Coded Aperture Imaging System For Nuclear Fuel Motion Detection

K. T. Stalker; J. G. Kelly

doi:10.1117/12.958856

22 August 1980 Coded Aperture Imaging System For Nuclear Fuel Motion Detection

K. T. Stalker, J. G. Kelly

Proceedings Volume 0231, 1980 Intl Optical Computing Conf I; (1980) https://doi.org/10.1117/12.958856
Event: 1980 Technical Symposium East, 1980, Washington, D.C., United States

Abstract

A Coded Aperture 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.

Citation Download Citation

K. T. Stalker and J. G. Kelly "Coded Aperture Imaging System For Nuclear Fuel Motion Detection", Proc. SPIE 0231, 1980 Intl Optical Computing Conf I, (22 August 1980); https://doi.org/10.1117/12.958856

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