Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 23, Issue 12, Pages 771-773Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2011.2134844
Keywords
Flexible; optical; shear sensing; tactile sensing
Funding
- Institute for the Promotion of Innovation by Science and Technology (IWT), Flanders, Belgium
- EU
- Research Foundation-Flanders (FWO-Vlaanderen)
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Tactile shear stresses play an important role in the medical field and robotics. To monitor these stresses in situ, there is a need for unobtrusive flexible sensors that can be wrapped around curved surfaces or moving body parts. The presented sensor is based on changing coupling of optical power between a vertical-cavity surface-emitting laser (VCSEL) and a photodiode facing each other and separated by a deformable transducer layer. The required optoelectronic components were embedded in a polymer foil of only 40 mu m thick, yielding a very thin and flexible total sensor stack of 250 mu m thick. In the linear part of the range (between 2 and 5.5N), the sensitivity of the prototype was -350 mu A/N; the maximum measurable force was 5.5 N. However, by selecting the appropriate deformable sensor transducer material, the sensitivity and range can be tuned for a specific application.
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