Alpha track counting in LR-115 nuclear detector with optical Fourier digital system

摘要

An optical Fourier system comprising two Fourier lenses arranged in a 4 ― f configuration, a CCD camera coupled to an Analogue Digital (A/D) converter and interfaced to a computer, has been found effective to image and discriminate real etched alpha tracks and artifacts on LR-115. The choice of the optical components enhanced the system's sensitivity and the field of view of detector area (1.4 cm~2). The use of spatial filters in the Fourier plane deforms the tracks and introduces phase variation of the Fourier transform signal. In addition narrow bandwidth filters could not cover broader range of all the tracks. Image analysis before track counting improves signals to noise ratio and increase the selectivity of the tracks signal size. The system can handle higher track density and other types track detectors.