Aiming at the problem that weak photoelectric signal is difficult to be detected by photomultiplier tube（ PMT）

taking CR131 as the research object

a weak photoelectric signal detection system based on μC/OS-Ⅱ is designed. The system uses high-performance

low-power consumption STM32 F103 as the main controller

with power module

weak photoelectric signal detection module

signal processing module

communication module and human-computer interaction module. After hardware design and programming

the system implements the function of detecting weak photoelectric signals by using PMT. The experimental results show that the designed system broadens the detection range of photoelectric signal

and it can effectively reduce the noise and improve the signalto-noise ratio of weak photoelectric signal detection.