| US 7,552,017 B1 | ||
| Tailpulse signal generator | ||
| John Baker, Walnut Creek, Calif. (US); Daniel E. Archer, Knoxville, Tenn. (US); Stanley John Luke, Pleasanton, Calif. (US); Daniel J. Decman, Livermore, Calif. (US); and Gregory K. White, Livermore, Calif. (US) | ||
| Assigned to Lawrence Livermore National Security, LLC, Livermore, Calif. (US) | ||
| Filed on Oct. 06, 2006, as Appl. No. 11/544,146. | ||
| Claims priority of provisional application 60/725128, filed on Oct. 06, 2005. | ||
| Int. Cl. G01R 13/00 (2006.01) | ||
| U.S. Cl. 702—66 [250/252.1] | 8 Claims |
| 1. A tailpulse signal generator comprising:
digital signal processor (DSP) for generating digital tailpulse signals from gamma energy spectrum data, said DSP adapted
to: pseudo-randomly select energy values from the spectrum data and pseudo-randomly select pulse time intervals; produce digital
pulse amplitude values corresponding to the number of events at the selected energy values and at the selected time intervals;
exponentially decay the pulse amplitude values in time; at each selected time interval, add a new pulse amplitude value to
an old exponentially decaying amplitude pulse value; and exponentially decay the resulting pulse amplitude value in time to
simulate the pileup effect;
a digital-to-analog converter (DAC) operably connected to receive said digital tailpulse signals from said DSP and produce
analog voltage signals therefrom to simulate tailpulses characteristic of the gamma energy spectrum; and
means for supplying power to said tailpulse signal generator.
|