Improvement of safety integrity level by multiplexing radio wave sensors
Eugene Kim, Yoji Yamada, Shogo Okamoto · 2017
Human presence sensing is essential to a humanrobot collaborative operating system, and has attracted increasing research attention in the field of manufacturing. This study involves investigating the application of a high-speed response, light weight, and compact size radio wave sensor to detect human motion. Specifically, there is a paucity of studies on the usage of radio wave sensors for human detection in the field of machine safety. In this study, an experiment was performed by using a 24 GHz radio wave sensor to detect the location and speed of a moving sample object. The statistical error of the sensor was distinguished by using the variance of the measured values, and the concept of coverage interval was used in reliability evaluation of the sensor. The safety integrity level was improved by multiplexing the radio wave sensors to meet the requirements of IEC/TS 62998.