Coded aperture imaging system for nuclear fuel motion detection
A Coded Aperature Imaging System (CAIS) has been developed at Sandia National Laboratories to image the motion of nuclear fuel rods undergoing tests simulating accident conditions within a liquid metal fast breeder reactor. The tests require that the motion of the test fuel be monitored while it is immersed in a liquid sodium coolant precluding the use of normal optical means of imaging. However, using the fission gamma rays emitted by the fuel itself and coded aperture techniques, images with 1.5 mm radial and 5 mm axial resolution have been attained. Using an electro-optical detection system coupled to a high speed motion picture camera a time resolution of one millisecond can be achieved. This paper will discuss the application of coded aperture imaging to the problem, including the design of the one-dimensional Fresnel zone plate apertures used and the special problems arising from the reactor environment and use of high energy gamma ray photons to form the coded image. Also to be discussed will be the reconstruction techniques employed and the effect of various noise sources on system performance. Finally, some experimental results obtained using the system will be presented.
- Research Organization:
- Sandia Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 5293845
- Report Number(s):
- SAND-80-0026; CONF-800453-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210500 -- Power Reactors
Breeding
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900 -- Nuclear Reactor Technology-- Reactor Safety
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACCIDENTS
ALARM SYSTEMS
ALKALI METALS
APERTURES
BREEDER REACTORS
CAMERAS
DESIGN
ELECTROMAGNETIC RADIATION
ELEMENTS
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FLUIDS
FRESNEL LENS
FUEL ELEMENTS
FUEL RODS
GAMMA RADIATION
IONIZING RADIATIONS
LENSES
LIQUID METAL COOLED REACTORS
LIQUID METALS
LIQUIDS
LMFBR TYPE REACTORS
METALS
MONITORING
MOTION
MOTION DETECTION SYSTEMS
OPENINGS
RADIATIONS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTORS
RESOLUTION
SIMULATION
SODIUM
TIME RESOLUTION
TIMING PROPERTIES