| 摘要 |
PROBLEM TO BE SOLVED: To provide a high precision standard light source device in low brightness. SOLUTION: Brightness L<SB>s</SB>is defined by a light source box S<SB>0</SB>including a light source L<SB>s</SB>. Brightness L<SB>1</SB>is defined by mutual multiple diffuse reflections on an inner wall in a first integrating sphere S<SB>1</SB>, wherein the brightness L<SB>1</SB>is brightness L<SB>0</SB>on the inner wall of the first integrating sphere S<SB>1</SB>attenuated by a fixed attenuation rate in inverse proportion to the square of a radius of the first integrating sphere S<SB>1</SB>. Brightness L<SB>2</SB>is defined by mutual multiple diffusion reflections on an inner wall in a second integrating sphere S<SB>2</SB>, wherein the brightness L<SB>2</SB>is brightness L<SB>1</SB>on the inner wall of the second integrating sphere S<SB>2</SB>further attenuated by a fixed attenuation rate in inverse proportion to the square of a radius of the second integrating sphere S<SB>2</SB>. The brightness L<SB>2</SB>further attenuated at the second integrating sphere S<SB>2</SB>is defined at an exit aperture A<SB>23</SB>on the second integrating sphere S<SB>2</SB>, so that a standard light source output can be obtained. COPYRIGHT: (C)2010,JPO&INPIT
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