During the production process of liquid hydrogen,it is necessary to monitor the para hydrogen content of liquid hydrogen products to ensure the liquid hydrogen products meet the requirements of long-term storage.The current para hy-drogen content of liquid hydrogen is mainly analyzed offline using equipment such as gas chromatograph based on the differ-ence in thermal conductivity of ortho and para hydrogen.This measurement method has a complex system and poor real-time performance.To deal with this problem,explored and studied new methods for measuring para hydrogen content,basing on the physical differences in density and nuclear magnetic moment of ortho and para hydrogen,to lay the foundation for the development of new and advanced para hydrogen content measurement equipment.
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