Photomultiplier linear range testing device and method

Abstract

The invention provides a photomultiplier linear range testing device and method. The photomultiplier linear range testing device comprises a light source, a light source driver, a light splitting camera obscura, an integrating sphere, a light guide piece, a testing camera obscura, a testing electronics system and a computer. The light source emits light and irradiates the light-splitting dark box.The light splitting camera obscura is an opaque box body with a light inlet and a light outlet, light beam splitting output is carried out through the light splitting camera obscura, and the light beam is irradiated into the integrating sphere through the light outlet to be uniformly mixed. A light outlet of the integrating sphere is connected with a light inlet of the test camera obscura througha light guide piece. The test electronics system is used for providing high voltage for working of the photomultiplier and measuring an output signal of the photomultiplier. The computer is used forcontrolling the operation of the test device, and is used for controlling the light source driver, controlling the electric device in the light splitting dark box to realize light splitting, controlling and configuring the test of the test electronics system, reading a measurement value of the test electronics system and generating a test result after processing.

Description

technical field [0001] The invention relates to the technical field of photomultiplier tubes (PMTs), in particular to a device and method for testing the linear range of photomultiplier tubes. Background technique [0002] A photomultiplier tube (PMT) is a vacuum detection device that uses the photoelectric effect to convert optical signals into electrical signals and uses the secondary electron emission effect to amplify the electrical signals step by step and finally output current signals. It is widely used in cosmic ray detection, gamma Various low-light detection fields such as ray detection, medical imaging, and analytical spectrometer. The linear range is the output dynamic range, which is an important technical index of the detector. In the linear range, the output signal of the detector has a linear relationship with the radiant flux of the incident light. Detectors generally cannot operate beyond the linear range. [0003] The detector linear range test needs to...

AI Technical Summary

Problems solved by technology

The light intensity of the two light sources of the dual optical path method needs to be calibrated before use, and the light intensity of the two light sources is required to be as consistent as possible with the voltage change characteristics. The light source needs high stability. After long-term use, the light source characteristics change. It is more cumbersome to re-calibrate or replace the light source

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