Optimum design method for improving light utilization ratio of photomultiplier photocathode

Abstract

The invention discloses an optimum design method for improving a light utilization ratio of photomultiplier photocathode. The method comprises the first step of selecting shape parameters of photomultiplier geometry; the second step of describing basic geometrical characteristic layers in a program; the third step of inputting material parameters of the basic geometrical characteristic layers; the fourth step of defining an interface between adjacent basic geometrical characteristic layers; the fifth step of generating a photon in a working medium at random, wherein the direction is random and a wavelength is sampled from a detection spectrum; the sixth step of simulating the physical process of the photon in the materials and judging whether the photon reaches a photocathode interface or not; the seventh step of working out the proportion that the photon reaches the photocathode and judging whether the second step is executed again or not to obtain a changing curve of the proportion that the photon reaches the photocathode along with the shape parameter values, selecting the optimum shape parameter according to the changing curve so that the light utilization ratio of the photocathode can be improved, and the purpose of improving the performance of the photomultiplier can be achieved. According to the optimum design method, the special optimization design is carried out according to the working environment and the detecting spectrum of the photomultiplier.

Description

technical field [0001] The invention relates to the technical field of light detection, in particular to an optimal design method for improving the light utilization rate of a photocathode of a photomultiplier. Background technique [0002] Photomultiplier (Photomultiplier) is widely used in spectral analysis, high-energy physics, environmental monitoring, remote sensing satellite detection and other fields. device, its typical structure is as figure 2 . Its working principle is to convert the received light radiation into electrons, and output a sufficiently large electrical signal through the amplification of the multiplier. A component that converts light signals into electrical signals through the photoelectric effect is called a photocathode. [0003] The photocathode is a thin-layer material that receives photons and emits photoelectrons. It has a small work function. Generally, the photocathode material is plated on the inner surface of the incident window in a vac...

AI Technical Summary

Problems solved by technology

The shape of the entrance window affects the ratio of light incident from the entrance window to the photocathode, thereby affecting the utilization of light and ultimately affecting the performance of the photomultiplier

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