Week 6: Midterm Preparations
- Oct 21, 2019
- 2 min read
This past week was dedicated to further preparations for the upcoming Midterm Review. We proceeded to run the system and produce various 3D renderings of different samples. In order to do so, we again traced the system to verify the correct functionality of each stage. While the system ran properly and the code produced the three visualizations, the sample was not being shown. To fix this, we adjusted the distance between the free-space collimators in order to produce interference that is visible on the x-y borders of the slice visualization window. We then adjusted the slice height to coincide with this level. Afterward, we adjusted the field of view via the voltage levels on the two scanners. To our understanding, changing the voltage changes the angle of the mirror. Lastly, to discern where the system was scanning on the probe, we used an Infrared sensor card. With the system running, a red blinking dot can be seen and therefore the sample placement can be adjusted to align with this area. Then, when a piece of the sample was visible on screen, we tuned the knobs on the probe until the sample was properly shown on the screen.
The first sample tested was a printed lowercase letter ‘e’ of approximately 3mm x 3mm. Figure 1 denotes the slice visualization whereas Figure 2 displays the volumetric visualization of the letter. After testing the system with the “e,” we tested other samples available in the lab to practice getting samples of different sizes within view, as seen in Figures 3 and 4.
Our plan for next week is to begin implementing possible solutions for the link bottleneck. We will try to obtain another Ethernet cable, as well as a USB-C cable in order to test for improved link speeds. If neither of these solutions work, then we can narrow down the cause of the limitation to being the oscilloscope, which at that point we may need to connect another oscilloscope or attempt to remedy the current one.
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