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Research on Error Compensation Method of Photomultiplier Tube Time Measurement

Wang Chong Dang Wen-Bin Zhu Bing-Li Yang Kai Yang Jia-Hao Han Jiang-Hao

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Research on Error Compensation Method of Photomultiplier Tube Time Measurement

Wang Chong, Dang Wen-Bin, Zhu Bing-Li, Yang Kai, Yang Jia-Hao, Han Jiang-Hao, et al.
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Research on Error Compensation Method of Photomultiplier Tube Time Measurement

Abstract: In order to improve the temporal resolution of photomultiplier tubes, our research group has conducted in-depth research on photomultiplier tubes based on microchannel plates that are widely used at present. The time resolution of photomultiplier tube based on microchannel plate is limited by the transit time of photoelectric signal in each part, including the transit time of photoelectric signal in the transmission process of photocathode to microchannel plate, the transit time of photoelectric signal in microchannel plate time, the transit time of the photoelectric signal from the microchannel plate to the detector anode, and the transit time of the photoelectric signal on the anode to the electrode port. The transit time of the whole process has a certain degree of influence on the time information measurement of the optoelectronic signal. In this study, various parameters affecting the time resolution of the photomultiplier tube were analyzed, and it was found that the different positions of the photoelectron signal on the anode would bring errors to the measurement of the arrival time of the signal at the anode, and the photoelectric signal was transmitted to the electrode port at the impact point of the anode The time spent will cause the signal measurement time to lag behind the real time, which indirectly affects the time resolution of the system. Therefore, a specific study was carried out on the time measurement error of the signal on the anode, and it was determined that the difference of the photoelectron signal on the anode position was an important factor causing the signal time measurement error, and a simple and effective error compensation method was proposed. In the research process, the delay line anode is used, and the positional resolution principle of the photoelectric signal is used to obtain the position information of the photoelectron signal on the anode, and the position information is converted into the time information transmitted from the position to the electrode port. The theoretical value of the transit time on the anode is offset, eliminating unnecessary time in the time-of-arrival measurement of the photoelectron signal. The time measurement error of the optoelectronic signal is compensated by this time information. The experimental results show that the error compensation method can effectively improve the time measurement accuracy of optoelectronic signals, and provide solutions and theoretical basis for improving the time resolution of photomultiplier tubes based on microchannel plates.

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