A flexible capacitive tactile sensing array for pressure measurement

This paper presents a flexible capacitive tactile sensing array based on Flexible Printed Circuit Board(FPCB) technology. Several prototype flexible tactile sensors have been successfully fabricated by using simple processes. The sensing array consists of two flexible printed circuit boards as sensing electrodes and insulation layer between them. This simple design can effectively reduce the complexity of the device and make the device flexible that is immune from damage under large deformation. The corresponding scanning circuits and data processing are also designed and implemented. Experimental characterization of a sensing element shows that the full-scale range of detectable force is 9.5N, the sensitivity is 14.38% /N, the calculated non-linear error is 1.95%, its repeatability error is 5.00%. The capacitive tactile sensor can provide reliable forces applied on its surface and visually pressure distribution.

[1]  Hiroyuki Shinoda,et al.  Robot skin based on touch-area-sensitive tactile element , 2006, Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006..

[2]  M.-Y. Cheng,et al.  A flexible capacitive tactile sensing array with floating electrodes , 2009 .

[3]  Armen P. Sarvazyan,et al.  Mechanical Imaging of the Breast , 2008, IEEE Transactions on Medical Imaging.

[4]  T. Krouskop,et al.  Elastic Moduli of Breast and Prostate Tissues under Compression , 1998, Ultrasonic imaging.

[5]  S K Hwang,et al.  Development of a tactile sensing system using piezoelectric robot skin materials , 2013 .

[6]  Chang Liu,et al.  Institute of Physics Publishing Journal of Micromechanics and Microengineering Development of Polyimide Flexible Tactile Sensor Skin , 2022 .

[7]  Shuo-Hung Chang,et al.  An integrated flexible temperature and tactile sensing array using PI-copper films ☆ , 2008 .

[8]  S. Sokhanvar,et al.  A multifunctional PVDF-based tactile sensor for minimally invasive surgery , 2007 .

[9]  Milan Sonka,et al.  Image Processing, Analysis and Machine Vision , 1993, Springer US.

[10]  P. Lancaster,et al.  Surfaces generated by moving least squares methods , 1981 .

[11]  M. Haider,et al.  Flexible capacitive sensors for high resolution pressure measurement , 2008, 2008 IEEE Sensors.

[12]  Masahiro Ohka,et al.  Sensing characteristics of an optical three-axis tactile sensor under combined loading , 2004, Robotica.

[13]  Hyung-Kew Lee,et al.  Normal and Shear Force Measurement Using a Flexible Polymer Tactile Sensor With Embedded Multiple Capacitors , 2008, Journal of Microelectromechanical Systems.

[14]  Rafael C. González,et al.  Digital image processing using MATLAB , 2006 .

[15]  E. Reissner,et al.  Finite Deflections of Sandwich Plates , 1948 .

[16]  N. Otsu.  A threshold selection method from gray level histograms , 1979 .

[17]  S. Timoshenko,et al.  THEORY OF PLATES AND SHELLS , 1959 .

[18]  Hongki Kim,et al.  Capacitive tactile sensor array for touch screen application , 2011 .

[19]  Suki Kim,et al.  A touch sensor readout circuit using switched- capacitor charge pump , 2012, IEICE Electron. Express.

[20]  Hyung-Kew Lee,et al.  A Flexible Polymer Tactile Sensor: Fabrication and Modular Expandability for Large Area Deployment , 2006, Journal of Microelectromechanical Systems.

[21]  J. Engel,et al.  Polymer micromachined multimodal tactile sensors , 2005 .