On Near-Field Photometry
On Near-Field Photometry
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近场光度测定
DOI：
10.1080/00994480.1987.10748693
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
P. Ngai
中科院分区：
文献类型：
--
作者：
P. Ngai
目前在灯具的光度测试、评估和应用中的实践涉及远场光度计的使用。采用在与照明器的尺寸相比相对较大的距离处收集的光度数据，从而将照明器评估为点源。在远场光度测定的应用中存在两个主要限制：a）它不能提供指示灯具上的亮度的实际光度测定图案的数据：B）在灯具相对接近于其照射的表面的情况下，灯具被假定为光度测定均匀的，这使得不可能执行精确的照明计算。本文将介绍并解释近场测光理论--它。，光度数据的收集，其允许我们不将照明器视为点源，而是将其视为单独组件的组合，每个组件具有独特的光度特性。我们将概述获得近场测光数据的数学程序，并演示如何使用近场测光将显着提高我们的能力，以准确地代表luninaire的亮度，以及表面上的亮度和照度模式。
The current practice in photometric testing, evaluation and application of luminaires involves the use of far-field photometry-it., employing photometric data collected at a distance that is relatively large compared to the size of the luminaire, thus evaluating the luminaire as a point source. There are two major limitations in the application of far-field photometry: a) it is unable to provide data which indicates the actual photometric pattern of luminances on a luminaire: b) in situations where the luminaire is relatively close to the surface it is illuminating, the luminaire is assumed to be photometrically homogenous, which makes it impossible to perform accurate lighting calculations. In this paper, we will introduce and explain the theory of near-field photometry--it., thc collection of photometric data which allow us to consider the luminaire not as a point source, but as a combination of individual components, each with unique photometric properties. We will outline the mathematical procedures for obtaining near-ficld photomctric data, and demonstrate how the use of near-field photometry will dramatically improve our ability to accurately represent the luniinous intensities of a lurninaire, as well as luminance and illuminance patterns on a surface.