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초음파 촉각 구현을 위한 CPLD를 사용한 Shift Register기반 다채널 초음파 집속 지연 제어 방법에 대한 연구
신덕식,박준헌,임영철,최준호,Shin, Duck-Shick,Park, Jun-Heon,Lim, Young-Cheol,Choi, Joon-Ho 한국센서학회 2022 센서학회지 Vol.31 No.5
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).