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Table 1 Composition of the test pieces.

From: Geometrical Feature Extraction from Ultrasonic Time Frequency Responses: An Application to Nondestructive Testing of Materials

Test piece Agar-Agar concentration of scatterers mean
1 and 2 2% in distilled water 1000 molecular sieves 0.5 mm
3 and 4 2% in distilled water 1000 molecular sieves 0.7 mm
5 and 6 2% in distilled water 1000 molecular sieves 1.3 mm
7 and 8 2% in distilled water 1000 molecular sieves 1.8 mm