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利用气体对光吸收的原理，建立了双光路测量ＳＯ_２的数学模型以及测量系统框图，讨论了关键参数的选择，给出一组（０－９９９９）ｐｐｍ（１０－６）范围内，实际在线测量标准误差小于±５０ｐｐｍ的数据。
Based on the principle of gas absorption, a mathematical model of dual-path SO_2 measurement and a block diagram of measurement system are established. The selection of key parameters is discussed. A set of (0-9999) ppm (10-6) Standard error is less than ± 50ppm data.