A Method of Improving the Dynamic Range of Photomultiplier Tube

Abstract

The invention relates to the technical field of photomultiplier tubes. In order to solve the problem that the dynamic range of the device is limited due to the excessive number of multiplied electrons when the current photomultiplier tube detects strong light signals, the invention provides a method for improving the dynamic range of the photomultiplier tube. Methods. When the photomultiplier tube of the present invention detects a strong light signal, the cathode current of the photomultiplier tube or the current of the dynode is greater than the set trigger threshold, and the working voltage of the dynode system or the modulation electrode is adjusted in linkage, so that the electrons entering the subsequent dynode When the number is reduced or the energy is reduced, the entire photomultiplier tube works in the linear working area. This method of improving the dynamic range of the photomultiplier tube enables the photomultiplier tube to better adapt to changes in the intensity of light signals, and can increase the dynamic range of ordinary photomultiplier tubes by 2 to 10 times or even higher on the original basis.

Description

technical field [0001] The invention relates to the technical field of photomultiplier tubes, in particular to a method for improving the dynamic range of photomultiplier tubes. Background technique [0002] A photomultiplier tube (PMT for short) is an electric vacuum photodetection device, mainly composed of a light window, a photocathode, an electron multiplication system and an anode. Its working principle is that the weak optical signal emitted by the detection target is incident on the photocathode through the light window, and the electrons of the photocathode are converted into space electron beam signals through the photoelectric effect and emitted into the vacuum, and then the electrons are multiplied by electric field acceleration and electron optical focusing. The system, after N-level multiplication, amplifies the electron beam signal N times and outputs it, and finally collects it by the anode to form the anode photocurrent and the signal voltage on the load, so...

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for improving the dynamic range of photomultiplier tubes, which solves the problem that the current photomultiplier tubes have too large a total number of electron multiplications in the working process of the current photomultiplier tubes, which causes the output signal of the anode of the device to deviate from the linear working area and is saturated, and greatly improves the working dynamic range of photomultiplier tubes.

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