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Proceedings Paper

An optical fiber Bragg grating tactile sensor
Author(s): Barbara Cowie; Thomas Allsop; John Williams; David Webb; Ian Bennion; Matthew Fisher
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Paper Abstract

Tactile sensors are needed for many emerging robotic and telepresence applications such as keyhole surgery and robot operation in unstructured environments. We have proposed and demonstrated a tactile sensor consisting of a fibre Bragg grating embedded in a polymer "finger". When the sensor is placed in contact with a surface and translated tangentially across it measurements on the changes in the reflectivity spectrum of the grating provide a measurement of the spatial distribution of forces perpendicular to the surface and thus, through the elasticity of the polymer material, to the surface roughness. Using a sensor fabricated from a Poly Siloxane polymer (Methyl Vinyl Silicone rubber) spherical cap 50 mm in diameter, 6 mm deep with an embedded 10 mm long Bragg grating we have characterised the first and second moment of the grating spectral response when scanned across triangular and semicircular periodic structures both with a modulation depth of 1 mm and a period of 2 mm. The results clearly distinguish the periodicity of the surface structure and the differences between the two different surface profiles. For the triangular structure a central wavelength modulation of 4 pm is observed and includes a fourth harmonic component, the spectral width is modulated by 25 pm. Although crude in comparison to human senses these results clearly shown the potential of such a sensor for tactile imaging and we expect that with further development in optimising both the grating and polymer "finger" properties a much increased sensitivity and spatial resolution is achievable.

Paper Details

Date Published: 16 May 2007
PDF: 8 pages
Proc. SPIE 6585, Optical Sensing Technology and Applications, 65850I (16 May 2007); doi: 10.1117/12.723843
Show Author Affiliations
Barbara Cowie, Aston Univ. (United Kingdom)
Thomas Allsop, Aston Univ. (United Kingdom)
John Williams, Aston Univ. (United Kingdom)
David Webb, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)
Matthew Fisher, Aerovac Systems Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 6585:
Optical Sensing Technology and Applications
Francesco Baldini; Jiri Homola; Robert A. Lieberman; Miroslav Miler, Editor(s)

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