Development of circuit solution and design of capacitive pressure sensor array for applied robotics

Development of circuit solution and design of capacitive pressure sensor array for applied robotics

Konstantin D. Krestovnikov
Saint-Petersburg Federal Research Center of the Russian Academy of Sciences, Laboratory of Autonomous Robotic Systems, Postgraduate Student, Junior Research Scientist, 39, 14 line V.O., Saint-Petersburg, 199178, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., ORCID: 0000-0001-6303-0344

Aleksei A. Erashov
Saint-Petersburg Federal Research Center of the Russian Academy of Sciences, Laboratory of Autonomous Robotic Systems, Programmer, 39, 14 line V.O., Saint-Petersburg, 199178, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., ORCID: 0000-0001-8003-3643

Аleksandr N. Bykov
Saint-Petersburg Federal Research Center of the Russian Academy of Sciences, Laboratory of Autonomous Robotic Systems, Junior Research Scientist, 39, 14 line V.O., Saint-Petersburg, 199178, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it., ORCID: 0000-0001-8025-7209

Received 21 September 2020

Abstract
This paper presents development of pressure sensor array with capacitance-type unit sensors, with scalable number of cells. Different assemblies of unit pressure sensors and their arrays were considered, their characteristics and fabrication methods were investigated. The structure of primary pressure transducer (PPT) array was presented; its operating principle of array was illustrated, calculated reference ratios were derived. The interface circuit, allowing to transform the changes in the primary transducer capacitance into voltage level variations, was proposed. A prototype sensor was implemented; the dependency of output signal power from the applied force was empirically obtained. In the range under 30 N it exhibited a linear pattern. The sensitivity of the array cells to the applied pressure is in the range 134.56..160.35. The measured drift of the output signals from the array cells after 10,000 loading cycles was 1.39%. For developed prototype of the pressure sensor array, based on the experimental data, the average signal-to-noise ratio over the cells was calculated, and equaled 63.47 dB. The proposed prototype was fabricated of easily available materials. It is relatively inexpensive and requires no fine-tuning of each individual cell. Capacitance-type operation type, compared to piezoresistive one, ensures greater stability of the output signal. The scalability and adjustability of cell parameters are achieved with layered sensor structure. The pressure sensor array, presented in this paper, can be utilized in various robotic systems.

Key words
Pressure sensors array, pressure sensor, primary pressure transducer.

Acknowledgements
This research is supported by the RFBR project no. 16-19-00044П.

DOI
https://doi.org/10.31776/RTCJ.8406

Bibliographic description
Krestovnikov, K., Erashov, A. and Bykov, A., 2020. Development of circuit solution and design of capacitive pressure sensor array for applied robotics. Robotics and Technical Cybernetics, 8(4), pp.296-307.

UDC identifier:
681.586.2

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