ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,505,525, issued on Dec. 23, was assigned to Tongji University (Shanghai).

"Tunnel defect detecting method and system using unmanned aerial vehicle" was invented by Bin He (Shanghai), Gang Li (Shanghai), Runjie Shen (Shanghai), Zhongpan Zhu (Shanghai), Zhipeng Wang (Shanghai), Jie Chen (Shanghai) and Xudong Wang (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "Tunnel defect detecting method and system using unmanned aerial vehicle (UAV) are provided, and the UAV is equipped with a light-emitting diode (LED) module, a camera, a laser radar, an ultrasonic distance meter and an inertial measurement unit (IMU). The method includes: collecting images ...