A Random Pulse Generator for Simulating Nuclear Radiation Signals

Abstract

According to the statistical properties of the nuclear signal pulse on the amplitude and time, a random pulse generator for simulating nuclear radiation signals is designed in this paper. The noise of the ADC acquisition circuit is used to obtain two-way seeds of random number. The obtained seeds of random number are processed by linear feedback shift register (LFSR) to generate high-speed and uniformly distributed random number continuously, then random numbers of Gaussian distribution are produced based on lookup table method and random numbers of exponential distribution are produced by setting the threshold value. Random numbers of Gaussian distribution are sent to the D/A converter to convert digital signal to analog signal, and random numbers of exponential distribution are sent to control time interval between two pulse signals. Eventually the random pulse that follows the gauss distribution on the amplitude and the exponential distribution on the time interval between two adjacent pulse signals is shaped by pulse shaped circuit. The practical test results show that the random pulse follows the gauss distribution on the amplitude and the exponential distribution on the time interval between two adjacent pulse signals, meeting statistical regularity of nuclear signal.