Abstract: 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 (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) 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.

Abstract: 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 (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) 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.

Abstract: The invention concerns a current-voltage converter comprising electronic means (3,R) to supply a voltage (Vout)from a current (Iph). The converter comprises first means (4, K) to apply or not apply the current at converter input, second means (ECH1) to sample and memorize a voltage (Vout1) at converter output when the current is applied at converter input, third means (ECH2) to sample and memorize a voltage (Vout2, Vout3) at converter output when the current is not applied at converter input, and fourth means (S) for subtracting the voltage sampled and memorized by the third means (ECH2) from the voltage sampled and memorized by the second means (ECH1).

Abstract: This invention relates to a radiation detector comprising at least one semiconducting junction capable of generating electron-hole pairs under the action of the detected radiation and connected in photovoltaic cell mode. The detector comprises means (8, 9, 10, 11, 12) for placing and maintaining the junction at an approximately constant temperature (TA).