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Joint-type transducer

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This project is facilitated by Tactus Scientific Inc. 

The joint-type transducer is an extrinsic optical fiber-based displacement/force transducer. 

Contribution accounting for the Joint-type transducer project


Short-term goals

  • Improve the mirror on the lever part of the joint-type transducer. See Optical fiber coating project.  
  • Fully characterize transducers: sensitivity, stiffness, vibration frequency, thermal effects, mechanical strength, lifetime, etc.  
  • Produce the first scientific data with this transducer.

Long-term goals

  • Build the fiber coating device,  see Optical fiber coating project.  
  • Build a tabletop semi-automated manufacturing device to assemble our transducers. 
  • Design and build or acquire testing and quality control devices as well as calibration devices.


  • Make the first scientific-grade batch of transducers
  • Test the transducers
  • Develop manufacturing capacity  

Who's involved

Tactus (FrancoisIvan), Tibi, Eric, Jonathan, Christopher
[This list will be replaced with a UI/script which will automatically pull info from the activity log, and display members
involved and their relative contribution. See infrastructure activity cluster for more on infrastructure development.]  


Revenue will be generated by selling transducers. Transducers are consumables, they have a finite life-time and they need to be replaced from time to time. Transducers are used in the Mosquito, and other systems that integrate the Mosquito. 
  • All members involved in design and prototyping of the transducer will be compensated from the income generated by sales, in proportion to their involvement. Any future improvement of the joint-type transducer will be accounted for.
  • Members taking part in designing and building the semi-automated manufacturing device to assemble our transducers will also have a cut from the revenue generated by every transducer sold. 
  • Members involved in the manufacturing process will get compensated a certain parentage, for every batch of transducers sold.    
See SENSORICA Business Model and Contribution Accounting System.

Tools, activities, and processes

Skills and resources needed

Optics, opto-mechanical assemblies, mechanical engineering. 

Contact us if you want to contribute!

Joint-type transducer


  • PDMS-based joint for PMMA fiber
    Posted Apr 18, 2014, 3:42 PM by Tiberius Brastaviceanu
  • Testing of the convex delivery exit with flat mirror joint-type transducer 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 ...
    Posted Apr 7, 2013, 5:49 PM by Tiberius Brastaviceanu
  • Transducer fabrication device 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 
    Posted Jul 17, 2012, 8:06 PM by Tiberius Brastaviceanu
  • Previous news 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 ...
    Posted Mar 7, 2012, 9:13 PM by Tiberius Brastaviceanu
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Optical designs

PMMA fiber joint type transducer

Testing the new mosquito with a joint-type transducer