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图1和图2分别为“正焦”和“背焦”式抗风太阳灶外貌。它们的反射镜面由若干个截头圆锥环带组成,环带用冷轧薄钢带制作,其上贴有镀铝薄膜。环带由数条铝肋固定,铝肋构成球面。由于抗风太阳灶的反射镜面不是连续的曲面,环带之间有一定的间隙,故增大了抗风能力。实际上,这种不连续环带构成的是一种菲涅耳反射镜。焦点与入射阳光同居反射面一侧的称“正焦”式抗风灶,焦点与入射光分居反射面二侧的称“背焦”式抗风灶。二者相比,“背焦”式抗风灶效果较好。图3和图4是它们的光学原理图。据报道,国外制成的这种抗风灶,焦面温度可高达600℃。
Figure 1 and Figure 2, respectively, “positive coke” and “back coke” type wind-resistant solar cooker appearance. Their mirrors consist of several truncated conical rings, made of cold-rolled thin strips of aluminum with aluminum foil attached. Belt by a number of aluminum ribs fixed, aluminum ribs constitute the sphere. As the solar wind mirror reflector surface is not continuous, there is a certain gap between the ring, it increases the wind resistance. In fact, this discontinuous annulus constitutes a Fresnel reflector. The focal point and the sun side of the incident co-reflection side of the called “positive coke” type wind-resistant stove, the focal point and incident light separated reflective side of the two sides of the “back focus” style wind stove. Compared with the two, “back focus” type wind-resistant stove is better. Figure 3 and Figure 4 are their optical schematic. It is reported that such a wind-resistant stove made abroad, the focal surface temperature can be as high as 600 ℃.