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CN-121995508-A - Muon imaging detection system and muon imaging detection method based on scintillation optical fiber and SiPM readout

CN121995508ACN 121995508 ACN121995508 ACN 121995508ACN-121995508-A

Abstract

The invention discloses a muon imaging detection system and method based on scintillation fiber and SiPM readout. The device comprises at least one detection unit, a signal processing unit and a positioning reconstruction unit, wherein the detection unit comprises a scintillation fiber array and an SiPM array carrier plate, the scintillation fiber array is formed by arranging a plurality of scintillation fibers in parallel, the SiPM array carrier plates are respectively arranged at two ends of the scintillation fiber array carrier plates, the SiPM arrays are integrated on the SiPM array carrier plates, the SiPM units are the same as the scintillation fibers in number and correspond to one another, the SiPM units are optically coupled with one ends of corresponding scintillation fiber signals, receive scintillation optical signals transmitted in the corresponding scintillation fibers and generate electric signals, the signal processing unit is used for preprocessing the electric signals output by the SiPM to obtain processed signals, and the positioning reconstruction unit is used for reconstructing spatial movement tracks of the muxes according to the processed signals. The invention can realize the three-dimensional high-precision positioning and track reconstruction of muon and has the advantages of high integration level, modularized design and the like.

Inventors

  • Zhong tiancheng

Assignees

  • 浙江大学计算机创新技术研究院

Dates

Publication Date
20260508
Application Date
20260127

Claims (10)

  1. 1. A muon imaging detection system based on scintillating fiber optics and SiPM readout, comprising: The detection unit comprises a scintillation fiber array and an SiPM array carrier plate, wherein the scintillation fiber array is formed by arranging a plurality of scintillation fibers in parallel, two ends of the scintillation fiber array are respectively provided with an SiPM array carrier plate, each SiPM array carrier plate is integrated with an SiPM array, the SiPM units in the SiPM array are the same in number and correspond to the scintillation fibers one by one, and the SiPM units are optically coupled with one ends of corresponding scintillation fiber signals, receive the scintillation light signals transmitted in the corresponding scintillation fibers and generate electric signals; the signal processing unit is used for preprocessing the electrical signal output by the SiPM to obtain a processed signal; And the positioning reconstruction unit is used for reconstructing the spatial motion track of the muon according to the processed signals.
  2. 2. The muon imaging detection system based on scintillating fibers and SiPM readout of claim 1, wherein said scintillating fibers are arranged in concentric multiple layers in a scintillating fiber array of said detection unit.
  3. 3. The muon imaging detection system based on scintillating fibers and SiPM readout of claim 2, wherein said scintillating fibers are arranged in concentric annular arrays with a radius of adjacent rings increasing by a fixed factor.
  4. 4. The muon imaging detection system based on scintillating fiber and SiPM readout of claim 1, wherein the signal processing units comprise front-end signal processing modules, each SiPM unit is in signal connection with an independent input end of the front-end signal processing module, and the front-end signal processing module is used for amplifying, shaping and/or timing discrimination of the electrical signals output by the SiPM units, and synchronously measuring time information and charge information.
  5. 5. The muon imaging detection system based on scintillating fiber and SiPM readout according to claim 4, wherein the front-end signal processing module comprises a front-end signal processing chip, the positioning reconstruction unit comprises an FPGA control module, and processed signals output by the front-end signal processing chip are transmitted to the FPGA control module through a high-speed differential interface to perform data caching, trigger judgment and time stamping.
  6. 6. The system for detecting the muon imaging based on the scintillation fiber and the SiPM readout according to claim 1, wherein for each hit, the positioning reconstruction unit determines the hit position of the muon in the transverse direction by detecting the serial number of the triggered scintillation fiber with the axial direction of the scintillation fiber as the longitudinal direction and the radial direction as the transverse direction, and meanwhile, the time difference and the light intensity difference of SiPM output signals at two ends of the scintillation fiber are utilized to reversely calculate the hit coordinates of the muon in the longitudinal direction, so as to obtain the three-dimensional hit coordinates corresponding to the triggered scintillation fiber.
  7. 7. The muon imaging detection system based on scintillating fibers and SiPM readout of claim 6, wherein for each traversing event, the positioning reconstruction unit performs fitting processing on three-dimensional hit coordinates corresponding to all triggered scintillating fibers, and then reconstructs a spatial motion track of muon.
  8. 8. The muon imaging detection system based on scintillating fiber and SiPM readout according to claim 1 or 7, wherein in the positioning reconstruction unit, the reconstruction result is obtained by reconstructing the underground medium density distribution and/or the geological structure through a muon imaging inversion algorithm according to the spatial motion track of the muon in at least one traversing event.
  9. 9. A method of muon imaging detection employing a muon imaging detection system as claimed in any one of claims 1 to 8, comprising the steps of: the signal processing unit is used for reading and processing the electric signals output by the SiPM units at the two ends of each scintillation optical fiber, and generating processed signals; identifying a single hit and triggered scintillation optical fiber according to the time domain processed signals corresponding to each SiPM unit by using a coupling time window method, and marking each hit related in time as the same crossing event; For each hit, obtaining a corresponding three-dimensional hit coordinate according to the number of the triggered scintillation optical fiber, the time difference and the light intensity difference of the SiPM output signals at the two ends; for each crossing event, the positioning reconstruction unit performs fitting processing on the three-dimensional hit coordinates corresponding to all triggered scintillation optical fibers, and then reconstructs to obtain a spatial motion track of the muon.
  10. 10. The muon imaging detection method according to claim 9, further comprising the step of reconstructing the underground medium density distribution and/or the geological structure by a muon imaging inversion algorithm according to the spatial motion trail of the muon in at least one traversing event to obtain a reconstruction result.

Description

Muon imaging detection system and muon imaging detection method based on scintillation optical fiber and SiPM readout Technical Field The invention belongs to the technical field of cosmic ray muon detection and underground geological imaging, and relates to a three-dimensional detection system combining scintillation optical fibers and SiPM and a signal processing method. Background The cosmic ray muon imaging technology is an advanced means for carrying out nondestructive detection on a large-scale target or underground medium by utilizing the penetrating capability of high-energy muon, and is widely focused in the fields of mineral resource exploration, mineral spatial distribution identification, underground cavity detection, tunnel safety assessment, volcanic structure imaging and the like in recent years. The existing muon detection system mostly adopts a gas detector as a core sensitive unit, such as GEM (Gas Electron Multiplier), MWPC, a drift chamber and the like, and the detector generates signals through ionized gas and amplifies the signals to measure muon tracks. However, the gas detector has the problems of complex structure, continuous gas supply, high working pressure, high requirements on tightness and environmental stability and the like, and particularly has difficult system maintenance and insufficient long-term operation reliability when being used in an underground mine or a severe environment, thereby severely restricting the engineering application and popularization of the gas detector. For the above problems, some patents and researches have been tried to develop muon detection by combining a scintillator with a photomultiplier, for example, plastic scintillators are used to match vacuum photomultiplier PMT or silicon photomultiplier SiPM to realize muon detection, but such schemes have limited spatial resolution, and the detection unit has a large volume, which is not beneficial to constructing a high-precision and modularized three-dimensional imaging system. Meanwhile, the scheme of a strip scintillator or an optical fiber structure is partially adopted, so that the problems of complex signal reading channels, insufficient time sequence precision, obvious temperature drift influence and the like still exist in the underground muon imaging application in the particle physical experiment or medical imaging field. Therefore, a novel muon detection technology which has a simple structure, does not need a gas system, has high stability and is suitable for a complex underground environment is urgently needed, so that the reliability, maintainability and space imaging precision of a muon imaging system are improved, and a more efficient and practical technical means is provided for mineral exploration and underground structure detection. Disclosure of Invention The invention provides a muon imaging detection system and method based on scintillation optical fiber and SiPM readout, which are used for solving the problems of complex structure, ventilation and high pressure, poor underground environment adaptability, high stability and maintenance cost and the like of the existing muon imaging system based on a gas detector. The cosmic ray muon three-dimensional track detection system based on the scintillating fiber array and the SiPM array and the data processing method thereof realize Miao Zigao-precision three-dimensional imaging which does not need a gas medium, has a compact structure, is stable and reliable, and is suitable for underground mineral exploration and geological structure reconstruction. The technical scheme adopted by the invention comprises the following contents: 1. muon imaging detection system based on scintillation optical fiber and SiPM readout The muon imaging detection system comprises: The detection unit comprises a scintillation fiber array and an SiPM array carrier plate, wherein the scintillation fiber array is formed by arranging a plurality of scintillation fibers in parallel, two ends of the scintillation fiber array are respectively provided with an SiPM array carrier plate, each SiPM array carrier plate is integrated with an SiPM array, the SiPM units in the SiPM array are the same in number and correspond to the scintillation fibers one by one, and the SiPM units are optically coupled with one ends of corresponding scintillation fiber signals, receive the scintillation light signals transmitted in the corresponding scintillation fibers and generate electric signals; the signal processing unit is used for preprocessing the electrical signal output by the SiPM to obtain a processed signal; And the positioning reconstruction unit is used for reconstructing the spatial motion track of the muon according to the processed signals. In the scintillation fiber array of the detection unit, the scintillation fibers are concentrically arranged in multiple layers. The scintillating fibers are arranged in a concentric annular array, and the radius of adjacent rings