Modular laser system for level determination

Modular laser level determination system comprising a laser beam generator in a housing (1), fixed with means of positioning with respect to a plane parallel to the base plane (B) of the said housing (1), the laser beam being oriented towards a central shaft inside the housing (1) not closed off by any obstacles and firstly passing through collimation means, a rotation drive module of an optical assembly comprising at least one reflection plane, the said rotation drive module being arranged along a direction approximately coaxial with the centre line of the laser beam, characterized by the fact that the rotation drive module of the said optical assembly comprises a brushless motor (1) with electronic switching and a hollow shaft (51), the stator (53) of which is fixed to an element fixed in rotation about an axis parallel to the axis of the laser beam and that can be tilted by a module for determination and adjustment of the inclination with respect to a reference plane parallel to the bearing plane of the enclosure of the housing (1), the said laser beam generator being fixed to the brushless motor (5).