Preparation And Measurement Of Flexible Tactile Sensing Unit

Tactile is a form of manifestation that by skin are able to perceive the outside world, suchas pressure, temperature, humidity, etc. Based on the principle of tactile, tactile sensor hasbeen applied to different fields, mainly to the field of intelligent robot. Based on the principleof tactile, tactile sensor has been applied to different fields, mainly to the field of intelligentrobot. Tactile sensor being an important means to perceive outside information for theintelligent robot, its flexibility has become hot points of research in recent years. According tothe different tactile principle and materials, the scholars at home and abroad has successfullydeveloped the tactile sensor, but with some limitations. Therefore, this thesis attempts to putforward the flexible tactile sensor based on wireless passive and has done the in-depth study.First, in order to achieve the flexibility of tactile sensor, the choice of flexible substrate isa of vital importance. After a long period of trial and error, the author has chosenpolydimethylsiloxane PDMS as the flexible substrate, due to its good flexibility andexcellent qualities. Aiming at solving the problems which arise during thepolydimethylsiloxane adhering to metal materials, this thesis take advantage of plasmatechnology combined with the surfactant-modified technology on flexible substrates, afterwhich the adhesion between flexible substrate and metal materials has been improved on agreat scale.Secondly, so as to tackle the flexible electrode’s function failure in the course of thestretch, this thesis introduces a new method for the preparation of flexible electrode, andproposed wrinkled electrodes structure having a periodic structure to guarantee that flexibleelectrode still remains good stability and reliability during the stretching.Finally, blending the carbon nanotubes and PDMS have equipped the composite, withnot only the chemical stability and stretchability of PDMS, but also the electroconductibilityof carbon nanotubes. Using the no wrinkled CNTs/PDMS composite as the sensitive unit andthe inductance as the outside unit, the author has developed a sensor of wireless passive usedto detect the finger bent.All in all, this thesis has carried out the finger bent test used the passive wireless tactilesensors. The test results shows that the signal shift is quite obvious in terms of differentdegrees of finger bent, which means passive wireless tactile sensor was initially applied to the field of fingers bend induction. However, the degree of bending the fingers shift analysis ofthis signal can only qualitative, this thesis fingers out the follow-up study.