| 摘要 |
A device for measuring the intensity of incoming light is disclosed. This device includes a rotatable light blocking unit which interrupts incident signal light at short regular intervals. The device also includes a light source which emits certain light different from the signal light while the signal light is interrupted by the block unit, and a measurement unit for measuring intensity values of the signal light and the certain light. A correction unit is provided for correcting the measured signal light intensity based on the certain light intensity. A calculator unit calculates a correction value through comparison of the intensity of the certain light to a reference value. The correction unit uses this correction value to correct the signal light intensity.
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