公开(公告)号：US20230304936A1

公开(公告)日：2023-09-28

申请号：US18318045

申请日：2023-05-16

Applicant: SHENYANG INSTITUTE OF AUTOMATION, CHINESE ACADEMY OF SCIENCES

Inventor： Lanxiang SUN ,  Haibin YU ,  Shuo LI ,  Zhibo CONG ,  Yang LI ,  Wei DONG

IPC: G01N21/71

CPC classification number: G01N21/718 ,  G01N2201/023 ,  G01N2201/0218

Abstract: An online detection device underwater elements includes an LIBS system in a sealing pressure chamber and an external airflow control system. The airflow control system has a gas probe bin and a gas source. An opening is formed at one end of the gas probe bin while the other end and the sealing pressure chamber are hermetically partitioned through a glass window. A laser in the LIES system outputs laser to an underwater object surface to be detected for generating plasma spectra. A spectrometer collects plasma spectra returned along an original optical path. When the device operates in water, the balance gas storage tank produces gas with the same pressure as underwater. A flow model is invoked according to the current water pressure to accurately control the air flow rate to form a stable gas environment in the gas probe, which improves the plasma excitation and collection efficiency.