| 摘要 |
PURPOSE:To enable detection with high sensitivity by removing a DC offset voltage by a capacitor and eliminating further the influence of AC-like disturbance light by a band-pass filter. CONSTITUTION:The outputs of the own light and the other light are converted to pulse signals by a photoelectric transducer 10 and is DC-amplified by a DC amplifier 61. The DC-like disturbance light such as solar light and illuminating light and the DC offset voltage generated by the offset voltage of the circuit are then removed by a capacitor. The own light and ther other light are separated by a PV log switch 63 and are passed through a band-pass filter 65 having the same central frequency as the repetitive frequency of the own light or the other light, by which the influence of the AC-like disturbance light of a fluorescent lamp or the like is eliminated. |
