APPARATUS FOR INSPECTION OF A FLAT STRUCTURE
The apparatus for inspection of a flat structure (8) has an upper carriage (10) which is intended for arrangement on the upper face of the flat structure (8) and a lower carriage (20) which is intended for arrangement on the lower face of the flat structure (8). Magnets which are arranged in the upper and lower carriages (10, 20) hold the upper and lower carriages (10, 20) on opposite sides of the flat structure (8). A drive device, which has a caterpillar drive with two drive belts (12) separated laterally moves the apparatus over the flat structure (8). Each drive belt (12) may have its own drive, and the drive belts (12) can be driven at different speeds. A measurement device (36, 50) can be provided on at least one of the carriages (10, 20), in which case the measurement device can be connected as a module (30) to the upper or lower carriage (10, 20). A movement distance determination device (40) can be provided for determination of the movement distance travelled by the apparatus. The measurement module (30) can be mounted in a floating manner in the upper carriage (10), with an opposing measurement plate being mounted in a floating manner in the lower carriage (20), with additional, dedicated magnets being provided on the measurement module (30) and on the opposing measurement plate, in order to hold them on the opposite sides of the flat structure.