大型彩色纹影系统像面均匀性分析

Analysis on Imaging Uniformity of a Color Schlieren Photographer

采用无大口径窗口玻璃光路系统设计了Φ1 200mm口径彩色纹影系统,并建模分析了该大型彩色纹影系统在重力、温度、气体冲击等复杂工作状况下的纹影像面照度均匀性.针对2.0mm切1/4、2.0mm切1/2、0.5mm切3/4这3种典型狭缝宽度和刀口切割量的组合,分别分析了该系统在理想状态下和考虑系统综合误差时系统像面照度的均匀性.结果表明：在考虑系统综合误差时,纹影像面均匀性较理想情况降低,在较低灵敏度下,整个像面照度不均匀性范围为-2.44%～2.45%;在中等灵敏度下,不均匀性范围为-3.43%～3.45%;在较高灵敏度下,不均匀性范围为-5.76%～5.81%,说明该系统能满足实际工程应用要求.

AΦ1200mm colorful schlieren system was designed by adopting an illumination system without any protecting windows.The theoretical optical model of theΦ1200mm colorful schlieren system was built up and the imaging uniformity of the system was studied under the complex working conditions as the gravity,temperature variation,and ambient pressure.The three typical combinations of the slit width and the cutting quantity of the knife had been considered here,which are 2mm slit width with 1/4cutting quantity,2mm slit width with 1/2cutting quantity,and 0.5mm slit width with 3/4cutting quantity.With above three combinations,the imaging uniformity of the system was analyzed under the ideal working condition and under the condition by the consideration of integral error respectively.The results show that with the consideration of integral error,the uniformity of the schlieren image is decreased compared with that of the ideal working condition.With the consideration of integral error,when the system is under relatively low sensitivity,the range of the non-uniformity is from-2.44%to2.45%;under relatively normal sensitivity,the range of the non-uniformity is from-3.43%to 3.45%;under relatively high sensitivity,the range of the non-uniformity is from-5.76%to 5.81%.