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

Luca Incarbone

Fabrice Auzanneau

Laurent Sommervogel

Miguel Gallego Roman

Lola El Sahmarany

A method for detecting soft faults in a transmission line includes the steps of: acquiring a time-domain reflectogram, calculating the integral of the time-domain reflectogram, selecting, in the integral, three samples P, P, P, calculating a first distance equal to the difference in absolute value between the value of the second sample Pand the value of the first sample Por of the third sample P, calculating a second distance equal to the difference in absolute value between the value of the first sample Pand of the third sample P, performing a first comparison of the first distance to the second distance weighted by a weighting coefficient &#x3b2;, deducing from the result of the first comparison information on the existence of a soft fault.

Method for detecting soft faults in a cable, which method is based on the integral of a reflectogram

A method for compensating for the propagation inhomogeneities in a time-domain reflectogram measured for a given cable comprises the following steps, executed in an iterative manner: injecting a test signal into the cable, measuring the reflection of the test signal to form a time-domain reflectogram, identifying at least a time portion of the time-domain reflectogram comprising at least one amplitude peak corresponding to a propagation inhomogeneity, subtracting the identified time portion of the reflectogram, divided by the signal reflection coefficient at the injection point, from the test signal, and replacing the test signal with the result of the subtraction.

Method for compensating for propagation inhomogeneities for a temporal reflectometry signal

A method of testing a cable by distributed reflectometry, comprises: injecting into the cable a first periodic signal and a second periodic signal having the same number N of periods and the same number M of samples per period as the first signal; acquiring a measurement of the reflection, from impedance discontinuities of the cable, of each of said first and second signals; taking the average of said measurements of the reflection of at least one of said first or second signals over all of its periods to produce at least one reflectogram; determining the positions of faults in the cable on the basis of at least the reflectogram; the method being wherein each period of the second signal is injected into the cable with a delay or an advance which has an increasing predetermined absolute value for each successively injected period.

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Luca Incarbone