Asynchronous digitisation of transient signals from radiation detectors
First Claim
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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, anda 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.
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Abstract
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.
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Citations
20 Claims
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1. A device for digitising a detection signal from an ionising electromagnetic radiation detector comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for digitising a detection signal from an ionising electromagnetic radiation detector, comprising steps of:
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comparing a first detection signal from said detector in the form of at least one pulse and a second signal, and delivering, based on this comparison, a two-state output signal, controlling said second signal based on said 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, estimating a value of said second signal using switching times of said comparator output signal and smoothing filter parameters, storing the comparator switching times in memory, and storing one of the estimation values of the second signal in memory.
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12. A device for digitising a detection signal from an ionising electromagnetic radiation detector comprising:
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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, wherein the estimation device is in the form of a digital, FPGA, or microprocessor, or ASIC circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification