Method for detecting a change in the environment of a cable
AssigneesUniversite De Reims Champagne-Ardenne, Cetim
InventorsLanto Rasolofondraibe, Bernard Pottier, Sylvain Acoulon
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Abstract
Method for detecting a change in the environment near at least one portion of a hoisting, traction or boundary cable which conducts electricity. The change in the environment is linked to the relative movement of at least one person, animal or object with respect to the portion. The method includes the step of detecting a variation in the capacitance of the portion. The variation is representative of the movement.
Claims14
A method for detecting a change in the environment in the vicinity of at least an electrically-conductive portion of a lifting, traction or boundary cable, that change in the environment being linked to the relative movement of at least one individual, animal or object relative to said portion, the method including the step consisting in detecting a variation of the capacitance of said portion representative of said movement wherein:
- said portion being raised to a predefined variable potential, the cable extending over at least a part of its length facing a screen raised to said predefined potential reducing the surface charge density of the cable portion situated facing this screen.
A method for detecting a change in the environment in the vicinity of at least an electrically-conductive portion of a lifting, traction or boundary cable, that change in the environment being linked to the relative movement of at least one individual, animal or object relative to said portion, the method including the step consisting in detecting a variation of the capacitance of said portion representative of said movement, said portion being raised to a predefined variable potential, the cable including at least one electrical conductor supplying power to an element moved by the cable, said at least one electrical power supply conductor being surrounded by at least one screen raised to said predefined potential, said at least one conductive portion being situated outside that screen wherein a grounded shield surrounds the screen raised to the predefined potential, said at least one conductive portion being situated outside that shield.
A method for detecting a change in the environment in the vicinity of at least an electrically-conductive portion of a lifting, traction or boundary cable, that change in the environment being linked to the relative movement of at least one individual, animal or object relative to said portion, the method including the step consisting in detecting a variation of the capacitance of said portion representative of said movement, the variation of the capacitance being detected by measuring the current injected into said at least one portion and/or the cable being unwound from a winding and/or driving system, the variation of the capacitance of said at least one portion being detected with compensation of the variation of the electrical load induced by a modification of the unwound cable length and/or in which there are acquired both a quantity representing the variation of capacitance of said cable portion and a quantity representing movement of the cable, and/or the trend of the variation of the capacitance with time and/or as a function of the movement of the cable being compared to reference data, the method including the acquisition of reference data by causing the individual, animal or object to move in a predefined manner relative to the cable or including the acquisition of reference data by causing the cable and/or an element attached to the cable to effect a predefined movement.
Dependencies are inferred from the claim text.