资 源 简 介
Radiant and Luminous Flux
光源的辐射通量随光源和波长而变化。理解变化是照明设计的关键
物理学家研究系统辐射电磁能量会使用测量仪器,在平时的MKS单位能量。由系统发出的能量,你将获得焦耳。辐射能、辐射通量P的生产时间率将被定义为:
where t is TIme. The MKS unit of radiant flux would be, therefore, joules per second or watts.
Generally, the radiant flux from a source differs for different wavelengths. The flux at a given wavelength, λ, and in a spectral interval dλ is given by Pλdλ。 A plot of Pλ versus λ gives the power spectrum of the radiator. Power spectra may be either conTInuous or discrete. The usual tungsten filament lamp has a conTInuous power spectrum like that of Figure 1. The mercury lamp spectrum shown in Figure 2 is a typical line spectrum with the spectral lines corresponding to energy level transiTIons. Fluorescent lamps have discrete spectra superimposed on a continuous spectra. The total radiant flux P emitted by a light source is the integral of Pλdλ over all wavelengths,