46
en
calibrated for mild steel pipe and measures through both materials, the actual coating thickness will appear
to be 2.5 times thicker than it actually is, as a result of the differences in sound-velocity.
The error can be eliminated by using the echo-echo mode to perform measurements for applications such
as these. In echo-echo mode, the paint/coating thickness will be eliminated entirely and the steel will be the
only material measured.
19 SOUND VELOCITIES OF COMMON MATERIALS
Material
Sound
velocity (m/s)
Sound
velocity (in/µs)
Material
Sound
velocity (m/s)
Sound
velocity (in/µs)
Aluminium 6350 0.250 Paraffin 2210 0.087
Bismuth 2184 0.086 Platinum 3962 0.156
Brass 4394 0.173 Plexiglas 2692 0.106
Cadmium 2769 0.109 Polystyrene 2337 0.092
Cast Iron 4572 0.180 (Approx.) Porcelain 5842 0.230 (Approx.)
Constantan 5232 0.206 PVC 2388 0.094
Copper 4674 0.184 Quartz Glass 5639 0.222
Epoxy Resin 2540 0.100 (Approx.) Rubber, Vulcanised 2311 0.091
German Silver 4750 0.187 Silver 3607 0.142
Glass, Crown 5664 0.223 Steel 5918 0.233
Glass, Flint 4267 0.168 Steel, Stainless 5664 0.223
Gold 3251 0.128 Stellite 6985 0.275 (Approx.)
Ice 3988 0.157 Teflon 1422 0.056
CG60_CG60DL_TMA_0498_00_01_23225_A6L.fm Page 46 Tuesday, November 22, 2011 12:19 PM
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