Sensornet ORYX DTS, Руководство пользователя

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Page 82 Oryx DTS User Manual v4
If the autoscale ‘padlocks’ are closed, the plot will automatically scale correctly for
new data.
Raw Data Display
This display shows the Stokes and anti-Stokes signals generated by the DTS.
These raw signals are very useful for checking the quality of the fibre optic line and
roughly measuring the losses along the cable and at joins in the fibre. An example
of this display is shown in Figure 64. For a fibre cable at constant temperature along
its length, the signals show the classical exponential signal decay. Also note the
step loss at the zero meter point, this is the connector loss at the DTS output.
Figure 64 - The Raw data display
Cursors can be added to the plot (right-click on the cursor display field & select:
Create Cursor->Free) to measure the approximate loss. Two cursors should be
added (they do not need to be ‘snapped’ to a particular trace) and positioned by
selecting the cursor control button on the graph pallet (Figure 33). In Figure 64
above, the cursors have been positioned at approximately 100m and 2107m. The
loss calculation is performed on the signals at these cursor locations. Although the