Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (6): 60403-060403.doi: 10.11889/j.0253-3219.2015.hjs.38.060403


Baseline estimation method of digital multi-channel pulse height analyzer based on FPGA

LI Weinan YANG Chaowen ZHOU Rong   

  1. (College of Physical Science and Technology, Sichuan University, Chengdu 610064, China)
  • Received:2015-02-13 Revised:2015-03-25 Online:2015-06-10 Published:2015-06-05

Abstract: Background: Histogram statistics method and average value method are widely used to obtain the baseline of nuclear signal processing. However, there still exist several shortcomings, such as low accuracy, weak real-time character and high hardware resource occupancy. Purpose: This study aims to improve the accuracy and the real-time performance of the baseline extraction for the digital nuclear instruments. Methods: A novel method of obtaining baseline is proposed, it is a real-time dynamic average method that can be easily implemented on a Field-Programmable Gate Array (FPGA) based multi-channel pulse height analyzer. By setting appropiate parameters, the accuracy and real-time character could be obviously improved. Results: This novel method not only occupies less hardware resource, but also achieves higher accuracy. The energy resolution of 137Cs spectrum is got improved to 7.44%. Conclusion: This method can be applied to extract baseline of digital multi-channel pulse height analyzer with high accuracy and real-time response.

Key words: DCMA, Estimate baseline, High counting rate, High sensitivity, Energy resolution