Asynchronous digitisation of transient signals from radiation detectors

摘要

A device for sampling or digitising a detection signal from an X-or gamma-ray detector wherein, during a sampling time, estimations of a feedback signal are made at times when the signal injected to the inverting input of a comparator is equal to the detection signal at the non-inverting input of said comparator.

主权项

1. A device for digitising a detection signal from an ionising electromagnetic radiation detector comprising:
a comparator for receiving, on a first of the inputs thereof, a first detection signal from said detector in the form of at least one pulse, and delivering, based on a comparison with a second signal applied to a second of the inputs thereof, a two-state output signal, a control device acting as a feedback loop controlling said second signal based on the output signal of said comparator, such that the direction of variation of said second signal is dependent on the state of said output signal of said comparator , the control device comprising a smoothing filter having given parameters, an estimation device for estimating the second signal using switching times of said output signal of the comparator and said given parameters of said smoothing filter, the device for digitizing further comprising: a storing device for storing said comparator switching times in memory, and a device for storing values of a discrete signal generated by said estimation device in memory, the digitisation being performed based on said values of said discrete signal.