公开(公告)号：US11099146B1

公开(公告)日：2021-08-24

申请号：US17264412

申请日：2020-03-13

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Shaoyi Xu ,  Zhencai Zhu ,  Wei Li ,  Yanjing Sun ,  Fangfang Xing ,  Hongyu Xue ,  Qiang Peng ,  Feng Dong ,  Guang Chen

IPC: G01N27/12 ,  G01N33/24 ,  E21C39/00 ,  G01N21/41

Abstract: When the heading machine tunnels, a current generated by a current excitation source enters a coal seam through a movable cutting pick to form a stray current. The stray current collected by a backflow net returns to a negative electrode of a power supply through a transition resistor. When information such as the water content of the coal seam changes, the stray current and a potential difference across the transition resistor also accordingly change, and the coal seam water content information is converted into an electric signal. When the potential difference across the transition resistor is applied to two ends of a piezoelectric ceramic, the piezoelectric ceramic extends or compresses, and the electric signal is converted into a strain signal. A sensing optical fiber converts the strain signal into an optical signal detectable by a photoelectric detector. The optical signal is analyzed to obtain the coal seam water content information.