蒸发是自然界和工程领域广泛存在的物理现象，直接测量蒸气在蒸发过程中运移与分布的规律具有重要意义。选择水蒸气在1370 nm 附近的吸收谱线，在不同风速情况下，利用可调谐半导体激光吸收光谱技术(TDLAS)，对自由水面蒸发时水蒸气分压沿垂直水面的高度方向进行了原位、非接触测量。测量结果表明，水蒸气运移和水分压垂直水面分布符合相似理论的预测，偏差在4%以内。

Evaporation is ubiquitous in nature and engineering. The direct measurements of vapor transport during evaporation are of great importance. A tunable diode laser emitting at around 1370 nm is used to in situ detect the water evaporation from a free water surface subject to crossing wind at various velocities. Results show that the observed profiles of water vapor partial pressure agree with the prediction of the similarity principle, with overall deviation less than 4%.