The emission of carbon dioxide (CO2) by thermal power plants is the main factor leading to the greenhouse effect. The measurement of CO2 is of great significance to carbon emission data statistics. In this paper, a measurement system based on tunable diode laser absorption spectroscopy (TDLAS) was built to measure the spectrum of CO2 near 1579 nm. To simplify the experimental system, a direct absorption signal fitting method is proposed to replace etalons for time‐frequency conversion. The method was applied to the measurement of four different concentrations of CO2 in the range of 7%–16%, and the measurement results were compared with the multipeak method, another etalon‐free method. The results show that the mean relative error of the measurement results is 4.23%, which is 1.76% lower than the measurement results of the multipeak method. The experimental research provides a feasible idea to simplify the CO2 measurement system based on TDLAS.

中文翻译：

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基于直接吸收信号拟合的无标准具CO2测量研究

二氧化碳排放量（CO2）火电厂的排放是导致温室效应的主要因素。 CO 的测量2对碳排放数据统计具有重要意义。本文构建了基于可调谐二极管激光吸收光谱（TDLAS）的测量系统来测量CO的光谱21579海里附近。为了简化实验系统，提出了一种直接吸收信号拟合方法来代替标准具进行时频转换。该方法适用于四种不同浓度CO的测量2在7%~16%的范围内，测量结果与另一种无标准具方法多峰法进行了比较。结果表明，测量结果的平均相对误差为4.23%，比多峰法测量结果降低了1.76%。实验研究为简化CO2提供了可行的思路2基于TDLAS的测量系统