Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Patrice Ouvrier-Buffet

Jean-Pierre Rostaing

Guillaume Montemont

Caroline Paulus

Loïck Verger

Patrick Villard

Anne Ghis

Olivier Billoint

Francis Glasser

Veronique Rebuffel

Jean Rinkel

Andrea Brambilla

Jean Du Port De Poncharra

Guillaume Beldjoudi

Nathalie Rolland

Jacques Rustique

Véronique Rebuffel

Ken-Ji De La Rosa

Marc Accensi

Aziz Benlarbi-Delai

Andréa Brambilla

A circuit for counting photons, including: an input terminal intended to be connected to a detector of ionising radiation; an analogue stage for generating a pulsed signal, each pulse of which has an amplitude proportional to the energy released by an interaction of at least one photon in the detector; and a digital stage including: at least one first comparator for comparing the amplitude of the pulses to a first threshold; a differentiator circuit for determining periods in which the derivative of the pulse signal is of a given sign; at least one first logic gate for combining the outputs of the first comparator and the differentiator circuit; and at least one first counter for counting the number of pulses present on the output of the combining element.

Device for counting particles for a radiation detector

A method for characterizing nature of a material, including: providing at least one sample of the material between an X-ray source and a detector; using the X-ray source to make N X-radiation spectra transmitted through the material, each for a time; calculating transmission function of the material as a function of energy or the detection channel; and in each of at least two energy zones, calculating the integral of the transmission function, thus forming at least a first transmission coefficient and a second transmission coefficient.

Method and device for recognition of a material making use of its transmission function

An electronic device to simply and efficiently measure energy of incident photons in a very short time and with a very high count rate and high precision, starting from current pulses from an ionizing electromagnetic radiation detector, the electronic device including an analog delay line with switched capacitors with controlled loss at an output from a charge preamplifier.

Device for converting current pulses into voltage pulses

A device that processes a signal delivered by a radiation detector includes a circuit that delivers a voltage pulse whose amplitude is proportional to a charge detected by the radiation detector. The device also includes an analog to digital converter to digitize the voltage pulse at a given sampling frequency and delivers a corresponding digital signal to a processing circuit. The processing circuit reads the digital signal, computes a temporal variation rate of the digital signal and captures the digital signal when the temporal variation reaches a threshold.

Device for processing a signal delivered by a radiation detector

An ionizing radiation detection device including a detector of semi-conductor material intended to be biased thanks to electrodes, among which reading electrodes connected to a reading circuit process signals they provide to reject those causing a poor spectrometric response, that is those affected by an induction share and possibly those affected by a charge or electronic noise share.

Ionizing radiation detection device with a semi-conductor detector having and improved spectrometric response

An integrated circuit intended to be assembled with an electromagnetic radiation detector, the integrated circuit comprising a device for processing signals stemming from the detector, the processing device being covered with at least one conductive plate for protection against electromagnetic radiation, intended to be placed between said detector and said integrated circuit, said conductive plate including one or more apertures letting through conductive elements providing an electrical connection between the processing device and the detector.

Electromagnetic coupling device of an electromagnetic radiation detector

This device for processing and digitizing an energy spectrum of a radiation, comprises a charge preamplification circuit of the integrating circuit type, suitable for being connected to a semiconductor detector; a lag line energy measurement circuit connected to the output of the preamplification circuit; and a sampler connected to the output of the energy measurement circuit. It further comprises a synchronization circuit a current pulse measurement circuit connected to the output of the preamplification circuit and calculating the difference between the output and a differential of the output of the preamplification circuit; and a discrimination circuit forming a binary signal according to the output of the pulse measurement circuit said logic signal controlling the sampling times of the sampler.

Device for processing and digitizing an energy spectrum of an electromagnetic radiation

A device for processing a signal (i) derived from a particular detector, the device including an integrator for measuring the total charge transported by an input signal (i) feeding the integrator for a predetermined time interval. The device further includes a plurality of units for receiving detector signal (i) derived from the particle detector, reducing the background noise present in the detector signal (i), and producing the input signal (i). The invention is applicable to various devices and appliances for measuring flow of particles such as photons.

Device for correcting a signal derived from a detector

An apparatus adapted to measure of current pulses that are very brief (a few nanoseconds) and of very low amplitude (a few microamps), such as those that can emanate from a photodetector used for the optical transmission of data at very high speed, or from a photodetector (photodiode or photoconductor) subject to a radiation that is of pulsed nature (in particular: X, gamma and other radiations). The circuit includes an integration stage (IT), a differentiation stage (DR), and a subtraction stage (SS). The time constants Rp.Cint and R.Cof the integration and differentiation stages are preferably equal.

Device for measuring very short current pulses

This is a processing circuit for a spectrometry chain including a particle radiation detector (), including a charge preamplifier stage () receiving a current (I) from the detector, representative of the amount of charges emitted by a particle which has interacted with the detector, and an integrator stage (). A differentiator stage () is connected between the charge preamplifier stage () and the integrator stage (), the differentiator stage () receiving a signal (V) from the charge preamplifier stage () and delivering to the integrator stage (), a signal (V), image of the detector current (I), the integrator stage () delivering, an image (V) of the amount of charges emitted by a particle which has interacted with the detector. Application notably to the high energy single channel probes.

Enhanced processing circuit for spectrometry system and spectrometry system using same

A method for exploiting a signal provided by a detector is disclosed. For one embodiment, the time spent by at least one part of the signal above a value Sof a first threshold is determined. The charge corresponding to the part of the signal during the time spent above the value Sof the first threshold is determined. A new value S'of the first threshold as a function of the charge and the time spent above the value Sof the first threshold is determined. The steps of determining the time spent by at least one part of the signal above a value Sof a first threshold and determining the charge corresponding to the part of the signal during the time spent above the value Sof the first threshold are reiterated at least once using the new value of the first threshold.

Spectra acquisition system with threshold adaptation integrator

A charge pump including n cells in series, each cell comprising a shift capacitor (Cdi) and a storage capacitor (Cmi), respectively having a shift parasitic capacitor (Cpi) and a storage parasitic capacitor (Cqi). The presence of the parasitic capacitors (Cpi, Cqi) leads to a loss of charge transmitted to the cell. Each cell comprises charge injection means (Cdinji, Cminji) for partially or totally compensating, or even overcompensating, the lost charge quantity. The charge pump may be implemented in silicon-on-insulator technology.

Charge pump with charge injection

A sampling device for high frequency signal that propagates in a propagation structure. The device comprises a first stage (AIC) to sample a first signal at a first time tand at least one second stage (AIC) in series with the first stage to take a second sample representative of the first sample, starting from the first sample, taken at a second time tgreater than t, the life-time of the second sample being longer than the life-time of the first sample.

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Saint-Jorioz, France

Patrice Ouvrier-Buffet