Advertisement

Neural Net Approaches for Event Location in the Detector Modules

  • A. Connors
  • H. Aarts
  • K. Bennett
  • A. Deerenberg
  • R. Diehl
  • J. W. den Herder
  • W. Hermsen
  • G. Lichti
  • J. Lockwood
  • M. Loomis
  • J. Macri
  • M. McConnell
  • D. Morris
  • K. Reinhard
  • J. Ryan
  • V. Schönfelder
  • G. Simpson
  • B. N. Swanenberg
  • H. Steinle
  • A. Strong
  • M. Varendorff
  • C. de Vries
  • W. E. Webber
  • C. Winkler
  • V. Zeitlmeyer
Part of the Ettore Majorana International Science Series book series (EMISS, volume 59)

Abstract

From the description of the Compton telescope given previously (Schönfelder et al., this volume), one can see that the accuracy with which one determines the position of a cosmic gamma-ray source depends not only on the measurements of the energy deposited in the upper (D1) and lower (D2) detectors, but also on how accurately one estimates the (X, Y, Z) positions of each gamma-ray or neutron interaction (an event). If nothing were known about the position of each event except in which module it occured, it would increase the uncertainty in the position of a source by on the order of 10°. Within each COMPTEL module, one extracts position information from comparisons of relative intensities of signals in the photomultipier tubes. This technique was introduced in the 1950’s for medical imaging by Anger (1958), and later was adapted to astrophysical applications (Zych et al. 1983; Schönfelder et al. 1984; Stacy 1985).

Keywords

Contour Plot Receptive Field Photomultiplier Tube Contour Interval Module Edge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Albus, J. S., 1972, Ph.D. Thesis, University of Maryland.Google Scholar
  2. Albus, J. S., 1975, J. Dyn. Sys., Meas., Contr., 97, 220.MATHCrossRefGoogle Scholar
  3. Anger, H. O., 1958, Rev. Sci. Instr.,, 29, 27.ADSCrossRefGoogle Scholar
  4. Bendellini, O., 1991 Ap. J., 366, 599.ADSCrossRefGoogle Scholar
  5. Clare, F., Kennison, D., and Lackman, R., 1987, NCAR Graphics User’s Guide,(National Center for Atmospheric Research: Boulder, Co).Google Scholar
  6. Engstrom, R. W., 1980, RCA Photomultiplier Handbook,(RCA Corporation Electro Optics and Devices: Lancaster, PA).Google Scholar
  7. Finger, M., 1987, Ph.D. Thesis, California Institute of Technology.Google Scholar
  8. IMSL 1987, User’s Manual: Math/Library Fortran Subroutines for Mathematical Applications. Google Scholar
  9. Freuder, R., 1991, private communication.Google Scholar
  10. Lampton, M., Margon, B.,and Bowyer, S., 1976, Astrophysical Journal, 208, 177.ADSCrossRefGoogle Scholar
  11. Loomis, M., 1991, U.R.O.P. Report, University of New Hampshire.Google Scholar
  12. McConnell, M., 1990, Comparisons of Neural Net vs Conventional Location Techniques,COM-TN-UNH-MMG-074.Google Scholar
  13. Miller, W. Thomas, Glanz, Filson H., and Kraft, L. Gordon, 1987, International Journal of Robotics Research, Vol. 6, No. 2, 84.CrossRefGoogle Scholar
  14. Miller, W. Thomas, Glanz, Filson H., and Kraft, L. Gordon, 1990, Proc. of the IEEE,Vol. 78, No. 10, 1561.CrossRefGoogle Scholar
  15. Poggio, T., and Girosi, F., 1990, Proc. of the IEEE, Vol. 78, No. 9, 1481.CrossRefGoogle Scholar
  16. Schönfelder, V., it et al., 1984, ISEE Trans. Nucl. Sci., NS-31, 766.ADSCrossRefGoogle Scholar
  17. Shafer, R. A., Haberl, F., Arnaud, K. A., 1990, XSPEC: An X—Ray Spectral Fitting Package User’s Guide, (EXOSAT Observatory: European Space Agency, Noordwijk).Google Scholar
  18. Stacy, J. G., 1985, Ph.D. Thesis, University of Maryland.Google Scholar
  19. Tennant, A. F., 1989 The QDP/PLT User’s Guide, (Space Science Laboratory: Marshall Space Flight Center).Google Scholar
  20. Reinhard, Kent, 1989, M.S. Thesis, University of New Hampshire.Google Scholar
  21. Varendorff, Martin, 1987, Diplomarbeit, MPE.Google Scholar
  22. Zeitlmeir, Valentine, 1988, Diplomarbeit, Augsburg.Google Scholar
  23. Zych, A. D., Turner, O. T., and Dayton, B., 1983, IEEE Trans. Nucl. Sci., NS-30, 383.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • A. Connors
    • 1
  • H. Aarts
    • 2
  • K. Bennett
    • 3
  • A. Deerenberg
    • 2
  • R. Diehl
    • 4
  • J. W. den Herder
    • 2
  • W. Hermsen
    • 2
  • G. Lichti
    • 4
  • J. Lockwood
    • 1
  • M. Loomis
    • 1
  • J. Macri
    • 1
  • M. McConnell
    • 1
  • D. Morris
    • 1
  • K. Reinhard
    • 1
  • J. Ryan
    • 1
  • V. Schönfelder
    • 4
  • G. Simpson
    • 1
  • B. N. Swanenberg
    • 2
  • H. Steinle
    • 4
  • A. Strong
    • 4
  • M. Varendorff
    • 4
  • C. de Vries
    • 2
  • W. E. Webber
    • 1
  • C. Winkler
    • 3
  • V. Zeitlmeyer
    • 4
  1. 1.University of New HampshireDurhamUSA
  2. 2.ROL - Laboratory for Space ResearchLeidenThe Netherlands
  3. 3.Space Science Dept. of ESAESTECNoordwijkThe Netherlands
  4. 4.Max-Planck Institut für Extraterrestrische PhysikGarchingGermany

Personalised recommendations