| 31 | | || 10.10.2014 || Casey Deen || '''Alignment challenges and strategies for the GRAVITY wavefront sensor cryostat and tower[[BR]]'''[[BR]]Aligning a handful of small mirrors,filters, and lenses with a laser shouldn't be [[BR]]so difficult, right? Surely no more than an afternoon! But after another week [[BR]]spent huddled in a dark laboratory, the light still does not end up in the correct [[BR]]position on the detector! In order to avoid this frustrating situation, an alignment[[BR]]strategy is an important part of building any instrument. Casey Deen presents [[BR]]the alignment concept for the GRAVITY wavefront sensor. This near-infrared [[BR]]sensor works on the Shack-Hartman Principle. Due to their wavelength [[BR]]range, near-infrared sensors have a larger selection of bright guide stars than [[BR]]do optical sensors, as most stars are brightest in the infrared. Optical light is [[BR]]also attenuated more by interstellar dust, making optical sensors impractical [[BR]]in dusty regions like the Galactic Center. The wavefront sensors are located [[BR]]in the Coude rooms of the Unit Telescopes of the Very Large Telescope (VLT). [[BR]]The location and the optical design of the wavefront sensors present several challenges for alignment. Casey and his colleagues present their strategy for [[BR]]alignment of the optics, and are looking forward to hearing opinions, advice [[BR]]and concerns from the assembled experts at MPIA. Expect a lively discussion [[BR]]and insight on what is laboratory work about! [[BR]][[BR]]Vortrag: Englisch [[BR]]Präsentation: Deutsch[[BR]]Fragen: Deutsch, Englisch || |
| | 31 | || 10.10.2014 || Casey Deen || '''Alignment challenges and strategies for the GRAVITY wavefront sensor cryostat and tower[[BR]]'''[[BR]]Aligning a handful of small mirrors,filters, and lenses with a laser shouldn't be [[BR]]so difficult, right? Surely no more than an afternoon! But after another week [[BR]]spent huddled in a dark laboratory, the light still does not end up in the correct [[BR]]position on the detector! In order to avoid this frustrating situation, an alignment[[BR]]strategy is an important part of building any instrument. Casey Deen presents [[BR]]the alignment concept for the GRAVITY wavefront sensor. This near-infrared [[BR]]sensor works on the Shack-Hartman Principle. Due to their wavelength [[BR]]range, near-infrared sensors have a larger selection of bright guide stars than [[BR]]do optical sensors, as most stars are brightest in the infrared. Optical light is [[BR]]also attenuated more by interstellar dust, making optical sensors impractical [[BR]]in dusty regions like the Galactic Center. The wavefront sensors are located [[BR]]in the Coude rooms of the Unit Telescopes of the Very Large Telescope (VLT). [[BR]]The location and the optical design of the wavefront sensors present several[[BR]]challenges for alignment. Casey and his colleagues present their strategy for [[BR]]alignment of the optics, and are looking forward to hearing opinions, advice [[BR]]and concerns from the assembled experts at MPIA. Expect a lively discussion [[BR]]and insight on what is laboratory work about! [[BR]][[BR]]Vortrag: Englisch [[BR]]Präsentation: Deutsch[[BR]]Fragen: Deutsch, Englisch || |
