| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for measuring light intensity of transmitted light and reflected light, even if disturbance light enters by suppressing an influence. SOLUTION: The on/off state of light irradiated at a light intensity measuring time is switched periodically, and an output from a photodetector is taken repeatedly synchronously with a period of irradiation/non-irradiation, and an integrated value of output values at the non-irradiation time is subtracted from an integrated value of the output at the irradiation time, to thereby eliminate an influence of the output value caused by disturbance light. COPYRIGHT: (C)2008,JPO&INPIT
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