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假如能对发光二极管或者其它光源进行调制的话,那么就可以消除受光传感器的暗电流以及放大器的漂移。本文用发光二极管为光源、以光敏二极管为受光传感器的光导纤维信号检测电路为例,对这个结论作以说明。图1是发光二极管的调制电路。因发光二极管的发光输出和电流成比例,所以在恒定电流驱动的情况下,发光量几乎不发生变化。因此在图1电路中,可把发光二极管看作是开路
If you can light-emitting diodes or other light source modulation, then you can eliminate the light sensor dark current and amplifier drift. In this paper, light-emitting diodes as the light source, the photodiode as the light-sensing sensor optical fiber signal detection circuit, for example, to illustrate this conclusion. Figure 1 is a light emitting diode modulation circuit. Since the light emitting output of the light emitting diode is proportional to the current, the amount of light emitted hardly varies with constant current driving. Therefore, in the circuit of FIG. 1, the light emitting diode can be regarded as an open circuit