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GSSI SIR .

CONTENTS:

GEOPHYSICAL SURVEY SYSTEMS INC.

SIR (Subsurface Interface Radar) SYSTEMS

SIR SYSTEM 2

SIR SYSTEM APPLICATIONS

SIR SYSTEM DETECTION CAPABILITIES

GPR (Ground Penetrating Radar) CONCEPT

HOW A SIR SYSTEM WORKS

GPR RECEIVED SIGNAL AND GRAPHIC PROFILE DISPLAY

ANATOMY OF RADAR RECORD

FOUR TYPES OF DATA DISPLAYS

EFFECT OF ELEVATION CHANGES ON GPR DATA

TWO ELECTRICAL PROPERTIES OF IMPORTANCE TO GPR WORK

ELECTRICAL CONDUCTIVITY

Conductivity of unsaturated soils and sediments

Conductivity variation as a function of porosity in sediments

Effect of water content on electrical conductivity

General divisions of materials by electrical conductivity

APPROXIMATE VALUES OF S AND Er FOR VARIETY OF MATERIALS

GPR PENETRATION

RELATIVE DIELECTRIC PERMITTIVITY

Dielectric constant of unsaturated soils and sediments

Dielectric constant variation as a function of porosity in sediments

Effect of water content on dielectric constant

Dielectric constants of some common materials

REFLECTION STRENGTH

Predicted reflection sterngths

Reflection coefficients for a simple two-layer case

CONDUCTING A SURVEY

Target characteristics

Survey design

GPR survey configurations

Two factors influencing antenna selection

GPR ANTENNA CHARACTERISTICS DEFINITIONS

Spectrum for 120 MHz antenna

Radiation pattern for GSSI antennas

Measured radiation pattern for GSSI 500 MHz antenna

GPR DEPTH OF INVESTIGATION

Normal investigation depths of GSSI antennas

Best GSSI antennas to use for a given depth range of investigation

Example depths of GPR in some soils and rocks

Variation of the depth of investigation with antenna frequency

ESTIMATED VERTICAL RESOLUTION

Minimum thickness layer that can be resolved

Detecting buried objects

HORIZONTAL RESOLUTION

First fresnel zone radius

SIR SYSTEM SETUP

SIR modes of operation

Seting the initial range

Range differences

Understanding Sample/Scan

Understanding Scans/Second

Setting Scans/Second when using the survey wheel

Determining your maximum velocity

Setting the gains

Choosing the color scale and color transform

Color transform

SIR FILTERS

Vertical high pass filter

Vertical low pass filter

Horizontal background removal filter

ESTIMATING DEPTHS FROM GPR DATA

Estimating velocity from the dielectric constant

Approximate electromagnetic properties of various materials

Locating object of cnown depth

Hyperbola estimation method

Simple CDP

SURVEY TIPS

MORE SURVEY TIPS

CONDITIONS NECESSARY FOR GOOD GPR SURVEY RESULTS

 
 
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