A Comparison of Digital Signal Extraction Techniques

Cunningham, M ; Dowla, F

Lawrence Livermore National Laboratory

关键词: Probability;    46 Instrumentation Related To Nuclear Science And Technology;    Photons;    Detection;    Automobiles;   

DOI  :  10.2172/15011424
RP-ID  :  UCRL-TR-208848
RP-ID  :  W-7405-ENG-48
RP-ID  :  15011424

美国|英语

来源: UNT Digital Library

【 摘 要 】

We compare the performance of two methods of digital filtering to detect a radioactive source moving past a gamma-ray sensor. The first method is the box-car filter, which is a standard method used in the detection of a moving radioactive source. The second method is the matched filter, which takes into account the variation in the number of photons absorbed in a gamma-ray sensor as a source moves past the sensor. We optimize both methods to detect a source moving at 5, 10, 15 and 20 mph, and the receiver-operator characteristics of the two techniques are plotted for comparison. The improvement of the matched filter over the box car filter is 27% at 5 mph and 22% at 10 mph for a 90% probability of detection and an average hours between false alarms equal to 10.