System for detecting a contrasted target having at least one contrast zone, said detection system being characterised in that: - it comprises at least one first and one second optical device, each comprising: o at least one optic having a focal plane, an optical center and an optical axis perpendicular to the focal plane and passing through the optical center, o at least one optical sensor comprising at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146); said at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146) being positioned with respect to said at least one optic such that the light beams transmitted by said at least one optic are received by said at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146); - the optics of the at least one first and second optical devices are secured to one another and are supported by a first support; - the optical sensors are secured to one another and are supported by a second support; - the first support and the second support are configured to be driven in rotation relative against one another; - said relative rotation is made along an axis of rotation parallel to the optical axes of the optics of the at least first and second optical devices, the axis of rotation being different from said optical axes of the optics; - one single actuator is configured to generate said relative rotation; - said relative rotation is made along a scanning angle, said scanning angle and the distance between the optical center of the at least one optic of each optical device and the axis of rotation of said relative rotation are configured such that for each of the at least two optical sensors, as said relative rotation, for each optical device, the optical center of the at least one optic associated with the at least one optical sensor scans a plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146) of the at least one optical sensor; - the at least first and second optical devices are positioned with respect to said axis of rotation such that said scanning of the optical centers of the optics are made along a first direction for the at least one optical device and along a second direction, different from the first direction, for the at least one second optical device. - it comprises at least one first and one second optical device, each comprising: o at least one optic having a focal plane, an optical center and an optical axis perpendicular to the focal plane and passing through the optical center, o at least one optical sensor comprising at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146); said at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146) being positioned with respect to said at least one optic such that the light beams transmitted by said at least one optic are received by said at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146); o at least one optic having a focal plane, an optical center and an optical axis perpendicular to the focal plane and passing through the optical center, o at least one optical sensor comprising at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146); said at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146) being positioned with respect to said at least one optic such that the light beams transmitted by said at least one optic are received by said at least one plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146); - the optics of the at least one first and second optical devices are secured to one another and are supported by a first support; - the optical sensors are secured to one another and are supported by a second support; - the first support and the second support are configured to be driven in rotation relative against one another; - said relative rotation is made along an axis of rotation parallel to the optical axes of the optics of the at least first and second optical devices, the axis of rotation being different from said optical axes of the optics; - one single actuator is configured to generate said relative rotation; - said relative rotation is made along a scanning angle, said scanning angle and the distance between the optical center of the at least one optic of each optical device and the axis of rotation of said relative rotation are configured such that for each of the at least two optical sensors, as said relative rotation, for each optical device, the optical center of the at least one optic associated with the at least one optical sensor scans a plurality of photosensitive cells (1141, 1142, 1143, 1144, 1145, 1146) of the at least one optical sensor; - the at least first and second optical devices are positioned with respect to said axis of rotation such that said scanning of the optical centers of the optics are made along a first direction for the at least one optical device and along a second direction, different from the first direction, for the at least one second optical device.