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什么是余弦定律

贺拉斯-贺

最後更新:2023年12月26日

什么是余弦定律

余弦定律,又称朗伯余弦定律或余弦发射定律,是照明行业的基本原理。它指出,理想漫反射表面的辐射强度与入射光线方向和表面法线之间夹角的余弦成正比。这一定律以约翰-海因里希-朗伯命名,是光学中的研究课题,在理解光线如何分布以及光线如何影响表面照明方面起着至关重要的作用。

照明的余弦定律用于计算 照度 (或辐照度)。它提供了一种数学关系,通过考虑光线照射表面的角度来确定落在表面上的光量。通过优化光源的位置和方向,照明设计师和工程师可以达到以下目的 所需的照明度 和表面的均匀性。

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照明余弦定律是照明行业的一个重要概念,因为它有助于照明系统的设计和实施。它可以根据入射角计算照度,从而优化各种应用的照明条件。了解余弦定律对实现以下目标至关重要 高效照明解决方案.

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常見問題

正弦和余弦有什么区别

正弦和余弦,又称 sin(θ) 和 cos(θ),是描述直角三角形中各边比例的数学函数。具体来说,sin(θ) 表示与角θ 相对的边的长度与斜边的长度之比,而 cos(θ) 表示与角θ 相邻的边的长度与斜边的长度之比。

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