Portable digital subsurface sounding radar carried by a single operator. The unit is designed for solving a broad range of geotechnical, geological, environmental, engineering and other wherever nondestructive operational environmental monitoring is needed. In the sounding process, the operator is getting real-time information as a radiolocation (sometimes also referred to as radargram) on a display. At the same time, data are recorded on a magnetic disc for further use (processing, printout, interpretation, etc.).
Complete georadar set includes a central unit with a Notebook-type computer** mounted on a special platform, a set of antennas for various sounding frequencies, software, various accessories 10 Notebook Pentium II 200, 4 Gb, 24 k ram, - **As a rule, a Notebook-type computer is not included in a standard supply. Users may use their own computers for cost saving purposes. Still, computer may be included in the supply on a specific request and at an additional charge.
Packed georadar. The central unit is placed in a special metal case together with the battery, cablesand other accessories. When shipped to a customer, each item is packed in a special carton. Antennas are made dust/sprayproof and may be even immersed in water for a short time. Surface antennas have vinilplastic substrates with extremely high abrasion resistance. Till now, we haven't received from our customers any requests for substrate replacement. All georadar parameters are computer controlled, therefore many hardware operation features are described in seconds.
Use of a specific antenna is determined by a sounding task. Higher sounding frequency means better resolution, but with more significant electromagnetic wave attenuation in the environment, resulting in lower sounding depth; and vice versa - lower frequency may lead to a larger penetration depth at the sacrifice of poorer resolution. Moreover, lower frequency produces larger initial insensitivity area ("dead" zone) of a georadar. A table below shows relationship between resolution, "dead" zone and sounding depth with reference to the antenna used. It is assumed that sounding is made in a soil whose relative dielectric permittivity is equal to 4 and specific attenuation is 1 to 2 dB/m. Depth of investigation is understood to be detection depth of a flat boundary with reflectance equal to 1. Note that these data are rather approximate and are strongly dependent on parameters of the environment sounded.
DIPOLE 38-150 MHz FOR HIGT DEPTH UP TO 30 MT. = 90 FEET
|Parametros de Antena||2 GHz||900 MHz||500 MHz||300 MHz||150 MHz||75 MHz||38 MHz|
|Resolución en metros||0.06-0.1||0.2||0.5||1.0||1.0||2.0||4.0|
|"Zona Muerta" en metros||0.08||0.2||0.5||1.0||1.0||2.0||4.0|
|Profundidad en metros||1.5-2||3-5||7-10||10-15||7-10||10-15||15-30|
To transform measure unit in feet- 1 mt = 3 feet We are always ready and willing to render you consulting services with regard to applications of any particular antenna for solving specific tasks. Specifications
Central unit: Sounding time range: 50 to 2000 nanoseconds, Transmitter pulse repetition: 115 Khz, Scan rate (max): 14 scans per second, Samples in trace: 128, 256 or 512, Range gain: user selected linear or exponential time variable gain function, Gain control range: 0 to 80 dB, Dinamic range: 128 dB, Filter: user selected run-time high-pass filter, Sounding modes: continuous or stepped stacking
Data transfer: through serial port RS-232C to notebook-type computer
Input power: 12V DC belt-mounted rechargeable battery pack with operating range 10.5-13 Volts Battery capacity: 6.5 Amp*h Consummed current: 0.7 Amp Dimentios (without PC): 35x30x5.5 cm Weight (without PC): 3.0 Kg:&127
When shipped to a customer, the central unit is placed in a special metal case together with diskette and accessories. Accessoires include: Hermetic lead battery 12 Volts, 6.5 Amp*h Belt-mounted bag for battery Power supply cable Automatic charger for battery Computer cable Antenna cable Cable for battery charging External power supply cable Reserve fuses User's Manual
Antenna 2 GHz Antenna type: surface Transmitter pulse amplitude: 100 Volts Receiver gain: 17 dB Receiver sensitivity(1): 80 mcV Resolution(2) : 6 cm "Dead" zone(2) : 8 cm Depth of sounding(2) : 2 m Dimentions: 27x13x13 cm Weight: 1.5 Kg Power: 12 Volts, 0.27 Amp. by cable from central unit
Antenna 900 MHz Antenna type: surface Transmitter pulse amplitude: 120 Volts Receiver gain: 17 dB Receiver sensitivity(1): 70 mcV Resolution(2) : 20 cm "Dead" zone(2) : 20 cm Depth of sounding(2) : 5 m Dimentions: 43x22x4 cm Weight: 2.0 Kg Power: 12 Volts, 0.27 Amp. by cable from central unit
Antenna 500 MHz Antenna type: surface Transmitter pulse amplitude: 400 Volts Receiver gain: 19 dB Receiver sensitivity(1): 50 mcV Resolution(2) : 50 cm "Dead" zone(2) : 50 cm Depth of sounding(2) : 10 m Dimentions: 69x32x4 cm Weight: 4.0 Kg Power: 12 Volts, 0.35 Amp. by cable from central unit
Antenna 300 MHz&127 Antenna type: surface Transmitter pulse amplitude: 400 Volts Receiver gain: 20 dB Receiver sensitivity(1): 40 mcV Resolution(2) : 1.0 m "Dead" zone(2) : 1.0 m Depth of sounding(2) : 15 m Dimentions: 98x52x4 cm Weight: 10.0 Kg Power: 12 Volts, 0.35 Amp. by cable from central unit
Antenna 38-75-150 MHz Antenna type: dipole, air-coupled Transmitter pulse amplitude: 200 Volts Receiver gain: 10 dB Receiver sensitivity(1): 50 mcV Resolution(2) : 4.0 m (38 MHz), 2.0 m (75 MHz), 1.0 m (150 MHz) "Dead" zone(2) : 4.0 m (38 MHz), 2.0 m (75 MHz), 1.0 m (150 MHz) Depth of sounding(2) : 10 m (38 MHz), 15 m (75 MHz), 30 m (150 MHz) Dimentions: 98x52x4 cm Weight: 10.0 Kg Power: 12 Volts, 0.35 Amp. by cable from central unit Antenna has three working frequencies: 38, 75 or 150 MHz.
Changing of frequency is possible by appliing of additional dipole sections. Remarks: (1) -means sensitivity, limited by noise (2) - It is assumed that sounding is made in a soil whose relative dielectric permittivity is equal to 4 and specific attenuation is 1 to 2 dB/m. Depth of investigation is understood to be detection depth of a flat boundary with reflectance equal to 1. Note that these data are rather approximate and are strongly dependent on parameters of the environment sounded.
Software for georadars "Prism" software is designed for georadar parameter control, sounding data reception with simultaneous computer display and magnetic disc file record as well as for file processing and printout. There are no special requirements to the computer, the only requisite being IBM compatibility. A proprietary (original) record format is used for files; this format is exhaustively covered in the User's Manual. The software comprises converters used to have files converted to well known formats, such as SEG-2, DZT (Geophysical Survey Systems, Inc.), pE (Sensors & Software, Inc.).
All of the georadar parameters (except the on/off function) are controlled via a computer which facilitates operation of the hardware. In the course of tuning the radar and performing the sounding, the software outputs error messages if parameter settings are incorrect, and suggests proper steps to be taken. Georadar data reception may be performed continuously (basic mode) or with stepped stacking. The continuos reception mode enables maximum spatial (horizontal) resolution. Stepped stacking is used to achieve possible maximum sounding depth and to solve special tasks (tomography, etc.) while requiring a longer sounding time.
To locate a sounding profile obtained, the operator may press a pushbutton to input the so-called 'marks' when passing through stations or any reference points. These marks will be displayed on the profile as vertical lines with respective numbers at the top. Upon completion of the sounding (or any time later), it is possible to input a text comment into the file to indicate the sounding area, the sounding target, and the like. Various sounding file processing types are provided for in "Prism" software to have the signals of interest segregated and noise or no-data signals suppressed. At present, the following procedures are available: Vertical HP and LP filtering Horizontal HP anf LP filtering Matched filtering Inverse filtering Hyperbolic summation Power envelope definition Energy envelope definition Digital gain function Background removal Median filtering 'Reversing' of profile Furthermore, "Prism" software allows to make measurements and evaluation of various signal parameters: amplitude measurements of signals and delays, spectrum viewing of the entire or partial route, measurements of the target occurrence depth and the environmental dielectric permittivity by superposing a synthetic hyperbola, profile scaling, etc. Using a converter routine for having files converted to a known file format will make it possible any other software supporting such a file format. There are numerous software routines of the kind worldwide, and they are used mainly in geology and geophysics.
Some application areas for georadars and tasks Bedrock depth determination Mining development Mineral exploration Glaciology Archaeology Forensic medicine Cavities and voids detection Defectoscopy Profiling of walls, floors, ceilings Searchinf for different metallic and non-metallic objects (local items, pipes, wires etc.), burried into ground Water table determination Ground wastes investigations Industrial wastes deposits mapping Paleobed river detection River or lakes bottom profiling Mapping of melted zones in permafrost Other similar tasks
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