SIGNAL™ is a user-friendly software which is used to inspect
the quality of the data collected from the SST which was
developed during the Strategic Highway Research Program and
further developed during the SUPERPAVE implementation.
Two options are currently provided for file type – those
collected by the Interlaken and the Cox (ATS files)
devices. The user should set the type of file before
browsing the directories for the data files.
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Signal File System
The SIGNAL software uses a file system in which all data
files are located in tempXXX directories under a project
directory. Each of the tempXXX locations is indented for
files tested at different temperatures. In the example
below the project is “Lamont” for which data is present
for various temperatures (-10, 0, 10, 20 and 30 C
Raw data signals
The data from a test can be inspected as sine waves or
as stress versus strain (energy). Typical examples of
these plots are given below. Data points can be turned
on and off and in addition, a smooth line conforming
to a sine wave can be shown to give an indication of
the signal quality.
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The data can be shown as frequency isotherms by checking
the Frequency radio button. To display the data for
multiple files click on the blue circle adjacent to each
file name. The results will bedisplayed, as the circle
becomes fill. The data can be expressed in two formats,
G’ and G” or G* and phase angle as illustrated below.