Study on Measurement of Cl2 Emission Concentration by Differential Absorption Spectroscopy

An ultra-low emission Cl-2 monitoring optical system based on differential optical absorption spectroscopy has been set up. We have found through comparison experiments that UV reflection enhanced aluminum is damaged and the dielectric film mirror is intact under high concentration of Cl-2. Then verify the performance characteristics of ultra-low Cl-2 emission online monitoring device. The maximum absorbance of 50ppm Cl-2 exceeds 0.1, while the 30ppm Cl-2 reaches 0.063, so the measurement range can be 0-95 mg/m(3), which meets the maximum allowable emission concentration of Cl-2 required by the new regulations for detection of 65mg/m(3).