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Observing micrometeoroids

Observing micrometeoroids. Piero Mazzinghi, Vojko Bratina, Alessandro Zuccaro , Lisa Gambicorti Istituto Nazionale di Ottica Applicata. Istituto Nazionale di Ottica Applicata. Florence, 1 Mar 2005 . INOA. Overview. Three options proposed: One All-Refractive system

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Observing micrometeoroids

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  1. Observing micrometeoroids Piero Mazzinghi, Vojko Bratina, Alessandro Zuccaro, Lisa Gambicorti Istituto Nazionale di Ottica Applicata Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  2. Overview • Three options proposed: • One All-Refractive system • Two Catadioptric systems: • Schmidt design with FOV 0° to ±25° • “Enhanched Schmidt” design with FOV ±17° to ±40° Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  3. Observation technique: Wide FOV Refractive Camera • PROS: • No obscurations • Only spherical elements • CONS: • Cumbersome (heavy?) • Chromatic aberrations • Transmission issues FOV = 170° F/# = 1.8 9 elements, in visible Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  4. Wide Angle Schmidt system: design Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  5. Schmidt system: some details • ADVANTAGES: • large field of view • very low f/# • lightweight corrector • construction technologies exists (from ‘40s) • only one aspherical surface • filter can be integrated in the corrector • low stray light • DISADVANTAGES: • obstruction by the focal plane • difficult support for the detector • large mirror (potentially heavy) • curved image, but it can be flattened Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  6. Observing from balloon: an example of catadioptric Convex primary mirror + concave secondary, with aspheric corrector and spherical focal surface Hole in center of focal surface! F/1 system, EPD = 1050 mm 17° 40° Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  7. Catadioptric system: Vignetting considerations Vignetting Diagram: discrete over 17°! “Spot” behind Focal Surface Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  8. Catadioptric system (continued) • PROS: • Few elements • Lightweight • Only one aspheric surface • Can have bigger FOV • Small F/# • CONS: • Large mirrors • Central obscuration • Considerable vignetting Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

  9. Wide Field systems: comparisons • Wide field refractive system is already a reality for many applications, but has to deal with considered spectral range, possible complexity and weight. • Wide field Schmidt camera has good potentialities but constrained by design up to 50° FOV. • Wide field convex-concave catadioptric system can easly reach large FOV but gives up central fields. Design choice and implementations depend on science to be pursued! Istituto Nazionale di Ottica Applicata Florence, 1 Mar 2005 INOA

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