Measurement system for wearable devices of intra-body communication using electro-optic technique

This paper describes a measurement system for a wearable device of intra-body communication, in which the human body is used as a transmission medium. An instrument driven by AC power overestimates a voltage signal around the human body received by the wearable device, preventing precise measurements from being performed. We developed a new measurement system using an electro-optic technique to enable precise measurements. The wearable device is electrically isolated from the instrument. The measurement system has a bandwidth from 10 kHz to 20 MHz and a 40-dB signal-to-noise ratio at a wearable transmitter output voltage of 0.36 V.