Sensors & Software LMX200 Series, Руководство пользователя

Страница: 56 / 133

Line Scan
56
As the Line Scan data scrolls on the screen, the DynaQ Index Bar is displayed along the bottom
of the screen (Figure 6-4). The color of the bar indicates the quality of the data at that point
along the line:
White = No Data (too fast!)
Yellow = Moderate quality
Light blue = Better quality
Dark Blue = Highest quality
In general, avoid collecting data at extremely high speeds.
6.4 Back-up Indicator
Line Scan mode incorporates a back-up feature to enable you to accurately locate targets and
mark them on the ground. After acquiring some data on the screen, move the system backwards
(Figure 6-5a). During back-up mode, there will be two indicators:
•
Position Indicator : The red vertical line corresponds to the location at the center of
the GPR sensor. As you pull the cart backwards, the Position Indicator moves to
mark the current location of the cart in the image and a box appears with the current
position, relative to the start of the line, listed as the top number.
Figure 6-5: a) Back-up Indicator, b) Moving the Depth Indicator to the top of the hyperbola
•
Depth Indicator : A short red horizontal line corresponds to the current depth value,
as shown in the bottom number in the box. To determine the depth of an object,
move the indicator up or down by dragging the horizontal line to the desired location
(Figure 6-5b). Alternatively, you can also use the
Up and Down arrows on the 4-way
directional keypad. Note: make sure you have done a Soil Cal to ensure depth
accuracy (
Section 6.7.6).
To locate a feature, simply roll the system back along the same path until the red vertical line is
exactly over the response (usually a hyperbola). You can mark the location of the object on the