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Photomultiplier linearity measurement system and method

A measurement system and photoelectric multiplication technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc.

Active Publication Date: 2019-01-29
JIANGSU SINOGRAM MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the production and processing technology of photomultiplier tubes, the difference in current amplification of photomultiplier tubes of the same process and batch under the same working voltage may be huge, and there may be more than 10 times or even greater differences.

Method used

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Embodiment Construction

[0047] In general, the long-wavelength range of the spectral response characteristics of the photomultiplier tube depends on the photocathode material, and the photomultiplier tube only provides the user with the light sensitivity of the cathode and anode when it leaves the factory. Due to the production and processing technology of the photomultiplier tube, the difference in current amplification factor of the photomultiplier tube of the same process and the same batch under the same working voltage may be huge, and there may be more than 10 times or even greater differences. In instruments and equipment that use multiple photomultiplier tubes for precision measurement, it is necessary to measure the working voltage and gain of each photomultiplier tube and its linearity before use, and use its linearity and gain to design a special working circuit for compensation, including screening A photomultiplier tube that does not meet the requirements, that is, a photomultiplier tube t...

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Abstract

The invention relates to a photomultiplier linearity measurement system and method. The system comprises a light source and control system, a splitting system and a measurement system; the light source and control system comprises an LED and a pulse circuit; the LED generates light; the pulse circuit controls the LED; the splitting system comprises a light guide and a light shielding sheet; the light guide is used to balance the light intensity and direction; the LED is embedded into just the center of the light guide; and the measurement system comprises a photomultiplier bleeder circuit, a high voltage power supply, a shaping and amplification circuit and a data collector. The linear photomultiplier measurement system can control light emission of the LED and change of the light shielding sheet to complete photomultiplier linearity measurement in one step.

Description

Technical field [0001] The invention relates to the technical field of photomultiplier tube linear measurement, in particular to a photomultiplier tube linear measurement system and method. Background technique [0002] The photomultiplier tube is a mature technology and widely used photodetection device, which is widely used in photon counting, very weak light detection, chemiluminescence, bioluminescence research, very low energy ray detection, spectrophotometer, polarimeter, colorimeter , Illuminance meter, dust meter, turbidity meter, densitometer, thermoluminescence meter, radiometer, scanning electron microscope, biochemical analyzer and other equipment. [0003] In general, the long-wavelength range of the spectral response characteristics of the photomultiplier tube depends on the photocathode material, and the photomultiplier tube only provides the user with the light sensitivity of the cathode and anode when it leaves the factory. Due to the production and processing tec...

Claims

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Application Information

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IPC IPC(8): G01R31/26G01M11/00G01D18/00
CPCG01D18/00G01M11/00G01R31/2637
Inventor 吕绮雯吴和宇
Owner JIANGSU SINOGRAM MEDICAL TECH CO LTD