Velocity
E-7 ElektroPhysik
Note: during calibration, ensure the clean of the probe surface
because the attached coupling agents and other dirt will influence the
calibration accuracy. When the measuring temperature changes greatly,
it is recommended to use this function to make sure the measurement is
accuracy.
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6.3.2
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Velocity measurement
Because the work-piece is made from various materials and even the same
material with different content and processing technology, the sound
velocity will changed and this change will cause the measuring error. If
the error is not enough to influence the measuring accuracy, it can be
neglect, otherwise it is necessary to get the accurate sound velocity of the
work-piece to be measured. The velocity measurement can be used, the
usage is as follows:
1.
Select or preset the sound velocity almost that of the material.
2.
Select an measured sample whose thickness is nearly the same as the
work-piece to be measured and measure the actual thickness by other
measuring methods.
3.
Use the instrument to measure the samples and get a thickness value.
4.
Adjust the sound velocity and make the measured thickness value is
almost or the same with that of the samples.
5.
Re-measure the sample's thickness and recheck the deviation
between the measured value and the actual value. If the two values are the
same, that sound velocity is the accurate value of the materials.
