Ground penetrating radar – a mobile device that is used to produce a continuous section of the medium ( grading ) and the recording of the data in electronic form for further processing and analysis.
Ground penetrating radar uses the technology of cutting the soil, which does not need to conduct test excavations or control drilling , and the incision is obtained for the whole set depth , limited by technical capabilities used GPR . Therefore, GPR relate to methods of non-destructive investigation and monitoring.
Most of the work GPR get in industries such as construction, including GNB and other trenchless construction methods , geology , military science , archeology , etc.
What are the GPR ? In fact the name ” ground penetrating radar ” – simplified the name used for the convenience of the question. It is more correct to use the term ” subsurface sounding radar instrument .”
GPR consists of several functional units providing comprehensive task of forming and transferring pulses and interpreting the reflected / absorbed signals :
the antenna unit (consisting of several antennas for transmitting and receiving signals of different frequencies) ;
a control unit consisting of a series of opto- electrical converters and cable system ;
recording unit , in the form which is most commonly used laptop.
Operation GPR based on the differences in the reflection of an electromagnetic pulse emitted by the device (usually used frequency range from 400 MHz to 1500 MHz ) , or various objects of various types of soil . Depending on the time of the signal ( from its emission to reception of the reflected signal antenna GPR ) is determined and the depth at which there is a reflective object .
The sequence of the reflected signals are interpreted in the GPR profile, which is called ” section of the medium ” or ” radiogram ” . Based on the radiogram operator makes conclusions about the position of objects and boundaries of different soil layers in the thickness of the object .
The depth at which the GPR survey conducted depends on the frequency of the emitted pulse and the type of soil in which to get cut. The usual depth of GPR studies in soils , easy-to- scan radar (dry sand, frozen soil , limestone and rocks ) , up to 25 m loam ground penetrating radar is less effective .
In studies GPR (more precisely , the antenna unit) is moved over the surface (or on its surface ) of the medium , wherein scanning takes place with a certain step which is advanced models GPR may be several millimeters.
For all its advantages , be aware that ground-penetrating radar – just a sophisticated precision instrument. Therefore, specifying parameters of GPR studies for each object , as well as analysis and interpretation radiogram should engage highly qualified specialist . Only in this case, the ground penetrating radar maximize your potential and help keep you in your business.
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Job radar subsurface sensing device (a common terminology – GPR) is based on the classical principles of radar. Transmitting antenna device emitted ultra short electromagnetic pulses (units and fraction of a nanosecond) with 1.0-1.5 period of quasi-harmonic signal and a fairly wide range of radiation. The central frequency of the signal is determined by the type of antenna. Select pulse is determined by sensing the necessary depth and resolution of the instrument. For the formation of probe pulses used broadband excitation of the transmitting antenna voltage drop (shock excitation method). Emitted in the investigated medium pulse reflected off objects in it or inhomogeneous medium, the medium having excellent dielectric constant or conductivity, received by the receiving antenna, amplified wide band amplifier, converted to digital form by an analog-to-digital converter and stored for further processing. After processing the information received is displayed on the display.
Profiling provides a vertical sectional view of the subsurface environment along the path of measurement in real time. However, the role of the vertical coordinate performs during the pulse to travel from the transmitter to the boundary of the reflecting object and then to the receiving antenna. To convert this “temporary cut” in the real depth is necessary to estimate the velocity of propagation of electromagnetic waves in the environment and take into account the location of the point of reflection about the antenna device.
Propagation velocity of the probe pulse needed to assess the real depth of the objects can be found directly from the temporary cut in the presence of local or on the track linearly extended across the road subsurface object forming at radarogram characteristic hyperbolic trail. Solution corresponding asymptotes of the hyperbola depends on the speed of wave propagation in the medium. Function determining the speed of propagation of electromagnetic waves in a medium according to the diffraction image of a hyperbolic local object in the device has not been implemented and it is expected to available software systems GPR data processing on a computer.
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ground penetrating radar (GPR) There is a wide variety of geophysical techniques used around the world for information underground, some of them are: RESISTIVITY (ELECTRICAL); MAGNETIC; ELECTROMAGNETIC; GPR (ground penetrating radar); SEISMIC; GRAVITY; VIBRATION CONTROL; MARINE SURVEYS; GENERAL purpose ETC.: Geological studies, stratigraphy, study of marine beds, mechanical properties of the subsoil, location of groundwater
KS-Analysis ground penetrating radar K-S Analysis, Gpr German Technology KS 700 The machine consists of (transmitter and receiver), which is fix connected and in sync with the electronic brain. On the machine it is not necessary to exchange the antennas to become diaskopisi at other depths, because its operation is based on different
What is a ground-penetrating radar and how Examination is performed with a special tool – GPR, which is an electronic device. The GPR investigators receive ongoing incision of the environment in which to diagnose. The depth of the study could be as high as 20 meters. Data entry examination is carried
Ground penetrating radar with Android laptop Gepard GPR ground penetration radar is talking to detect objects and underground structures such as pipelines, underground caves, tunnels, foundations and the like. Ground penetrating radar that uses a transmission system unchecked with telescopic sensors to penetrate up to maximum depth of 40 meters. And Gepard
Authentic ground radars, also referred to as GPR, allow the detection of metal targets and the cavities at inaccessible depths to other detection systems. But beware, a GPR is used not as easily as a metal detector. Indeed, there are a number of constraints to respect. Field must be completely dry, even in depth, because
Automatic Setup is the ability to change detectors operating channels operating frequencies to reduce the influence of the surrounding electromagnetic noises. then it is likely that this source-generated electromagnetic waves or their harmonics will coincide with operating frequencies of the detector and, of course, interfere with the detector. Slightly shifting the operating frequency
Georadar is a modern geophysical device designed to detect various objects including metal in different environments. Mobility, comparative compactness and ability to conduct non-destructive monitoring environment with high detail make it unique among geophysical equipment. Ground penetrating radars used for solving engineering and geological, hydrogeological and exploratory tasks, such as: survey of roads, railway embankments,
Ground-penetrating radar is a modern geophysical device whose use for shallow research,Ground-penetrating radar is a modern geophysical device designed for a wide range of tasks. GPR, Ground-penetrating radar, radar, which is used for sensing the environment. Ground-penetrating radar is a modern geophysical device designed to detect various objects including metal. gold metal detector radar
WHAT GEORADAR And its operating principle
GPR (georadar) survey made using a special tool – GPR, which is an electronic device. GPR researchers receive continuous incision of the environment in which the diagnosis is made. Depth study there may be up to 20 meters. Examining the data record is to a file, which allows further conduct research and documentation material using computer equipment.
The operating principle of GPR entirely based on radar: radiation and fixing reflected electromagnetic pulses. Pulse produced by the device and using the transmitter (antenna) is sent to the studied environment. The medium may be any material as concrete, soil, brick wall, etc. The medium may be non-uniform structure, and that reflects the device. On the basis of these studies revealed a variety of voids and inclusions of other materials.
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