User's Manual

Smart Systems User’s Manual Version 1.1

5.4 Noggin Data Acquisition

Data acquisition is done simply by pushing the Smart Cart or Smart Handle system

along the survey line. This is usually done with the odometer active, however, it is

possible to turn off the odometer and run the Smart System in continuous operation (see

Section 5.5.1 – Odometer Active).

During data acquisition, the settings for Depth (Section 5.3.5) and Gain (Section 5.3.6)

can be changed by pressing the corresponding button until the desired setting appears.

This can be done while the instrument is collecting data; there is no need to stop first.

5.4.1 Collecting Data using the Odometer

As the Smart System moves, the odometer triggers the system to collect a data trace at

fixed distance intervals. This interval is called the “station interval”. For the Noggin 250,

the normal station interval is 5 centimeters (about 2 inches). For the Noggin 500, the

normal station interval is 2.5 centimeters (about 1 inch). For the Noggin 1000, the normal

station interval is 1.0 centimeter (about 0.48 inch). The station interval can be changed

in the Setup (see Section 5.5.1 – Station Interval).

Each data trace is plotted as a vertical strip on the screen (see Figure 5-1).

For the Noggin 250, each trace is 2 pixels wide. Since the screen is 640 pixels wide,

each screen has 320 traces. When the station interval is set to Normal, each screen

displays 16.0 metres (51.2 feet) of data for the Noggin 250.

For the Noggin 500, each trace is 1 pixel wide. Since the screen is 640 pixels wide,

each screen has 640 traces. When the station interval is set to Normal, each screen

displays 16.0 metres (51.2 feet) of data for the Noggin 500.

For the Noggin 1000, each trace is 1 pixel wide. Since the screen is 640 pixels wide,

each screen has 640 traces. When the station interval is set to Normal, each screen

displays 6.4 metres (25.6 feet) of data for the Noggin 1000.

The maximum number of screens (or buffers) that can be saved on the Digital Video

Logger is 250. This gives a total survey distance of 4000 metres (2.4 miles) for both the

Noggin 250 and Noggin 500. For the Noggin 1000, the total survey distance in 250

screens is 1600 metres (1.2 miles). For more details on total distances and Station

Intervals see Section 5.5.1 – Station Interval.

The odometer units that appear across the top of the screen can be set to either metres

or feet (see Section 5.5.1 – Units).

Smart Systems can normally collect data at a very fast walking pace. However, if the

system is moved too quickly, data quality is reduced (see below).

During data acquisition, the current odometer position value (in the current units, either

metres or feet) is written to the lower right corner of the screen.