Tibi tested a different fiber arrangement for the tape sensor for its mechanical integrity. Six 1mm diameter PMMA fibers are placed around a center fiber of the same type. The structure is stable and the 6 outer fibers are distributed almost uniformly around the center one. The center fiber brings light into the sensing region. A mirror reflects the light back. 3 out of these 6 outer fibers collect the light and carry it back to 3 detectors. This is one design among others, described in this document.
Picture showing the 7 fiber assembly
At the same time, Tibi finished and tested the LabView program that can accept and process multiple inputs. More about the electronics made by Jonathan here. For the proof-of-concept, all calculations on input signals will be performed digitally. The application will be slower, but this technique is a lot faster. Once we'll learn more about the relation between all input signals, to map input signal variation into 2D spatial information, and if this application takes off, we'll think about a way to do that on hardware, or even use a DSP. Bill and Jonathan are working on the mathematical model for this type of sensor.
We successfully tested a 3 fiber device made by Jonathan - 1 fiber input and 2 output, which is a uni-dimensional but directional sensor. You can see the demonstration recorded during our meeting today.
Francois is also making progress with optical fiber coating and we'll use these new techniques to make a custom-designed mirror for this device.
Francois working on fiber coating at SENSORICA lab in Montreal