Height recording system comprising a telescopic rule with two ends cooperating with an optical beam scanning in a horizontal plane

Height recording system comprising a telescopic rule formed from a head and a set of telescopic tubes for varying the distance between one support end forming a base for the telescopic assembly and an upper end supporting the head, called the extension distance of the telescopic rule, the telescopic rule being arranged to cooperate with an optical scanning beam output from a laser scanning system, in a horizontal plane, the telescopic rule including:

• a measurement and calculation system for measuring and calculating said extension distance;
• a sensitive receiver, in the head of the telescopic rule, including photosensitive cells to detect the optical beam output from the laser system;
• a module for starting or validating a height measurement by the measurement and calculation system, connected to be responsive to the sensitive receiver and to the measurement and calculation system, and starting the measurement or the validation in response to the module receiving a determined signal from the sensitive receiver, the determined signal being representative of detection of the laser beam by one of the photosensitive cells in the sensitive receiver.