A Construction Method of a Radar Sensor for Safety Monitoring Based on Check of Its Sensing Function

Abstract

The safety requirements of a radar sensor, one type of presence-sensing device, are presented, and one method is proposed for constructing the radar sensor that meets the safety requirements. An ultrasonic radar sensor and a scanning optical radar sensor for safety monitoring are described as concrete application examples of the proposed construction method. The safety requirements that concern the sensing function of the radar sensor are that the energy transmission process should be free from transmission failure and increased delay and that the specified area should be monitored. The radar sensor that meets the safety requirements can be realized by proving the radar sensor with the check function to confirm the safety requirements. More specifically, a reference object is installed in the energy transmission path, and a hazardous event is periodically produced. The check function confirms that the radar sensor can detect the hazardous event as hazard within the specified response time.