REAL TIME DIGITAL PULSE PROCESSING APPLIED TO HEAVY ION IRRADIATION

Cristian Zet, Cristian Fosalau, Lars Westerberg, Reimar Spohr

Abstract

Three algorithms for real-time digital pulse processing of fast detector signals (1 - 100 μs) are described and implemented through Field Programmable Gate Arrays (FPGAs). The signal from a PIN diode used as ion detector is amplified and digitized with a fast flash ADC at a rate of 10 MHz/s. Whenever a preset threshold is exceeded, an event is detected. The pulse maximum is determined using one of the three methods, characterized by decreasing response times and increasing the result confidence degree: (1) searching for the maximum, (2) integrating the signal and (3) looking for the derivative sign. The system is applied to fabricate polymer films with a preset number of ion hits at preset distances. The technique can be generalized to real-time processing of pulsed signals from arbitrary sensors and transducers.

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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