Microwave Autodyne Sensor for Monitoring of Cardiac Rhythm of Mines Workers

A design of microwave autodyne cardiac rhythm sensor for the mines workers is discussed in the paper. The sensor is a part of a system for searching people under rocks. The system design is based on placing into a miner´s lantern of radio beacon. System is activated in a case of rescue actions remotely. In this case the cardiac rhythm sensor signal modulates the beacon signal. Rescue workers by means of searching device determine the position and the state of suffered people. Principles of construction of the sensor, based on the Doppler´s effect, are shown. It was shown the use of autodyne ensures excellent performance of the sensor. The sensor construction possesses extreme simplicity. Conventional patch antenna conforms to the microwave sensor design ideally.