Commissariat a L'energie Atomique

Eric Barat

Jean-Christophe Trama

Thomas Dautremer

Alain Bourgerette

Thomas Brisset

Luc Eglin

Thomas Trigano

Andre Salles

A method for processing a noisy digital time signal yof digital pitch k, corresponding to an initial analogue signal safter being conditioned by a conditioning chain. The initial analogue signal sincludes at least one pulse representing information concerning at least one radiation from a radiation source, the radiation and the pulse having an energy distribution. The method includes the determination of a non-noisy digital estimation signal sfrom the noisy time signal yby using a state model representing the conditioning imposed by the conditioning chain and in that the state model includes a Markovian variable rto be estimated whereof at least two values are associated with physical characteristics of at least two typical pulses constituting a possible representation, at least approximate, of the pulse in the signal s.

Processing of a signal representing radiation

The invention proposes a method of processing a noisy digital time signal ycorresponding to an initial time signal xafter having been conditioned by a conditioning chain, the said initial signal xrepresenting information about radiations coming from a radiation source, these radiations having an energy distribution, characterised in that a state model is implemented, representing the conditioning imposed by the said chain to pass from the initial time signal xto the noisy digital time signal yin order to obtain from the noisy digital time signal ya non-noisy digital estimate signal of the initial time signal x. The invention furthermore proposes a system capable of implementing said method.

The invention relates to a method of measurement, comprising treatment of a signal consisting of a succession of temporally spaced main pulses, having a duration D and energy E, which can each consist of a stack of elementary pulses having a duration Di and whose energy is evaluated by a variable Ei having an additivity property, wherein said elementary pulses have instants of appearance Ti following a homogeneous Poisson process of an intensity &#x3bb;, characterized in that said method comprises the following steps: digitization of the signal; measurement of the duration D and energy E for each main pulse in order to create duration-energy pairs (D,E); determination of the energy pairs (Di,Ei) of the elementary pulses from the constructed pairs (D, E); deduction of energy Ei of each elementary pulse from the determined pairs (Di,Ei). The invention also relates to a signal analysis device comprising means which can implement the method according to the invention.

Measurement and treatment of a signal comprising stacks of elementary pulses

System and method for validating the signal for detecting a measuring chain with a wide band of nuclear radiations. This system for validating the signal of a measuring chain of nuclear radiations (1), includes a detector (10) able to deliver a wide spectral band signal to at least one processing unit (12, 14) and is characterized in that the system (30) includes means (32) for copying the detection system so as to deliver a copy of this signal to a calculation unit (34), the calculation unit (34) being able to calculate measuring spectral information representative of the spectrum of the detection signal and compare this information with reference spectral information. The system and method are applicable to chains for counting in fluctuations or pluses.

System and method for validating the detection signal of a measuring

Method and its devices for the contactless measurement of the tension and/or travel speed of an insulating filament, thread or wire. The method consists of processing the signal ##EQU1## in which C1 and C2 are the capacitances of a capacitive dipole. For the filament tension measuring device, the dipole (3) is defined by a pair of electrodes (4a/4b) of the same size and having a triangular shape and by a common electrode (2), processing consisting of extracting the vibration frequency of the filament between two supports by a spectral analysis. The speed measuring device comprises two dipoles (13,17), each defined by a pair of rectangular electrodes (14a/14b, 18a/18b) and a common electrode (12,16), processing consisting of extracting the passage time, between the two dipoles, of microscopic irregularities of the filament by an intercorrelation. The invention has application to the textiles field and particularly to the spinning of textile filaments.

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Limours en Hurepoix, France

Eric Barat