Digitalno upravljanje bankom rekurzivnih filtara u optimizaciji obrade signala sa impulsnih detektora zračenja u nuklearnoj instrumentaciji
Digital Control of a Bank of Recursive Filters in Optimal Processing of Signals from Pulse Radiation Detectors in Nuclear Instrumentation
Doctoral thesis (Published version)
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New algorithm for measurement of mean count rate of pulses from radiation detectors is described. The algorithm is based on the control of a bank of digital IIR filters governed by the state of mean count rate - stationary or transient. The algorithm solves successfully the compromise between the contradictory requirements for low statistical fluctuations in steady state and fast response to sudden changes of mean count rate. The design of the bank of IIR filters is carried out by using the Chebyshev approximation of the second kind in order to achieve the high selectivity and high stop-band attenuation applying as low as possible order of the constituent filters. All designed filters are of the second order. The static and dynamic characteristics of the new algorithm and the corresponding computational efficiency are tested and compared with those of the traditional rate-meter algorithms. The responses of the algorithm to linearly growing mean count rate and its sensitivity to variat...ions of mean count rate have also been examined. The state of mean count rate, stationary or transient, is determined by a circuit for estimation of the gradient of mean count rate. The numbers of threshold levels within the adaptation logic circuit and their mutual positions have been optimized to achieve the best compromise. Stability of the algorithm is tested numerically by computer simulations and verified experimentally. A mean count rate meter based on the described algorithm has been designed and successfully realized.
Keywords:detektori nuklearnih čestica / obrada signala / algoritam AIIR
- Univerzitet u Beogradu, Elektrotehnički fakultet