| 37 | 37 | || '''25.11.2016''' || '''Michael Boehm (ISYS, Stuttgart)''' || '''OVMS-plus: Disturbance compensation at the LBT'''[[BR]][[BR]]Interferometry at modern large ground-based telescopes often utilizes an array of telescopes. However, this is only possible if the length of the light path is equal for all telescopes, i.e. the optical path difference (OPD) has to be zero. Because the optical elements of the telescopes tend to vibrate due to wind excitation, for example, the OPD is usually oscillating with peak-to-peak amplitudes of several µm and frequencies up to 60Hz. Without proper active compensation, this would render most measurement attempts in the near-infrared (NIR), rather useless, since . Thus, large telescopes such as the Large Binocular Telescope (LBT) are equipped with a dedicated OPD and vibration monitoring system (OVMS) to be able to measure these disturbances and compensate for them in a fast feed-forward manner.[[BR]][[BR]]At the beginning of the talk Michael Boehm will briefly revisit the OVMS at the LBT and describe how the accelerometer readings can be used for disturbance compensation. The second part of the talk will present the new enhanced and centralized software architecture, called OVMS-plus, and illustrate several challenges faced during the implementation phase. [[BR]][[BR]]Finally, measurement results from LBTI proving the effectiveness of the approach and the ability to compensate for a large fraction of the telescope induced vibrations will be presented.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-11-25_OVMSplus.pdf Slides: English][[BR]]Questions: German, English || |
