The small DC drives operate reliably even under hostile ambient conditions. The traditional bell-type armature motor with coreless rotor coil provides an excellent basis for such fields of application. ![]() In this case, drive solutions from FAULHABER were selected. That is why great importance is accorded to the drives on the spindles. In order to ensure the required positioning accuracy, the system has to operate with as little play as possible. At the same time the optical assembly has to be rotated through an angle of up to 36 degrees. Horizontally, distances of up to 200 mm have to be covered (longitudinal positioning), and vertically - for focusing purposes - there are distances of up to 50 mm. For this purpose, the Feinmess company in Dresden (Germany) developed a three-axis positioning system that moves the appropriate optical system on the two reflectors of the LBT into the correct position. If a high-resolution image is to be created by the generation of interference, the optical assemblies that are attached to the two reflectors for bundling and superimposing the reflected light have to be positioned with an accuracy of 5 µm. Positioning unit for interference generation The climate at that altitude is characterized by temperatures below freezing, a very high humidity of up to 90%, as well as extreme temperature fluctuations. Furthermore, they have to operate properly at the site of use under adverse conditions. However, the requirement that has to be met to ensure the LBT works smoothly is that individual components made in the three partner countries - the US, Italy, and Germany - interact without any problems. Consequently, the resolution is nearly ten times better than with conventional standalone telescopes. ![]() In order to achieve the unusually high definition, the rays of light reflected by each reflector are superimposed, i.e. ![]() That way they can use each of the reflectors independently of one another to view the same object, but also study different objects by tilting the viewing axes slightly, or use both reflectors to observe the same object at maximum resolution. The design of the telescope and its integrated optical systems provides scientists with a high level of flexibility when making their observations.
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