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TechTouch – A Look Under the Hood of an Advanced Tactile Sensor

November 2nd, 2011 Gavin Corley etc.

Syntouch, a startup company associated with the University of Southern California, is in the business of developing tactile sensors for prosthetic and robotic applications. Their primary tactile sensor platform is called the BioTAC, and the firm’s website has some great videos looking at the underlying technology which goes into making these types of sensors.

The BioTAC prototype system has the form factor of a finger tip and features 3 types of sensors for providing tactile feedback. The primary pressure sensor consists of an array of electrodes covered in a conductive fluid which lies between an exterior membrane of textured skin and the interior electronic housing. When the outer membrane comes into contact with an object the conductive fluid is displaced producing large changes in the electrical impedance detected by the electrodes in the array. This change in impedance at each of the electrode locations can then be used to estimate the magnitude and location of the force in contact with the Bio-TAC.

In order to provide additional feedback for textured surfaces, the conductive fluid is also coupled to a pressure sensor which detects sounds waves generated by the vibration of the fluid as it moves over the surface. As different textured surfaces produce unique vibration patterns, the Bio-TAC can identify a given texture from its associated vibration waveform.

Just in case that wasn’t enough, Syntouch also included a thermsistor to detect temperature changes at the outer membrane. Check out this video for a more detailed look at the Bio-TAC system in use.

http://youtu.be/evaZePZt03w

Product page: Syntouch technology page…

More videos from Syntouch…

Gavin Corley

Gavin holds a first-class Bachelor’s degree in Electronic Engineering degree from the University of Limerick and a Ph.D. in Biomedical Engineering from the National University of Ireland, Galway. He is currently a post-doctoral research and project leader at the NUI Galway where he has spent the last 2 years leading the product development and commercialization of two novel technologies for the management of varicose veins and chronic venous leg ulcers. He has published several research papers in the fields of anatomy, physiology and medical physics and is the lead author of one patent application to date. In his free time Gavin has been known to swim, cycle and hum a tune or two.

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