Photomultiplier line linear range testing device and method

Abstract

The invention provides a photomultiplier line linear range testing device and method, comprising a light source, a light source driver, a spectroscopic dark box, an integrating sphere, a light guide, a testing dark box, a testing electronic system and a computer. After the light source emits light, it is irradiated to the spectroscopic dark box; the spectroscopic dark box is an opaque box with a light entrance port and a light exit port. The beam splitting output is performed through the spectroscopic dark box, and the light beam is irradiated into the integrating sphere through the light exit port to mix evenly; the light exit port of the integrating sphere It is connected with the light entrance of the test dark box through a light guide; the test electronics system is used to provide the high voltage of the photomultiplier tube and measure the output signal of the photomultiplier tube; the computer is used to control the operation of the test device, including the control Control the light source driver, control the electric device in the spectroscopic dark box to realize light splitting, control and configure the test electronic system test, and read the measurement value of the test electronic system and generate the test result after processing.

Description

technical field [0001] The invention relates to the technical field of photomultiplier tubes (PMT), 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 to finally output a current signal. It is widely used in cosmic ray detection, gamma Radiation detection, medical imaging, analytical spectrometer and other low-light detection fields. The linear range is the output dynamic range, which is an important technical indicator of the detector. In the linear range, the output signal of the detector is linearly related to the radiant flux of the incident light. Detectors generally cannot operate beyond the linear range. [0003] The linear range test of the detector needs to m...

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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