Ruprecht-Karls-Universit¨at Heidelberg, 2003. 52 p. (на английском языке)
Die Diplomarbeit wurde von ausgef¨uhrt am Physikalischen Institut HeidelbergFast dynamic radiography at a high-flux ther-mal neutron beam We report on first dynamic radiographies with millisecond time resolution measured at the new neutron radiography and tomography facility Neutrograph at the Institut Laue-Langevin (ILL) in Grenoble (France). We visualized the fuel jet from a diesel direct injection nozzle and recorded dynamic radiographies of a running combustion engine and an externally driven car engine. Further measurements included two-phase flow of pentane in a thin heated steel pipe, water penetration in building materials, and water transport into a lecithin lamellar phase. We put Neutrograph into operation at the ILL beamline H
9. It provides the high thermal flux of 2.9×109 n cm−2 s−1 and the sufficiently low divergence of 6 mrad that permit fast dynamic radiography with sub-millimeter resolution. The properties of Neutrograph are discussed, especially those of the detector.Introduction
Basics of Neutron Radiography
Measuring Principle
Tomography
Comparison with other Methods
Beam and Detector
The Beam
The Detector
The Scintillator
The Camera
The Detector Housing
The Casemate
Radiation Protection
Safety
Error Analysis
Systematic Errors
Scintillator Degradation
Intensity Fluctuations
Statistical Errors .
Contrast
Spatial Resolution
Time Resolution
Image Intensifiers
Data Treatment
Measurements
Combustion Engines
Introduction
Injection Nozzle
Running Engine
Car Engine
Further Measurements
Two-Phase Flow
Building Materials
Myelin
Outlook
A Derivations
Bibliography
Acknowledgements
Declaration
Instructions for the CD
