| 摘要 |
PROBLEM TO BE SOLVED: To reduce the effect of dark current components passing through a photodiode on photoelectric transfer signals. SOLUTION: The superimposition of a reverse-biased DC voltage VB0 and modulated voltage A sin(ω) is impressed on a photodiode 10 to detect a signal proportional to the amplitude of the AC components of a current passing through the photodiode 10, i.e., the differential conductance of the photodiode as a photoelectric conversion signal VO. This detection is performed by amplifying the terminal-to-terminal voltage of a resistance 11 serially connected to the photodiode 10, synchronous-detecting its AC components and passing into a smoothing circuit 18.
|
