Method for improving controllability and consistency of cathode quantum efficiency of photomultiplier

Abstract

The invention provides a method for improving the controllability and consistency of the cathode quantum efficiency of a photomultiplier. The method comprises the following steps: acquiring photocurrent curves in the preparation process of photocathodes with different quantum efficiencies; extracting angle reference ranges of photocurrent curve slopes corresponding to set quantum efficiency intervals; in the process of preparing a photoelectric cathode, selecting a corresponding angle reference range according to a quantum efficiency interval needing to be reached; and on the basis of the selected angle reference range, comparing the angle of the actual photocurrent curve slope with the angle reference range in the preparation process, and adjusting the on-going cathode preparation process, so as to make the angle of the photocurrent curve slope continuously approach the angle reference range of the required quantum efficiency in the cathode preparation process, and finally, manufacturing the photoelectric cathode with the required quantum efficiency. According to the regulation and control method, the expected quantum efficiency value can be set according to the given reference value, and the controllability of the quantum efficiency can be improved in the actual production process, so that the consistency of the quantum efficiency of the photomultiplier is improved, the uncertainty caused by independently regulating and controlling a certain quantum efficiency is avoided, and the regulation and control difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of photomultiplier tubes, in particular to the preparation process of the cathode of the photomultiplier tube, and in particular to a method for improving the controllability and consistency of the quantum efficiency of the cathode of the photomultiplier tube. Background technique [0002] The photomultiplier tube is a vacuum photodetection device that can convert weak light signals into electrical signals, has extremely high sensitivity and ultra-fast time response characteristics, and can work in the spectral regions of ultraviolet, visible and near-infrared regions. A dynode is arranged inside the tube, and the dynode collects and emits the electrons emitted by the previous stage to the next pole. Widely used in photon counting, extremely weak light detection, chemiluminescence, bioluminescence research, extremely low energy ray detection and other equipment. [0003] The quantum efficiency of the photom...

AI Technical Summary

Problems solved by technology

For example, for different types of photomultiplier tubes, the requirements for the quantum efficiency control of photocathode are different, and in the production line production process, there are cross-production situations, the process control is difficult, and it is impossible to directly judge according to the phenomenon in the cathode production process Therefore, the controllability and consistency of quantum efficiency are particularly important

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