Ground Penetrating Radar (GPR)
Working Principle
TBTGPR Series radar uses high-frequency electromagnetic (EM) waves (from low to high frequency) to acquire subsurface information. TBTGPR detects changes in EM properties (dielectric permittivity, conductivity, and magnetic permeability), that in a geologic setting, are a function of soil and rock material, water content, and bulk density. Data are normally acquired using antennas placed on the ground surface or in borehole or in air. The transmitting antenna radiates EM waves that propagate in the subsurface and reflect from boundaries at which there are EM property contrasts. The receiving GPR antenna records the reflected waves over a selectable time range. The depths to the reflecting interfaces are calculated from the arrival times in the GPR data if the EM propagation velocity in the subsurface can be estimated or measured.
Technical Specification
GPR Controller | Dual channel controller (max. upto 8 channels) |
working Channel | 2 channels (equip with laptop) |
ADC bits | 16 bit |
The max scanning speed | 512 scanning/s (sampling points number is 512) |
Sampling points number | 256, 512, 1024, 2048, 4096, 8192 |
Max transmitting frequency | 800kHz |
Collecting modes | Time mode, distance mode and point measurement mode |
Time-window range | 1~8000ns |
Gain range | -10dB~160dB |
Real time processing functions | Correction zero deviation, FIR filtering, IIR filtering, background removal, average among ways, data overlying |
Antenna types | Center frequency | Pulse width | Depth range | Reference depth | Antenna Applications |
Shielded ground-coupling antenna | 2500MHz | 0.4ns | 0.1~0.3m | 0.2m | Building structure, pavement layers,bridge engineering |
1600MHz | 0.6ns | 0.2~0.5m | 0.4m | Building structure, pavement layers, bridge defect inspection | |
900MHz | 1.1ns | 0.5~1.5m | 0.7m | Tunnel lining/laying quality inspection, roadbed disease inspection | |
400MHz | 2.5ns | 1~4m | 2.5m | Tunnel lining/laying quality inspection, roadbed disease detection, utility detection, Water conservancy and hydropower engineering detection | |
200MHz | 5ns | 1~6m | 4m | Roadbed disease detection, Invert quality inspection, utility detection, Water conservancy and hydropower engineering, Geological survey | |
100MHz | 10ns | 1~30m | 15m | Advance forecast for tunnel geology survey, mineral survey, water conservancy and hydropower engineering detection | |
Non-shield ground-coupling antenna | 35MHz | 2.9ns | 1~40m | 30m | Geology survey, mineral survey, water source research, frozen soil research and ice/snow thickness survey |
Air-coupling horn antenna | 2000MHz | 0.5ns | 0.1~0.5m | 0.3m | Pavement layers thickness detection at highway speed |
1500MHz | 0.7ns | 0.2~0.7m | 0.5m | Pavement layers thickness detection and stabilised layer thickness detection at highway speed | |
Important note: The penetrating depth of the antenna is tightly related to the conductivity of the medium, the higher the conductivity, the shallower the penetration depth of antenna. The penetration depth will drop sharply in wet clay. The above penetrating depth is under absolute condition of theorotical value; | |||||