Prof.Dr. Xu-dong Wang attended the 31th annual conference of the Chinese Chemical Association and give a talk on Optical Oxygen Sensor. Prof. Dr. Xu-dong Wang was invited to participate the 31th annual conference of the Chinese Chemical Association hold in Hangzhou, China. He gave an invited talk on a background-substraction strategy to calibrate optical oxygen sensor for nearly identical response, in which he presented the lastest research in our group on optical sensor for oxygen sensor.