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Photomultiplier tube homogeneity testing system and testing method based on galvanometer

A photomultiplier tube and testing system technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of difficult batch detection of PMT uniformity, difficulty in ensuring accurate illumination, low light source displacement accuracy, etc. The effect of correcting position, simple construction and high control precision

Inactive Publication Date: 2014-09-24
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the fiber-coupled test method, the system is complex to build, and the coupling process of multiple fibers may introduce more errors, making it difficult to detect the uniformity of PMTs in batches; In PMT, the accuracy of light source displacement is low, and it is difficult to ensure that each effective detection unit of PMT is accurately irradiated

Method used

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  • Photomultiplier tube homogeneity testing system and testing method based on galvanometer
  • Photomultiplier tube homogeneity testing system and testing method based on galvanometer

Examples

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Embodiment 1

[0034] like figure 1 As shown, in this embodiment, the test system for the uniformity of the photomultiplier tube based on the galvanometer includes: a light source 1, a collimator 2, an aperture 3, an optical filter 4, a galvanometer 5, and a neutral density filter 6 And computer; Wherein, collimator 2 comprises collimating hole 21 and convex lens 22; Light source 1 sends the continuous light of divergence; After collimating hole 21, becomes parallel continuous light by convex lens 22, adjusts the diameter of light beam through diaphragm 3 , so that the diameter of the beam is slightly smaller than the diameter of the effective detection unit of the photomultiplier tube; the continuous light is converted into monochromatic light consistent with the fluorescence received by the photomultiplier tube through the filter; the beam is reflected by the galvanometer and incident on the photoelectric On the multiplier tube; the vibrating mirror includes two opposite mirrors, which are...

Embodiment 2

[0043] like figure 2 As shown, in this embodiment, the light source 1 adopts a monochromatic laser, and the wavelength is within the response range of the PMT, so there is no need to add an optical filter, and other structures are the same as the first embodiment.

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Abstract

The invention discloses a photomultiplier tube homogeneity testing system and method based on a galvanometer. The testing system comprises a light source, a collimator, a diaphragm, an optical filter, the galvanometer and a computer. The galvanometer comprises two opposite reflectors. A computer is used for controlling the angles of the two reflectors so that the reflection angles of light beams passing through the reflectors can be controlled, the light beams reflected by one reflector scan in one direction, the scanning directions of the two reflectors are perpendicular to each other, and therefore two-dimensional scanning of the surface of a PMT can be finished through cooperation of the two reflectors. According to the system, no connecting lines exist in a light path, setting up is easy to carry out, and a position is easy to correct; the PMT is easy to replace, and the homogeneity of a large number of PMTs can be tested; the control precision of the galvanometer is high, precise displacement of the light beams on the PMT can be ensured, and each effective detection unit of the surface of the PMT can be traversed; by selecting different optical filter types, the system can be widely used for testing the homogeneity of the PMTs with different wave lengths.

Description

technical field [0001] The invention relates to nuclear medicine imaging equipment, in particular to a test system and a test method for the uniformity of a photomultiplier tube based on a vibrating mirror. Background technique [0002] Photomultiplier tube PMT is a photoelectric conversion device that can convert weak light signals into electrical signals that are easy to collect and process. The photomultiplier tube consists of a photocathode (photoelectric emission cathode), a focusing electrode, an electron multiplier, and an anode (electron collector). A scintillator is combined with a photomultiplier tube to form a scintillation detector. Scintillation detectors are used in nuclear medicine equipment such as positron emission tomography PET equipment. Gamma gamma rays hit the scintillator to generate scintillation light, which enters the photomultiplier tube through the optical window and emits photoelectrons on the photocathode; The electric field of the electrode e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84
Inventor 任秋实杨昆李素莹谢肇恒刘琪刘曦张秋实卢闫晔周坤
Owner PEKING UNIV
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