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Progress in 3 areas

posted Feb 27, 2013, 9:10 PM by Tiberius Brastaviceanu   [ updated Feb 28, 2013, 10:53 AM ]

PMMA fiber constriction

Today, Joel continued the work on the PMMA fiber constriction device. He completed and tested the oven containing an omega-shaped nikel-chromium alloy wire. Previously, Joel wrote the manual for the REX C100 PID temperature controller, which will be used to set up the temperature profiles around the PMMA fiber. See Joel's main document for this project.
The next step is to build holders for the fiber, a mechanism to put the fiber under tension, and a switching mechanism to start heating and to stop heating when the fiber is pulled to a given length. Tibi supervised the work, Jonathan was informed about the electronics needed.

PMMA constriction fabrication device made by Joel

Tape sensor characterization and optimization

Enrique used the setup made by Tibi to characterize and optimize the tape transducer and recorded the first comprehensive data.
The main goal of this experiment was to find the optimal size of the gap (distance between the mirror and the fibers).
The one in 3 out prototype with round glass fiber tip was used. The setup consisted of a green laser coupled to the 125/62.5 MM glass fiber (the in fiber) using a lens. The fiber was hold in place using the reusable ST connector. The
one in 3 out prototype (fiber assembly) was prepared by Tibi before the experiment: PMMA fibers were polished and the glass fiber tip was cleaned with alcohol. The tip of the fiber on the side of laser was freshly cleaved. 

Setup used during this experiment
Setup built by Tibi and Enrique for calibration and characterization.

Acquiring data
Program made by Tibi and used by Enrique for characterization and optimization.

Preliminary data obtained

Chart 4

We are looking for a linear relation between angle (mirror tilt) and gap size. The preliminary data shows that being too far from, or too close to the mirror is not good. There is a sweet spot somewhere in the middle. Open the spreadsheet used for characterization and optimization of the tape transducer. Next week we'll continue exploring this same prototype and evaluate its sensitivity. Tibi needs to modify the LabView program in order to allow faster acquisition and better statistics.

PMMA fiber grooving

Jonathan advised Kevin to designed a new fiber grooving device. He brainstormed with Tibi and Enrique and came up with a brilliant 3D model. Next step is to perfect this design and build a prototype.