| 摘要 |
PURPOSE:To make the separation and detection of each illuminating light when natural light and artifical light exist simultaneously by generating the photodetected output separated with a high pass filter and the photodetected output subtracted of said photodetected output. CONSTITUTION:The photodetected signal by a photodetector 20 is processed with an HPF 22 which allows the passage of >=100Hz frequency components, and the illuminating light detected signal corresponding to artificial illumination by a commercial AC power source is separated. The output of this HPF 22 is applied to a subtractor 23, and the illumnating light detected signal by the remaining natural light is generated from the subtractor 23. Hence, each of the illuminating light at the state where the natural light and the artificial light exist simultaneously is separated and detected. |
