基于直线光路布局的纹影法测量火焰温度

测量火焰不同位置的温度对研究火焰结构具有重要意义.目前纹影法测量火焰温度多采用Z型布局的光路.为了在未来空间实验中将纹影法与其他光学方法集成开展多类型实验观测，摒弃了纹影法传统的Z型光路，采用直线型光路布局，针对光源、透镜、刀口切割量等因素对纹影系统灵敏度的影响开展研究，优化了直线型纹影系统.以蜡烛火焰为研究对象，对优化后的纹影系统进行标定，观测了其纹影图像，计算了蜡烛火焰中多处位置的火焰温度，并将计算结果与实测结果进行比较.结果表明，采用本研究设计的直线型纹影系统可以实现对火焰温度的精确测量.

Flame Temperature Measurement by a Straight-type Schlieren Method

It is critical to determinate the temperature distribution of flame for studying its structure. In this paper, the schlieren method of the straight-type, instead of the Z-type in common used, is employed for the sake of compatibility with other optical methods in future space experiments with different purposes. Moreover, the design of straight-type schlieren system is optimized by investigating the effects of light source, lens, and knife edge on the system sensitivity. Then, the schlieren images of a candle flame are recorded using the optimized schlieren system after calibration. The temperature distribution calculated from these images coincides with those measurement through thermocouples, thus the flame temperature can be obtained accurately from the straight-type schlieren system.