差分吸收光谱法是利用气体污染物在UV - VIS波段对光有不同的吸收特性来测量其平均浓度。
Differential optical absorption spectroscopy (DOAS) makes use of the flue gas pollutant different optical absorption characteristic at the UV-VIS wave band to measure their average concentration.
差分吸收光谱法的应用假定了一些理论上无法直接推导的条件，通过实验验证了这些前提条件的正确性。
Application of DOAS is based on some prior conditions that can't be directly derived from theory. These prior conditions are validated by the experiment.
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