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由于实际光源的发光体都有一定的大小,而且向各个方向发射的光通量又不均匀,因此测试和计算都比较麻烦,一般实验室没有专门设备,不便进行测量。我们用废分光计的度盘,再配合一些简单的支架(如铁架台),加上照度计,较准确地测定了小型电光源的总光通量。一、原理根据光通量和光照度的定义,通过面积为ΔS的光通量为(图1) ΔF=IΔΩ=EΔS (1) 式中I为发光强度,△Ω为面积ΔS对光源所张的立体角,E为面积ΔS上的照度。由(1)式可见,只要测量出照度E及面积ΔS,即可算出光源在ΔΩ立体角内所
As the actual light source has a certain size of the luminous body, but also to all directions of the luminous flux is not uniform, so the test and calculation are too much trouble, the general laboratory without special equipment, inconvenient to measure. We use discarded disc spectrometer, coupled with some simple support (such as iron stand), coupled with the meter, a more accurate determination of the total luminous flux of small electric light. First, the principle According to the definition of luminous flux and luminous intensity, the luminous flux through the area of ΔS is (Figure 1) ΔF = IΔΩ = EΔS (1) where I is the luminous intensity, △ Ω is the area angle ΔS, As the area on the illumination of ΔS. From (1) shows, as long as the measured illuminance E and area ΔS, you can calculate the light source in the solid angle