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Authenticity testing for an unknown speed of sound:
There are several situations in which the speed of sound oft the test object is not precisely
known. Some ingots are made of alloys or of uncommon materials whose speeds of sound are
not included in our table and whose values on the Internet sometimes differ considerably. In
such cases, we recommend the following procedure.
Display
Procedure
Determining the speed of sound:
To determine the speed of sound of the bar,
select a spot (e.g., on the outer edge of the
ingot) where the material is not pierced by a
foreign metal inclusion (foreign metal rods are
usually inserted centrally). Apply a sufficient
amount of ultrasound gel onto the spot you
want to measure and place the measuring
head. During the measurement, it does not
matter which speed of sound is selected. Not,
however, that the selected speed of sound will
be overwritten.
Please note: When following this procedure,
experience is important for interpreting the
results. In addition, other properties, such as
the density of the ingot, should be carefully
checked.
Measuring the thickness:
After the measurement, the device displays a
value for the thickness of the bar. This value
for the thickness is incorrect because also the
previously selected speed of sound was
incorrect. Therefore, determine the correct
thickness of the ingot with a caliper.
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