A Low-Cost Vital-Sign Sensor Based on Bluetooth System

摘要

In this work, a low-cost vital-sign sensor based on Bluetooth system is developed. The sensor transmits a standard Bluetooth signal toward a human chest. The Bluetooth signal is Doppler-modulated and reflected by the human chest. After receive the reflected signal, the sensor cancels out the Bluetooth information by applying the correlation technique and then obtains the human vital signs. Therefore, the sensor can shares its transceiver with a Bluetooth system and concurrent operates. Experimental results demonstrate that the developed vital-sign sensor can successfully detect the heartbeat and respiration of the human under test using Bluetooth system. The detection range is up to 1 m.