Home‎ > ‎What We Do‎ > ‎Projects‎ > ‎*Dormant projects‎ > ‎Mosquito Project‎ > ‎Constriction transducer‎ > ‎

Announcements - constriction transducer

Glass fiber constriction studies using the LED 850nm Mosquito

posted May 10, 2013, 5:12 PM by Tiberius Brastaviceanu   [ updated May 10, 2013, 5:14 PM ]

Open to edit

Constriction transducer from PMMA fiber

posted Apr 11, 2013, 1:16 PM by Tiberius Brastaviceanu   [ updated Apr 11, 2013, 1:16 PM ]

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

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.


Constriction transducers reach the sensitivity of the joint-type

posted Mar 28, 2013, 2:20 AM by Tiberius Brastaviceanu   [ updated Oct 24, 2013, 10:10 AM ]

Last week Tibi made a few constriction transducers using the fiber splicer, which are as sensitive as the joint-type. Two of them were brought to Phil's lab, and one was tested with Phil's Mosquito. They are made from 125/62.5 MM glass fiber, they have 4 constriction zones, and the tip is coated with silver using our own coating method

We asked Hang to model the constriction transducer in order to optimize it. 

A device for constriction fabrication

posted Sep 13, 2012, 7:42 AM by Tiberius Brastaviceanu   [ updated Sep 13, 2012, 7:46 AM ]

Tibi and Jonathan are modifying an old optical fiber splicer to fabricate the constriction transducer. The idea is to use a platinum filament to locally heat the glass fiber very close to the melting point and pull it a few microns to create a constriction. Yassine might help with automation. More info to come.  [need a very simple 3D model, need pictures of the omega-shaped filament]. 

old fiber splicer modified for transducer fabrication

old fiber splicer modified for transducer fabrication, the action zone

Work party

posted Mar 26, 2012, 9:14 PM by Tiberius Brastaviceanu   [ updated Mar 26, 2012, 9:14 PM ]

During the last work party on Mars 07, 2012, we discovered that we needed to use a platinum alloy as heating element. We acquired a sample to test and it actually worked A LOT BETTER than other heating elements we tested during the previous trial. Although we did not succeed in manufacturing a constriction transducer, we advanced this project quite a bit. We also improved our setup by using some optical fiber alignment tools we manufactured from a thermoplastic polymer.  See pictures taken documenting this Work. Open experimental report.   

Glass optical fiber going through platinum alloy heating element 

Work Party

posted Mar 7, 2012, 7:45 PM by Tiberius Brastaviceanu   [ updated Mar 26, 2012, 9:19 PM ]

We tried two types of heating elements, tungsten and chrome-nickel. Both wires form crystals when they are heated and end up burning before the glass fiber softens enough to be pulled. 

Open report : 2012 07 March Work Party - constriction transducer Tibi and Jonathan
We discovered this new possibility at the beginning of March 2012. See the source of inspiration.  

glass optical fiber going through tungsten coil 

1-6 of 6