RESISTIVIMETRE ADAPTE A EVALUER LA RESISTIVITE D'UN SOL PAR DES METHODES DE MESURE ELECTRIQUE DE TYPE GALVANIQUE ET DE TYPE ELECTROSTATIQUE

摘要

The invention relates to a device for measuring the subsurface resistivity of a substrate such as a wall or floor via electric methods, said device comprising: a) a transmitter (1) comprising: - an electric power supply module (5); - injection poles (3) linked to the electric power supply module (5) and intended to be placed in relation to the substrate for the purpose of injecting an alternating electric current into the substrate; b) a receiver (2) comprising: - receiving poles (7) intended to be placed in relation to the substrate in order to be sensitive to an electric signal circulating in the substrate in response to the injection of electric current; - acquisition means (9) linked to the receiving poles (7) for acquiring the electric signal; - measurement means (10) linked to the acquisition means (9) for measuring a voltage of the acquired electric signal; c) means for estimating (20) the resistivity of the substrate on the basis of the injected current and the voltage of the electric signal. According to the invention, the means of acquisition (9) has an input capacity lower than 3 picofarads and an input resistance higher than 10 megaohms.