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Ammonia is a gas that easily dissolves into water, there are several common detection methods,but ammonia is toxic and corrosive, the current measurement mainly uses the TDLAS direct measurement method. TDLAS is essentially a spectral absorption analysis technology, which uses the selective absorption characteristics of gas molecules for specific wavelength lasers, and analyzes the changes in the intensity of laser absorption to obtain the gas concentration. TDLAS spectroscopic absorption method can directly measure the concentration of ammonia gas, and can realize accurate measurement from % to ppb.