Considerations of optical damage induced by thermal effects were initiated by an apparent paradox: small and large diameter lenses with the same f -number produce an image of the Sun with the same irradiance. Thus, if one assumes that a damage threshold is given by irradiance (or intensity, as it is specified by most laser optics companies, in relation to continuous-wave lasers), all digital cameras should have the same probability of being damaged when pointed at the Sun. However, smartphones and in general small cameras are unaffected, while optical sensor arrays of larger cameras are often overheated and irreversibly damaged by the Sun. Therefore, the temperature rise responsible for the damage is not simply due to the irradiance of the Sun’s image, but is actually related to lens size in a more subtle way. A simple thermal model shows that such a temperature rise is proportional to the linear power density (power/illuminated spot diameter) at focus. A web search shows ...

中文翻译：

---

直接暴露在阳光下会损坏所有数码相机吗？

由热效应引起的光学损伤的考虑是由一个明显的悖论引发的：具有相同f值的小直径和大直径透镜产生具有相同辐照度的太阳图像。因此，如果假设损坏阈值是由辐照度（或强度，如大多数激光光学公司所指定的，相对于连续波激光器）确定的，则所有数码相机在指向时应具有相同的损坏概率太阳。但是，智能手机和一般的小型相机不会受到影响，而大型相机的光学传感器阵列通常会过热并且会被太阳不可逆转地损坏。因此，造成损坏的温度上升不仅是由于太阳图像的辐照度引起的，而且实际上与镜头尺寸的关系更为微妙。一个简单的热模型表明，这种温度上升与聚焦时的线性功率密度（功率/照明光斑直径）成正比。网络搜索显示...