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Announcements - joint-type transducer

PDMS-based joint for PMMA fiber

posted Apr 18, 2014, 3:42 PM by Tiberius Brastaviceanu   [ updated Apr 18, 2014, 3:42 PM ]


PMMA joint-type transducer for LED Mosquito - Christopher


Testing of the convex delivery exit with flat mirror joint-type transducer

posted Apr 7, 2013, 5:39 PM by Tiberius Brastaviceanu   [ updated Apr 7, 2013, 5:49 PM ]

Today, Tibi created a setup to test the convex delivery exit with flat mirror joint-type transducer. A 1550nm Mosquito (with Chinese parts: LD+isolator, PD and a 50/50 Y coupler in between them) was used, in conjunction with the LabJack. The Chinese laser with isolator was driven by Frederic's laser driver. The delivery fiber tip was rounded using the fiber splicer. Two reusable ST connectors were used to connect a piece of fiber with a rounded tip with the Mosquito. A "perfect" mirror (silver, surface coated) mounted on a gimbal was used to simulate the joint-type transducer. 

Before testing this device, a flat fiber was put in front of the mirror. The Mosquito signal showed large fluctuations due to resonance within the cavity. 

The flat fiber was replaced with a rounded tip fiber and the same test was performed, showing a great reduction in fluctuations. 

Unfortunately, the laser or Frederic's laser driver started to act funny, and no quantitative data was extracted. In conclusion, the rounded tip of the delivery fiber reduces signal fluctuations. 

What is the nature of these signal fluctuations? Is this a Fabry Perot effect, sending more or less light to the detector based on the conditions of the cavity? Are these fluctuations related to the laser, as it get's more or less feedback? are they a combination of those? 

This post will be continued...

Transducer fabrication device

posted Jul 17, 2012, 8:05 PM by Tiberius Brastaviceanu   [ updated Jul 17, 2012, 8:06 PM ]

Work is being done on the joint-type transducer fabrication device. Tibi, Ivan and Daniel are collaborating on this. We are still working on a prototype device, to learn what we need and how materials behave, before moving to build a more robust system. 

Pictures of the prototype will be dropped in this Album


See also the 3D modeling under way 

Previous news

posted Mar 7, 2012, 9:13 PM by Tiberius Brastaviceanu   [ updated Mar 7, 2012, 9:13 PM ]

  • We successfully tested the second version of the joint-type transducer (open Work Party doc). We are now planning another iteration to improve it, using a silver coated fiber (see Wet silver coating project).
  • We are working on the second version of the joint-type transducer fabrication device (members only).  
  • We are installing a Mosquito Scientific Instrument at Royal Victoria hospital (McGil University, Montreal, Canada) to fully characterize the joint-type transducer and to optimize it. See Sabah's project.
  • We are preparing an installation at Montreal Institute of Cardiology (affiliated with Universite de Montreal, Montreal, Canada) to fully characterize the joint-type transducer and to optimize it. See Philippe's project.
  • We are developing our relation with Optech for foll characterization of the joint-type transducer under controlled environmental conditions. 

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