The second harmonic data with TDLAS/WMS

Oxygen is one of the most adverse gas that contaminates sterile drugs in glass medicine bottle, so it is of great significance to detect oxygen concentration for glass medicine bottle in order to ensure the asepsis of drug and the stability of ingredients. Wavelength modulation spectroscopy (WMS) is applied to achieve online oxygen concentration detection by the single-line spectrum analysis for the advantages of non-contact and high sensitivity. Unlike the gas detection in cells, the oxygen concentration detection in open-path optical environment is extremely challenging owing to the short light path length and random ambient noises. Consequently, we open two sets ofsecond harmonic data to further TDLAS/WMS applications on this significant topic.