我们观察了在很低的光强下,光电倍增管输出光电子信号的特征。测试了充电倍增管在弱光下的工作特性,特别是暗噪声脉冲及信号单电子脉冲的微分脉高谱。讨论了单光子计数器中所用光电倍增管、前置放大器、甄别器等各部分的主要要求,并在此基础上初步试制成功较高分辨率的光子计数器。本光子计数器的长期稳定性较好、动态范围宽、灵敏度高。采用挑选过的 We observe the characteristics of photomultiplier tube output optoelectronic signals at very low light intensities. The working characteristics of the charging multiplier tube in low light were tested, especially the differential pulse height spectrum of dark noise pulse and signal single electron pulse. The main requirements of photomultiplier tubes, preamplifiers, discriminators and other parts used in single photon counters are discussed. On the basis of this, the successful trial of higher resolution photon counters is carried out. The photon counter long-term stability is good, wide dynamic range, high sensitivity. Used by the selected