An ultrasonic rotary encoder and its application to torque estimation. - Masaharu Hara; Shigeru Oho; Yuto Kaneko (SAS, 2018)

Practical Aspects of Ultrasonic Rotary Encoder - Probe Placing, Real-Time Operation, and Automotive Bench Test. - Shigeru Oho; Yuto Kaneko; Masaharu Hara; Yoshiji Oose; Jun Fukuda (IEEE Trans. Instrum. Meas., 2019)