| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for measuring luminous energy capable of quantitatively evaluating luminous energy, and to provide a method of measuring luminous energy. SOLUTION: The non-signal state of a CCD camera is formed to perform the adjustment of a zero point. At this point, a calibration shutter 23 is driven to the light path cutting position shown by a solid line, so that a state that stray light does not enter the CCD camera 12 is ensured. The output signal of the CCD camera 12 at this point is sent to a luminous energy calculating part 51 and a calibration part 56 executes calibration for setting the output signal value of the CCD camera 12 to a standard (zero point) with respect to the luminous energy calculating part 51. Further, the light emitted from a calibration laser beam source 21 is attenuated by a light attenuator 22 to be incident on the CCD camera 12 through a movable mirror 9 and a relay lens 11. Correctly set light is thrown on the CCD camera 12 by switching the attenuation quantity of the light attenuator 22. The output signal of the CCD camera 12 is sent to the luminous energy calculating part 51 at this time and the calibration part 56 executes calibration with respect to the luminous energy calculating part 51 so that the respective output signal values accurately correspond to luminous energy. COPYRIGHT: (C)2007,JPO&INPIT
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