A conversion guide: solar irradiance and lux illuminance
A conversion guide: solar irradiance and lux illuminance
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DOI：
10.21595/jme.2020.21667
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发表时间：
2020-12-01
影响因子：
1.6
通讯作者：
Moreno, Wilfrido
中科院分区：
文献类型：
--
作者：
Michael, Peter R.;Johnston, Danvers E.;Moreno, Wilfrido
测量太阳辐照度的标准采用瓦特每平方米（W/m（2））的单位。辐照度计既昂贵又在测量低辐照度值的能力方面受到限制。在低光照条件下，测光表具有更低的成本和更高的灵敏度，利用每平方米流明或勒克斯（lx）的单位来测量每单位面积的光通量（照度）。W/m（2）和lx之间的有效转换因子将使得能够使用测光表来评估低太阳辐照条件下的光伏性能。对文献的调查发现，太阳辐照度和照度之间没有确定的和现成的“经验法则”转换标准。容易找到的互联网资源包含冲突和广泛变化的值，从688449到21000 lx，1000 W/m（2）（1太阳）的太阳辐照度。同行评审文献包含的发光效率等效值范围为21至131 lx/W/m（2）。本文探讨了太阳辐照度和照度之间的关系，并建立了一个理论和实验室测量指南之间的转换。转换因子包括标准数据、设备校准准确度和不确定度估计。基于LED的太阳模拟器的1个太阳（1000 W/m（2））的太阳辐照度为（116 +/- 3）klx，室外太阳为（122 +/- 1）klx。
The standard for measuring solar irradiance utilizes the units of watts per meter squared (W/m(2)). Irradiance meters are both costly and limited in the ability to measure low irradiance values. With a lower cost and higher sensitivity in low light conditions, light meters measure luminous flux per unit area (illuminance) utilizing the units of lumens per meter squared or lux (lx). An effective conversion factor between W/m(2) and lx would enable the use of light meters to evaluate photovoltaic performance under low solar irradiance conditions. A survey of the literature found no definitive and readily available "rule of thumb" conversion standard between solar irradiance and illuminance. Easy-to-find Internet sources contain conflicting and widely varying values ranging from 688449 to 21000 lx for 1000 W/m(2) (1 Sun) of solar irradiance. Peer-reviewed literature contains Luminous Efficacy equivalent values ranging from 21 to 131 lx per W/m(2). This manuscript explores the relationship and establishes a theoretical and laboratory measurement guide for the conversion between solar irradiance and illuminance. The conversion factor includes standards data, equipment calibration accuracy, and uncertainty estimates. Solar Irradiance of 1 Sun (1000 W/m(2)) for an LED-based solar simulator is (116 +/- 3) klx and (122 +/- 1) klx for outdoor sunlight.