为了满足在极低和较高光功率范围内对光信号的探测, 提出了基于硅光电倍增管(SiPM)的弱光检测系统, 该系统包含自动调节偏压电路、电流. 电压转换电路、小信号放大电路和滤波电路。测量不同偏压下 SiPM的输出与入射光信号之间的关系, 实验结果显示, 偏压对 SiPM的输出有很大影响, 不同偏压下, SiPM的探测能力和探测范围都不相同。此外, 该系统对 25 pW到 1.75 μW的光信号都有响应, 能在极低和较高光功率范围内对光信号进行连续探测。

In order to detect optical signals in very low and high optical power range, a weak light detection system based on silicon photomultiplier (SiPM) is proposed. This system consists of auto-adjusting bias circuit, current-voltage conversion circuit, small signal amplification circuit and filter circuit. The relationship, between the output of SiPM and the incident light signal under different bias voltage was measured. The experimental results show that the bias has a great influence on the output of SiPM, the detection ability and detection range of SiPM under different bias voltage. In addition, the system has response of the 25 pW to 1.75 μW optical signals, which can achieve continuous detection of optical signals in very low and high optical power range.