Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 4 - Uncontrolled Evaluation Reports (2013) / Chapter Skim
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1System Description This chapter was prepared by 3d-Radar and describes how the 3d-Radar system was improved for the field evaluation in Task 7. Figure 1.1 shows the improved system assembled behind a pickup truck before the uncontrolled field evaluation in Florida.
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2real-time processing and postprocessing The real-time processing sequence consists of • Inverse Fast Fourier Transform (including frequency filter) ; • Background subtraction; • Time windowing; and • Range gain compensation.
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3 values takes care of the varying amplitudes of signatures due to delamination. Schematically, the time window of interest is extracted from every trace and converted to frequency domain, where the spectrum is divided into frequency intervals, or "bins." The algorithm computes the energy contained in every bin and then sorts the obtained values.
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4to divide the data into smaller portions, an operation now performed manually by the user. The delamination detection algorithm has given reasonably good results for some of the data collected and lacked consistency for others.
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