Dissertation > Excellent graduate degree dissertation topics show

Study of CZT Pixel Arrays Nuclear Detector and Design of Electronics

Author: CaiXin
Tutor: XiaoShaLi
School: Chongqing University
Course: Instrument Science and Technology
Keywords: CZT Semiconductor detector Signal readout circuit Imaging system
CLC: TL814
Type: Master's thesis
Year: 2011
Downloads: 195
Quote: 0
Read: Download Dissertation

Abstract


CdZnTe（CZT） is a new developing compound semiconductor, and has been regarded as leading materials for room temperature nuclear radiation detectors. CZT nuclear radiation detectors have been widely utilized as X-ray andγ-ray telescopes and imaging instruments due to its high energy resolution, high detection efficiency and little bulk. Therefore, it has been a choice for many applications in the field of national security, astrophysics, environmental monitoring and medicine imaging system. In recent years, there is a rapid rise of attention for the investigation of CZT pixel arrays detector. And then, the research of CZT pixel arrays detector becomes a very hot issue on the radiation detection field.This paper analyzes and summarizes the recent achievement of scholars in and abroad for the CZT nuclear detection. The CZT pixel arrays nuclear radiation detection is studied in detail and the main research work is summarized as follows: Firstly, it has been studied the CZT pixel arrays nuclear radiation detector and has analyzed the characteristic of CZT crystal and the principle of CZT detector. Then, the fabrications of various parts of the system are also discussed. Secondly, the readout circuit especially for the CZT pixel arrays detector is presented in detail. The charge sensitive preamplifier is determined based on the requirement of the system characteristic and detector parameters. The designment of the shaper amplifier is accomplished based on the analysis of the preamplifier signal characteristic. The shaper amplifier is comprised of the amplification, the pole-zero cancellation, the DC offset adjust, Sallen-Key filter, 50Ωline driver and power supply filtering. In order to meet the requirement of CZT detector system, experimental results show that the shaper amplifier is to turn irregular pulse signals to standard quasi-gauss pulse signals. The simulation result of this circuit is in good accordance with the experimental result.Thirdly, the performance of the detector imaging system which includes the energy resolution and the peak efficiency has been also tested by using 662 keV Cs137 gamma source. Experimental results show that the energy resolution of the CZT pixel arrays detector system distributes in the range of 6.25% and 7.50% for Cs137. The photon peak efficiency which centers at about 67.5% mainly distributes between 65.0% and 72.5%. The performance of the detector imaging system meets the imaging requirements.Fourthly, the imaging experiment with a circular Cs137gamma source has been accomplished, meanwhile in order to evaluate the imaging system, modulation transfer function has been tested. Experimental results indicate that the source image can be obtained accurately, although there is lateral spread distribution which reduces from the noise.Lastly, the Lucy-Richardson algorithm, which has been also compared and analyzed, is adopted to restore the image degraded. The algorithm can properly retrieve various kinds of edges. Inner area spatial resolution has been obviously. The estimated source diameter has an error of 0.5 mm.

Related Dissertations

  1. Gui Design and Application Oriented to Embedded Ultrasonic Detecting System,TP274.53
  2. Scene Modeling for Simulation of Hyperspectral Remote Sensing System,TP72
  3. Front-end Circuit Design and Research in the AD9273-based All Digital B-mode Medical Imaging System,TP391.41
  4. The Analysis of Dynamic Changes of Forest Landscape in the Core Region of Chang-Zhu-Tan,S731.2
  5. The Study on Financial Support Strategy of CZT City Cluster’s Two-oriented Economy Development,F127;F224
  6. Study on Landscape Pattern of Agroforestry Ecosystem in the Region of Changzhutan,S181
  7. A Study on the Characteristics of New Regional Architecture in CZT (Chang Zhutan District),TU-86
  8. Study on the Construction of Ecological Civilization in CZT,X2
  9. A Study on Changzhutan City Cluster Low-carbon Economic Development Model, Approach and Policy,F205
  10. Research on the Online Measurement of Automobile Engine Speed Based on Vibration Analysis,U467.4
  11. HWECdZnTe / Si and characterization of thin film materials,O484.1
  12. Study of A Readout Circuit for CZT Surface Element Pixel Arrays Nuclear Radiation Detector,TL822
  13. Micro fiber Fabry-Perot interferometer demodulation method and application,TH741.13
  14. Research on Environmental Carrying Capacity Evaluation of CZT City-Cluster,C912.81
  15. The Research on Current Usage of Public Gymnasiums of "Chang-Zhu-Tan Economic Zone"Metropolis Circle and Corresponding Countermeasures of the Development,G812.7
  16. Design and Research on EAST Hard X-ray Diagnosis Apparatus and Its Hydraulic Power Support,TL651
  17. A Research about the Reform of the Land Rent Fees Tax and Tees System in CZT Experimental Area,F812.0
  18. Study on the Ecosystem Carrying Capacity of "Chang Zhu Tan 3+5" Cities,F205
  19. Study on the Beamforming Simulation and GUI Design for the Underwater Targets 3-D Imaging,TP391.41
  20. Study on Time Delay Estimation of Narrow-band Signals in Wireless Passive Position,TN95

CLC: > Industrial Technology > Nuclear technology > Particle detection,radiation detection and nuclear instrumentation > Radiation detection technology and instrumentation > Semiconductor detector ( crystal detector )
© 2012 www.DissertationTopic.Net  Mobile