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http://dx.doi.org/10.46670/JSST.2022.31.5.324

A Study on the Shift Register-Based Multi Channel Ultrasonic Focusing Delay Control Method using a CPLD for Ultrasonic Tactile Implementation  

Shin, Duck-Shick (Smart Electrics Research Center, Korea Electronics Technology Institute)
Park, Jun-Heon (Smart Electrics Research Center, Korea Electronics Technology Institute)
Lim, Young-Cheol (Department of Electrical Engineering, Chonnam National University)
Choi, Joon-Ho (Department of Electrical Engineering, Chonnam National University)
Publication Information
Journal of Sensor Science and Technology / v.31, no.5, 2022 , pp. 324-329 More about this Journal
Abstract
This paper proposes a shift-register-based multichannel ultrasonic focusing delay control method using a complex programmable logic device (CPLD) for a high resolution of ultrasonic focusing system. The proposed method can achieve the ultrasonic focusing through the delay control of driving signals of each ultrasonic transducer of an ultrasonic array. The delay of the driving signals of all ultrasonic channels can be controlled by setting the shift register in the CPLD. The experiment verified that the frequency of the clock used for the delay control increased, the error of the focusing point decreased, and the diameter of the focusing point decreased as the length of the shift register in the proposed method. The proposed method used only one CPLD for ultrasonic focusing and did not require to use complex hardware circuits. Therefore, the resources required for the design of an ultrasonic focusing system could be reduced. The proposed method can be applied to the fields of human computer interaction (HCI), virtual reality (VR) and augmented reality (AR).
Keywords
Ultrasonic; Haptic; Tactile; Delay control method; Ultrasonic focusing method;
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