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

Commissariat a L'energie Atomique

Josy Cohen

Nicolas Gregis

Nicolas Ravot

Laurent Sommervogel

Jean-Marc Armani

Pascal Chambaud

Louise Revault

A method for detecting a random transition in a conducting line, includes the steps of: making a first reference reflectometry measurement on the conducting line in order to deduce a reference time-domain reflectogram therefrom, identifying at least one characteristic of the reference time-domain reflectogram, making a second reflectometry measurement on the conducting line to obtain a second time-domain reflectogram, identifying the same at least one characteristic in the second time-domain reflectogram, and for each amplitude peak identified, determining a difference between the at least one characteristic measured on the reference time-domain reflectogram and the same characteristic measured on the second time-domain reflectogram, evaluating, from a plurality of successive measurements, whether the difference increases in absolute value, and, if this is the case, triggering a warning corresponding to the appearance of a random transition.

Method for detecting a random state transition in a conducting line, particularly a superconducting line

A method for determining at least one lineal parameter of a transmission line comprises the following steps: determining at least one measurement of the complex propagation factor &#x3b3; as a function of frequency on the basis of at least one measurement carried out on the transmission line, determining at least one measurement of the lineal attenuation &#x3b1; of the transmission line equal to the real part of the measurement of the complex propagation factor &#x3b3; and/or at least one measurement of the phase factor &#x3b2; of the transmission line equal to the imaginary part of the measurement of the complex propagation factor &#x3b3;, filtering the measurement of the lineal attenuation &#x3b1; and/or the measurement of the phase factor &#x3b2; on the basis of a polynomial frequency regression model dependent on the physical characteristics of the transmission line.

Method of determining lineal parameters of a transmission line

A method for characterizing a segment of a transmission line, a reference signal being injected into the line and a time-domain measurement of the reflection of the reference signal in the line being carried out, the method comprises the following steps: applying a deconvoluting step to the time-domain measurement so as to generate a deconvoluted temporal sequence comprising a plurality of amplitude peaks each corresponding to an impedance discontinuity; removing, from the amplitude of at least one obtained peak, the contribution of at least one secondary reflection of the signal from an impedance discontinuity; deducing, from the temporal position of each peak, a position of an associated impedance discontinuity in the line segment; and deducing, from the amplitude of each peak, an estimate of the real part of the reflection coefficient of a wave reflected from each identified impedance discontinuity.

Method of characterizing a section of a transmission line, in particular section corresponding to a connector or series of connectors linking a measurement apparatus to a cable

A method for automatically measuring physical characteristics of a cable, comprises at least the following steps: positioning on said cable of means for creating an artificial singularity; the injection, at a point of said cable, of an electrical test signal; acquisition of said signal reflected on the singularities that said cable includes so as to produce a first reflectogram; measurement, on said reflectogram, of the temporal position &#x394;t of the peak of the signal derived from its reflection on said artificial singularity; determination of the propagation velocity v=2x/&#x394;t of the signal in said cable from the temporal position &#x394;t and from the position x of said means for creating an artificial singularity on the cable.

Method and device for automatically measuring physical characteristics of a cable, in particular the propagation velocity

The invention relates to a method and a device for analyzing electric cables in a network, for the detection and location of defects in networks comprising at least one junction from which there depart N secondary cable stretches. The method includes interposing in the network, in series at the input of each the secondary stretches (T, T) starting from the junction (A), a respective bidirectional passive filter (FR,FR) able to cut off a frequency band associated with this stretch. The filters all allow through the useful frequencies for the normal operation of the network. A pulsed test is applied to the input of the network signal modulated by N different carrier frequencies each situated in one of the N frequency bands of the filters. The temporal position of test signal spikes reflected for each of the N frequencies is detected, and deducing therefrom the position of possible defects on a stretch of cable of the network.

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Le Plessis Trevise, France

Josy Cohen