Fig. 4. Mechanism and experiment to prove successful ultrasonic wireless communication based on ultrasound.

(A) Binary modulation method. (B) Pulse number modulation method. (C) Experiment designed to show that the AECD could accept ultrasound transmitted across biological tissue. (D) Temperature information–coded ultrasound showing that the AECD was activated by ultrasound and began to transmit measured temperature data after accepting ultrasound from outside the biological tissue. (E) AECD temperature monitoring experiment result. Photo credit: Peng Jin, Tsinghua University.