5.12 Changing probe
The wear of the probe’s interlayer plate will influence the measurement.
Please replace probe when the following situation happens.
1. When measuring different thickness, it always displays the same
value.
2. When plugging the probe, it has echo indication or measured value
display without measuring.
5.13 Measuring casting
It has specialty for measuring casting. The crystal particles for castings are
coarse, the structures are not dense enough, plus that they are in gross
state, which makes difficulty in measuring their thickness.
First of all, due to coarse crystal particles and not-so-dense structure, it
will cause large attenuation in sound energy. The attenuation is due to
material’s scatter and absorption of sound energy. The attenuation
degree is closely relative with the size of crystal particle and ultrasonic
frequency. Under the same frequency, the attenuation will increase with
the crystal diameter, but it has a high limit, when it reaches to this limit, if
the crystal diameter increases, the attenuation will tend to be a fixed
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