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Contact Pressure Level Indication Using Stepped Output Tactile Sensors

Title
Contact Pressure Level Indication Using Stepped Output Tactile Sensors
Author
이승백
Keywords
tactile sensor; tactile sensor array; spatially digitized electrode; stepped output characteristics
Issue Date
2016-04
Publisher
MDPI AG
Citation
SENSORS, v. 16, NO 4, Page. 511-524
Abstract
In this article, we report on a novel diaphragm-type tactile pressure sensor that produces stepwise output currents depending on varying low contact pressures. When contact pressures are applied to the stepped output tactile sensor (SOTS), the sensor's suspended diaphragm makes contact with the substrate, which completes a circuit by connecting resistive current paths. Then the contact area, and therefore the number of current paths, would determine the stepped output current produced. This mechanism allows SOTS to have high signal-to-noise ratio (˃20 dB) in the 3-500 Hz frequency range at contact pressures below 15 kPa. Moreover, since the sensor's operation does not depend on a material's pressure-dependent electrical properties, the SOTS is able to demonstrate high reproducibility and reliability. By forming a 4 x 4 array of SOTS with a surface bump structure, we demonstrated shear sensing as well as surface (1 x 1 cm(2)) pressure mapping capabilities.
URI
http://www.mdpi.com/1424-8220/16/4/511http://hdl.handle.net/20.500.11754/48465
ISSN
1424-8220
DOI
10.3390/s16040511
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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