge, in Portland, OR.

matthew data man edwards

Matthew “Data Man” Edwards, with a background in geophysics, is shown here conducting a structural evaluation of a concrete dam abutment in Brownsville, OR.

What is Ground Penetrating Radar?

Ground penetrating radar is a non-destructive geophysical method that produces a continuous cross-sectional profile or record of subsurface features, without drilling, probing, or digging. Ground penetrating radar (GPR) profiles are used for evaluating the location and depth of buried objects and to investigate the presence and continuity of natural subsurface conditions and features.

Ground penetrating radar operates by transmitting pulses of ultra high frequency radio waves (microwave electromagnetic energy) down into the ground through a transducer (also called an antenna). The transmited energy is reflected from various buried objects or distinct contacts between different earth materials. The antenna then receives the reflected waves and stores them in the digital control unit.

GPR works by sending a pulse of energy into a material and recording 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, or trace. Reflections are produced whenever the energy pulse enters into a material with different electrical conduction properties (dielectric permittivity) from the material it left. The strength, or amplitude, of the reflection is determined by the contrast in the dielectric constants of the two materials. This means that a pulse which moves from dry sand (diel of 5) to wet sand (diel of 30) will produce a very strong, brilliantly visible reflection, while one moving from dry sand (5) to limestone (7) will produce a weak reflection.

what is gpr

Advantages

GPR measurements are relatively easy to make and are not intrusive. Antennas may be pulled by hand or with a vehicle from .8 to 8 kph, or more, that can produce considerable data processing. Graphic displays of GPR often resemble geologic cross sections. When GPR data are collected on closely spaced (less than 1 meter) lines, these data can be used to generate dimensional views of radar data greatly improving the ability to interpret subsurface conditions.