ground penetrating radar (gpr)

GROUND PENETRATING RADAR (GPR)

• GPR is an electromagnetic method that detects interfaces between subsurface materials with differing dielectric constants

• The transmitter radiates repetitive short-duration electromagnetic signals into the earth as the antenna moves across the surface.

• Electromagnetic waves are reflected back to the receiver by interfaces between materials with differing electrical properties


trace


Subsurface features, which may cause such reflections, are for instance: Man-made objects including all types of utilities

of various material types such as plastic, ductile iron, concrete, underground storage tanks, building foundations, trench boundaries, buried waste and more.

Natural geologic conditions such as changes in soil composition, supporting layers, ice, groundwater level, bedrock, boulders, cobbles, voids etc.


Approximate depth range for different antenna frequencies

GROUND PENETRATING RADAR (GPR)Comparison of 3 different antenna frequencies


Types of Antennas

GROUND PENETRATING RADAR (GPR)Unshielded antennas & suitable areas of use

GROUND PENETRATING RADAR (GPR)Unshielded antennas

The unshielded antennas consist of separate transmitter and receiver electronics to which the antenna elements are attached


Electronic unit 200 MHz

100 MHz

50 MHz

25 MHz

200 MHz

GROUND PENETRATING RADAR (GPR)Unshielded antennas - Rough Terrain Antenna

(RTA)

GROUND PENETRATING RADAR (GPR)Shielded antennas & suitable areas of use

GROUND PENETRATING RADAR (GPR)Shielded antennas

100 MHz 250 MHz

500 MHz 800 MHz

Electronic unit

Electronic unit with battery mountedCable hose

GROUND PENETRATING RADAR (GPR)Rough Terrain Cart (RTC)


Monitor


Radargram screen Main menus

Battery indicator status

Information line

Control unit indicator

GROUND PENETRATING RADAR (GPR)Measurement settings

GROUND PENETRATING RADAR (GPR)Measurement settings

Zero level is expressed in nanoseconds as the location of the ground surface; from where the depth scale begins.

GROUND PENETRATING RADAR (GPR)ProEx Control Unit


ProEx Control Unit mounted on RTC


ProEx Control Unit and the safety hook


Wheels for measuring distance

ground penetrating radar (gpr)

Documents

ground surface

antenna elements

electromagnetic method

electromagnetic waves

subsurface materials

electronic unitelectronic

separate transmitter

receiver electronics