Color-Coded Fiber-Optic Tactile Sensor for an Elastomeric Robot Skin

The sense of touch is essential for reliable mapping between the environment and a robot which interacts physically with objects. Presumably, an artificial tactile skin would facilitate safe interaction of the robots with the environment. In this work, we present our color-coded tactile sensor, incorporating plastic optical fibers (POF), transparent silicone rubber and an off-the-shelf color camera. Processing electronics are placed away from the sensing surface to make the sensor robust to harsh environments. Contact localization is possible thanks to the lower number of light sources compared to the number of camera POFs. Classical machine learning techniques and a hierarchical classification scheme were used for contact localization. Specifically, we generated the mapping from stimulation to sensation of a robotic perception system using our sensor. We achieved a force sensing range up to 18 N with the force resolution of around 3.6 N and the spatial resolution of 8 mm. The color-coded tactile sensor is suitable for tactile exploration and might enable further innovations in robust tactile sensing.

[1]  B. Gates.  A robot in every home. , 2007, Scientific American.

[2]  Andrea Cherubini,et al.  In Pursuit of Safety: An Open-Source Library for Physical Human-Robot Interaction , 2018, IEEE Robotics & Automation Magazine.

[3]  Nathan F. Lepora,et al.  Dual-Modal Tactile Perception and Exploration , 2018, IEEE Robotics and Automation Letters.

[4]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[5]  Warren S. Grundfest,et al.  Optimization of a Pneumatic Balloon Tactile Display for Robot-Assisted Surgery Based on Human Perception , 2008, IEEE Transactions on Biomedical Engineering.

[6]  S. Kawakami,et al.  Change of the refractive index in an optical fiber due to external forces. , 1978, Applied optics.

[7]  Kamila Gawel,et al.  Responsive Hydrogels for Label-Free Signal Transduction within Biosensors , 2010, Sensors.

[8]  Frank Kirchner,et al.  Integration of Fiber-Optic Sensor Arrays into a Multi-Modal Tactile Sensor Processing System for Robotic End-Effectors , 2014, Sensors.

[9]  Jonathan Rossiter,et al.  The TacTip Family: Soft Optical Tactile Sensors with 3D-Printed Biomimetic Morphologies , 2018, Soft robotics.

[10]  Edward H. Adelson,et al.  GelSight: High-Resolution Robot Tactile Sensors for Estimating Geometry and Force , 2017, Sensors.

[11]  Olzhas Adiyatov,et al.  A Series Elastic Tactile Sensing Array for Tactile Exploration of Deformable and Rigid Objects , 2018, 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

[12]  Vincent Hayward,et al.  The brain uses extrasomatic information to estimate limb displacement , 2015, Proceedings of the Royal Society B: Biological Sciences.

[13]  Oussama Khatib,et al.  The Ocean One hands: An adaptive design for robust marine manipulation , 2017, Int. J. Robotics Res..

[14]  Nathan F. Lepora,et al.  Slip Detection With a Biomimetic Tactile Sensor , 2018, IEEE Robotics and Automation Letters.

[15]  Nikolaus Correll,et al.  Integrated proximity, contact and force sensing using elastomer-embedded commodity proximity sensors , 2018, Auton. Robots.

[16]  Kaspar Althoefer,et al.  Magnetic Resonance-Compatible Tactile Force Sensor Using Fiber Optics and Vision Sensor , 2014, IEEE Sensors Journal.

[17]  Frank Kirchner,et al.  Towards a fine-manipulation system with tactile feedback for deep-sea environments , 2015, Robotics Auton. Syst..

[18]  Mary C. Boyce,et al.  Durometer Hardness and the Stress-Strain Behavior of Elastomeric Materials , 2003 .

[19]  Guocheng Shao,et al.  new fabrication method for all-PDMS waveguides , 2013 .

[20]  Koichiro Deguchi,et al.  Precise Shape Reconstruction by Active Pattern in Total-Internal-Reflection-Based Tactile Sensor , 2014, IEEE Transactions on Haptics.

[21]  Ravinder Dahiya,et al.  Robotic Tactile Perception of Object Properties: A Review , 2017, ArXiv.

[22]  Naoki Kawakami,et al.  Finger-Shaped GelForce: Sensor for Measuring Surface Traction Fields for Robotic Hand , 2010, IEEE Transactions on Haptics.

[23]  Hirofumi Suzuki,et al.  Object exploration and manipulation using a robotic finger equipped with an optical three-axis tactile sensor , 2009, Robotica.

[24]  Connor Schenck,et al.  Perceiving and reasoning about liquids using fully convolutional networks , 2017, Int. J. Robotics Res..

[25]  Anthony G. Cohn,et al.  ViTac: Feature Sharing Between Vision and Tactile Sensing for Cloth Texture Recognition , 2018, 2018 IEEE International Conference on Robotics and Automation (ICRA).

[26]  Véronique Perdereau,et al.  Tactile sensing in dexterous robot hands - Review , 2015, Robotics Auton. Syst..

[27]  Mathias Kolle,et al.  Stretchable Optomechanical Fiber Sensors for Pressure Determination in Compressive Medical Textiles , 2018, Advanced healthcare materials.

[28]  Salvador Sales,et al.  Low Cost Plastic Optical Fiber Pressure Sensor Embedded in Mattress for Vital Signal Monitoring , 2017, Sensors.