Jonathan improved the electronic circuit for the tape sensor, adding variable gains (third version, see more on this evolving circuit prototype). This is a huge improvement!
Tibi assembled the 1 in, 3 out all PMMA design, connected it to the electronics and tested it with a mirror to see if there is sign of signal crossing, which is an indication that we can map small deflections in 2D. The screenshot below shows signal crossings for small angle variations of the mirror, placed 1mm away from the tip of the fibers.
A video was also made to demonstrate this prototype. Next step is to assemble everything into a single wire, including the mirror on a lever, and test it on a 1m long beam. In order to optimize the sensitivity we'll keep the gap variable.
The making of this prototype
7 fibers were put together like in this picture
In order to ease the connections with the LED and PS a plastic tube was put over the tip of all fibers. The end results looks like this. The red one is the hot fiber, i.e. the one that brings light into the sensing area. The other 3 black ones are collecting fibers.