SIPM在脉冲光检测系统中的应用研究

为了实现硅光电倍增管(silicon photomultiplier,SIPM)对超出光子计数极限的微弱脉冲光信号的测量,建立了基于SIPM积分工作模式的脉冲光检测系统。测试了SIPM在同一光信号照射下,偏置电压与增益以及信噪比之间的关系,并测试了同一增益条件下,SIPM对不同光信号的响应特性。结果表明:SIPM在积分工作模式下,其增益可以达到104以上,并随着偏置电压的增加而指数增长;其信噪比也随着电压的增加而增加,在光强比较微弱的情况下,SIPM对光强是线性响应的。所设计的系统可以在一定程度上替代光电倍增管进行微弱脉冲光信号的测量。

Study on silicon photomultiplier (SIPM) in optical pulse measurement system

In order to utilize silicon photomultiplier (SIPM) to measure the weak optical pulses exceeding photo counting limit, a SIPM-based-on optical pulse measurement system was established. Firstly, we test the relationships between the gain and the SIPM bias voltage, as well as the signal to noise ratio and SIPM bias voltage, under the condition of the same light. Then, under the same bias voltage, the optical intensity response characteristic of SIPM was investigated. The results show that, when the SIPM works in the integration mode, its gain is larger than 10⁴, and increases in exponential growth with the SIPM bias voltage. The SIPM has a linear response of the weak optical pulses. In a word, this SIPM-based-on optical signal measurement system can be used to measure weak optical pulses instead of photomultiplier tube's.