By Scott R Craven

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Proc. Symp. Modern Optics, Polytechnic Press Brooklyn, New York, 787 16. , et al. 1984, in M. Oda, R. ), X-Ray Astronomy ’84, Institute of Space and Astronautical Science, Tokyo, 313 17. Rideout, R. 1995, Coded Imaging Systems for X-ray Astronomy, PhD Thesis, Univ. of Birmingham 18. , et al. 1996, Astrophys. , 496, 538 19. , et al. 1968, Space Sci. , 8, 534 20. , 1972, Scientific American, 27 21. K. 1995, in L. Bassani, G. ), Imaging in High Energy Astronomy, Kluwer, Dordecht, 1 22. M. 1995, in L.

1998, Astrophys. J. 496, 538 4 Imaging Proportional Counters E. 1 Introduction The sensitivity of astronomical observations in the soft X-ray band has been increased dramatically by the use of imaging optics and position sensitive focal plane detectors. The tremendous sensitivity increase of imaging telescopes compared with detectors with mechanical collimators has two reasons. The effective collecting area of the telescope is determined by the sensitive area of the mirror system and not any more by the area of the detector.

The amplitude of the peak/rings is a measure of the source flux. Multiple sources can easily be imaged simultaneously and the position and flux of each individual source can be determined. Image imperfections like ghost peaks can be avoided by shifting the grid patterns against each other (by d/2) and by placing the rotation axis at the edge of the desired FOV [24]. 2 Spatial Aperture Modulation The alternative to the temporal aperture modulation is the spatial aperture modulation. It requires two-dimensional position sensitive detectors.

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Protecting gardens and landscape plantings from rabbits by Scott R Craven

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