Compact active high-resolution imaging system

Ivo Buske; Wolfgang Riede

doi:10.1117/12.800309

7 October 2008 Compact active high-resolution imaging system

Ivo Buske, Wolfgang Riede

Proceedings Volume 7112, Unmanned/Unattended Sensors and Sensor Networks V; 71120B (2008) https://doi.org/10.1117/12.800309
Event: SPIE Security + Defence, 2008, Cardiff, Wales, United Kingdom

Abstract

High-resolution telescope systems used for observational tasks require sufficiently large apertures to enhance the spatial resolution. Due to the propagation through turbulent layers of the atmosphere the distorted wavefront implicates a broadening of the imaged spot and hence a loss in optical resolution. The improvement in visual resolution by applying adaptive optics has been successfully demonstrated in a mobile telescope platform. To compensate for the effects of atmospheric turbulence, a closed-loop system was developed with a bandwidth of up to 600 Hz capable to achieve a wavefront correction with a residual wavefront deformation of <50 nm RMS. A reference signal which is probing the wavefront distortion is realized with the help of a coherent laser beam emanating from the object. The developed adaptive optical system is capable of compensating phase distortions in a conjugated plane with time constants of 30 ms. Turbulence was artificially induced along the optical path by a turbulence generator. Measurements of MTF values and Strehl ratio will be presented.

Citation Download Citation

Ivo Buske and Wolfgang Riede "Compact active high-resolution imaging system", Proc. SPIE 7112, Unmanned/Unattended Sensors and Sensor Networks V, 71120B (7 October 2008); https://doi.org/10.1117/12.800309

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