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 Is GPR a safe technique? Yes. While "Ground Penetrating Radar" may sound like a hazardous technique, it is extremely safe and emits roughly 1% of the power of a cellular phone. Can GPR locate non-metallic subsurface objects? Yes. Because GPR works differently from a metal detector, it can accurately locate both metallic and non-metallic subsurface objects. How deep can GPR "see" to locate targets? Penetration depth depends greatly on the material being surveyed and the antenna being used. Lower frequency antennas can penetrate further but with a lower resolution. In general, dry sandy soils with little salt content return excellent survey resolution, but heavy clay-based soils are difficult to penetrate with GPR. In some situations, penetration depth may be limited to a few feet or less within clays, whereas pipes residing in sandy soils could be detected at depths up to 30 feet. Penetration depth for concrete is typically 18" or more. Can GPR be used with survey data? Yes. Our GPR systems work seamlessly with coordinate data collected through engineering surveys. The resulting data file links each target with its coordinates for use in creating drawings and CAD files. Does GPR interfere with the operation of any other equipment? With any transmitter, there is always a risk of interference; however, Atlantic Subsurface Imaging's FCC certified equipment emits very low powered electromagnetic pulses, which are heavily attenuated and dispersed by the material being scanned. With Antennas contacting the surface of the ground or structure being surveyed, all transmitted EM energy is directed into the ground or structure; no radiated energy is transmitted to the surrounding area. According to GSSI, the manufacturer of our equipment, at no time in the past 30 years has the FCC recorded any GPR interference with other receivers. Does any equipment interfere with the operation of GPR? Since GPR operates by transmitting and receiving electromagnetic (EM) energy at a particular frequency, cellular phones, two-way radios and pagers should be turned off as they also transmit EM energy and will interfere with a survey. If you must have them on, it is essential to keep these devices at least 25-30 feet away from the antenna. Heavy electrical motors and transformers can also potentially cause interference. |
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