Conquest
5-Line Scans and Grid Scans
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In Line Scan mode the objectives are:
a) to confirm if the system is “seeing” into the concrete;
b) to obtain a sense of the site structure;
c) to assess the orientation of the rebar mats;
d) to get an idea of the depth of exploration.
In Line Scan mode you should identify the feature’s alignments. The purpose is to select the
optimum orientation for positioning the survey grid mat for imaging.
Simple Line Scans don’t always provide a good sense of the spatial distribution of the features in
complex sites. Grid Scans permit you to create images to clearly define where objects are in
relation to one another, allowing for more efficient planning of cutting and drilling sites.
5.3
Step 3: Place grid mat
Use Line Scan to determine the optimum orientation for grids. For the best resolution of targets,
the survey grid should be aligned perpendicular to any embedded objects in the concrete. If there
are features which run at oblique angles, you should select the predominant orientation for
aligning the grid.
When positioning the grid mat, you should pick a reference point and then place the grid mat
registration point on that mark. The best way to do that is to put a chalk mark or pin or other
indicator on the surface and then place the transparent grid mat over top of it. This reference
point should be such that you can go back to the site after you have removed the grid mat.
The transparent grid mat should be taped on to the structure with duct tape. During grid scan
collection, the Conquest sensor will be moved along the survey guide lines on the mat grid to
acquire the data.
Conquest comes with a standard 24” x 24” grid mats or the metric equivalent of 600mm x
600mm. This is the usual survey size for local area investigations. Larger areas can be surveyed
by taping multiple grid mats together to produce 24” x 48” grid (600mm x 1200mm), 48” x 48”
(1200mm x 1200mm) or 24” x 96” (600mm x 2400mm) grids. The 96” x 96” grid (2400mm x
2400mm) grids can also be done but the user must measure and mark this grid out.
Details on setting the parameters for Grid Scans are described in
Help > Grid Scan > Define
Parameters
.
On the Conquest transparent sheet grids, the line numbers which go on beyond the edge of the
first grid are indicated on the sheets in brackets. When joining multiple sheets, make the sheets
overlap them such that the sheet edges won’t catch the bottom of the sensor (see Figure 5-2)
Summary of Contents for Conquest Series
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Page 12: ...Table of Contents Conquest iv ...
Page 14: ...1 Overview Conquest 2 ...
Page 20: ...3 Packing Up Conquest Conquest 8 ...
Page 32: ...4 Principles of Operation Conquest 20 ...
Page 42: ...5 Line Scans and Grid Scans Conquest 30 ...
Page 44: ...6 Help Conquest 32 ...
Page 58: ...10 Care and Maintenance Conquest 46 ...
Page 69: ...Appendix C Instrument Compatibility Conquest C 2 ...
Page 71: ...Appendix D Safety Around Explosive Devices Conquest D 2 ...
