Problems...
We wanted to add the measurement of sample thickness to the list of tasks in our exercise, but there are some difficulties with interpretation of data obtained from detector. For different probes and sample there are observable some unexpected echoes. They occur behind the echo from the bottom of the sample, so it's really confusing for us. We tried to figure out why they appear, but this problem is still unsolved.
We wanted to add the measurement of sample thickness to the list of tasks in our exercise, but there are some difficulties with interpretation of data obtained from detector. For different probes and sample there are observable some unexpected echoes. They occur behind the echo from the bottom of the sample, so it's really confusing for us. We tried to figure out why they appear, but this problem is still unsolved.
Despite the facts described above, we confirmed the good correlation between sample thickness measured with caliper and ultrasonic detector (aluminium samples, normal probes, results based on bottom's echo and it's multiplicity). The plans for next week present as follows:
- considering the origin of 'strange' echos
- testing USG gel as the couplant (in compartion with water)
- measurements of attenuation factor (we need to prepare the external scale to determine the height of echoes because the original software has no this option)
Furthermore, we are invited for consultation with one of academic teachers, who will give us some advices and show samples with intentionally introduced flaws (it's possible to copy them in workshop).
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