The use of image stabilization has grown to the point that it is now a common component of modern optical systems for imaging, communications, and remote-sensing applications. The benefits of image stabilization to astronomical research alone are so rich that it is common for astronomical telescopes, built over the last century, to be retrofitted with fast steering mirrors and tip-tilt sensors to extend their useful lifetimes. This text provides the basics of image stabilization starting with a consideration of the cause of image blurring and an introduction to the components commonly used in constructing a stabilized imaging system. With this foundation, an example image stabilized system is described and used to introduce some of the important parameters in evaluating the performance of image stabilization systems. As image stabilization systems are key components of adaptive optics systems, the more sophisticated sensing and correction devices used in this area are briefly addressed. Rather than being a mathematical, rigorous treatment of image stabilization, it provides the basic ideas in an easy-to-read format

    Chapter 5. Image-Stabilization Systems Simplified. 5.1. Introduction -- 5.2. Integrating sensor and compensator -- 5.3. System control -- 5.4. Model image stabilizer -- 5.5. Information flow for image stabilization -- 5.6. Types of controllers

    Chapter 1. Image stabilization. 1.1. Introduction -- 1.2. Wavefronts -- 1.3. Wavefronts and optical systems -- 1.4. Beam wander -- 1.5. Image jitter -- 1.6. Beam wander vs. image jitter

    Chapter 2. Effects of turbulence on a wavefront. 2.1. Introduction -- 2.2. Effect of the atmosphere -- 2.3. Description of a wavefront -- 2.4. Angle of arrival fluctuations -- 2.5. Higher-order modes -- 2.6. Global tip and tilt -- 2.7. Effect of the atmosphere on intensity at a receiver

    Chapter 3. Wavefront sensing. 3.1. Introduction -- 3.2. Transforming optical path length differences to intensity variations -- 3.3. Interferometry -- 3.4. Phase contrast -- 3.5. Local slope measurement

    Chapter 4. Low-order wavefront compensation. 4.1. Introduction -- 4.2. Wavefront compensation -- 4.3. Wavefront correctors for piston, tip and tilt -- 4.4. Use of tip-tilt correction with laser guide stars -- 4.5. Mechanical operation of tip-tilt stages

    Chapter 6. Performance. 6.1. Introduction -- 6.2. Image structure -- 6.3. Strehl ratio -- 6.4. Performance evaluation

    Chapter 7. Image-Stabilization Systems. 7.1. Introduction -- 7.2. Astronomical imaging tip-tilt systems -- 7.3. Programs using image stabilization -- 7.4. Beam steering for interferometers -- 7.5. Stabilized long-baseline interferometers

    Chapter 8. Alternative approaches. 8.1. Introduction -- 8.2. Liquid crystal spatial light modulators -- 8.3. Orthogonal transfer charge coupled devices -- 8.4. Micro-electro-mechanical systems -- Bibliography -- Index


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    Titel :

    Introduction to image stabilization




    Erscheinungsdatum :

    2006


    Format / Umfang :

    1 online resource (x, 98 p. : ill.)


    Anmerkungen:

    Campusweiter Zugriff (Universität Hannover) - Vervielfältigungen (z.B. Kopien, Downloads) sind nur von einzelnen Kapiteln oder Seiten und nur zum eigenen wissenschaftlichen Gebrauch erlaubt. Keine Weitergabe an Dritte. Kein systematisches Downloaden durch Robots.
    "SPIE digital library. - Includes bibliographical references (p. 93-95) and index. - Title from PDF t.p. (viewed on 8/23/09)
    Includes bibliographical references (p. 93-95) and index
    Restricted to subscribers or individual electronic text purchasers




    Medientyp :

    Buch


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


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