The mixing of sample gas with ozone is carried out with a double-nozzle structure and a chemical reaction of NO molecules with ozone molecules can be entirely and rapidly performed in a novel chemical reaction chamber. In this way chemiluminescene efficiency is improved. 其中的样气与臭氧的混合用双层喷嘴结构完成,可以使一氧化氮分子与臭氧分子在新型化学反应室内全面迅速发生化学反应,从而提高化学发光效率;