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Dive into the research topics where Ivo Buske is active.

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Featured researches published by Ivo Buske.


BEAMED ENERGY PROPULSION: Seventh International Symposium | 2011

Laser-Based Space Debris Monitoring

Uwe Voelker; Ivo Buske; Thomas Hall; Bernd Hüttner; Wolfgang Riede

The extended use of outer space left remarkable amounts of objects uncontrollably orbiting the earth. These objects, hereafter denoted as “space debris”, impose reasonable risk on present space missions, as they hold relative velocities on the order of 10 km/s. Due to their high kinetic energies, objects up from 1 cm size have to be monitored in order to prevent collisions with satellites. For the purpose of accuracy and effectiveness, we present a concept for a laser‐based space debris monitoring system. The chosen approach is primarily based on laser ranging of optically non‐cooperative targets. The involved physical processes such as optical turbulence, absorption, and scattering are modeled and the results will define the design of a future system. In addition, short range on‐ground tracking and ranging will be conducted where downscaling of photon densities simulates the strong signal attenuation and system feasibility will be proven.


Proceedings of SPIE, the International Society for Optical Engineering | 2007

A real-time sub-μrad laser beam tracking system

Ivo Buske; Ralph Schragner; Wolfgang Riede

We present a rugged and reliable real-time laser beam tracking system operating with a high speed, high resolution piezo-electric tip/tilt mirror. Characteristics of the piezo mirror and position sensor are investigated. An industrial programmable automation controller is used to develop a real-time digital PID controller. The controller provides a one million field programmable gate array (FPGA) to realize a high closed-loop frequency of 50 kHz. Beam tracking with a root-mean-squared accuracy better than 0.15 μrad has been laboratory confirmed. The system is intended as an add-on module for established mechanical mrad tracking systems.


Proceedings of SPIE, the International Society for Optical Engineering | 2006

Sub-μrad laser beam tracking

Ivo Buske; Wolfgang Riede

We compare active optical elements based on different technologies to accomplish the requirements of a 2-dim. fine tracking control system. A cascaded optically and electrically addressable spatial light modulator (OASLM) based on liquid crystals (LC) is used for refractive beam steering. Spatial light modulators provide a controllable phase wedge to generate a beam deflection. Additionally, a tip/tilt mirror approach operating with piezo-electric actuators is investigated. A digital PID controller is implemented for closed-loop control. Beam tracking with a root-mean-squared accuracy of Δα=30 nrad has been laboratory-confirmed.


Technologies for Optical Countermeasures XIII | 2016

Accuracy analysis of a mobile tracking system for angular position determination of flying targets

Andreas Walther; Ivo Buske; Wolfgang Riede

Lasers arouse an increasing interest in remote sensing applications. In order to deliver as much as possible of the available laser power onto a flying object the subsystems of a beam control system have to operate precisely together. One important subsystem is responsible for determination of the target’s angular position. Here, we focus on an optical system for measuring precisely the angular position of flying objects. We designed this subunit of a beam control system exclusively from readily available commercial-off-the-shelf components. Two industrial cameras were used for angle measuring and for guiding the system to the position of the flying object. Both cameras are mounted on a modified astronomical mount with high-precision angle encoders. To achieve a high accuracy we temporally synchronize the acquisition of the angle from the pan tilt unit with the exposure of the camera. Therefore, a FPGA-based readout device for the rotary encoders was designed and implemented. Additionally, we determined and evaluated the influence of the distortion of the lenses to the measurement. We investigated various scenarios to determine the accuracy and the limitations of our system for angular position determination of flying targets. Performance tests were taken indoor and outdoor at our test sites. A target can be mounted on a fast moving linear stage. The position of this linear stage is continuously read out by a high resolution encoder so we know the target’s position with a dynamic accuracy in the range of a few μm. With this setup we evaluated the spatial resolution of our tracking system. We showed that the presented system can determine the angular position of fast flying objects with an uncertainty of only 2 μrad RMS. With this mobile tracking system for angular position determination of flying targets we designed an accurate cost-efficient opportunity for further developments.


Technologies for Optical Countermeasures XIII | 2016

Setup of a beam control system for high power laser system at DLR

Ivo Buske; Andreas Walther

Different types of high power or high energy lasers in the multi kW class are currently available or are under development with promising progress reports. A major challenge is to deliver as much as possible of the available power onto a small and fast moving target over a long distance through a disturbing atmosphere. High resolution imaging is a common way to identify the category of targets dedication and to determine the spatial position relative to the observer. By illuminating the target with a laser the imaging system becomes more resilient towards ambient light and the exposure time can be reduced drastically. Fast and deterministic control loops are demanding for the moving parts in order to maintain a high accuracy for the pointing of the turret and aiming of the laser countermeasure system. Here, we report on the progress of such a beam control system developed at the Institute of Technical Physics of DLR. In an overview we present the beam control system and explain different sub-systems. Performance tests were taken at our test. At a distance we simulated various scenarios for probing the limits of the tracking and pointing accuracy with a target on a fast moving linear stage. We present first results of the beam control system performance.


Remote Sensing of Clouds and the Atmosphere XVIII; and Optics in Atmospheric Propagation and Adaptive Systems XVI | 2013

Imaging through atmospheric turbulence for laser based C-RAM systems: an analytical approach

Ivo Buske; Wolfgang Riede; Jürgen Zoz

High Energy Laser weapons (HEL) have unique attributes which distinguish them from limitations of kinetic energy weapons. HEL weapons engagement process typical starts with identifying the target and selecting the aim point on the target through a high magnification telescope. One scenario for such a HEL system is the countermeasure against rockets, artillery or mortar (RAM) objects to protect ships, camps or other infrastructure from terrorist attacks. For target identification and especially to resolve the aim point it is significant to ensure high resolution imaging of RAM objects. During the whole ballistic flight phase the knowledge about the expectable imaging quality is important to estimate and evaluate the countermeasure system performance. Hereby image quality is mainly influenced by unavoidable atmospheric turbulence. Analytical calculations have been taken to analyze and evaluate image quality parameters during an approaching RAM object. In general, Kolmogorov turbulence theory was implemented to determine atmospheric coherence length and isoplanatic angle. The image acquisition is distinguishing between long and short exposure times to characterize tip/tilt image shift and the impact of high order turbulence fluctuations. Two different observer positions are considered to show the influence of the selected sensor site. Furthermore two different turbulence strengths are investigated to point out the effect of climate or weather condition. It is well known that atmospheric turbulence degenerates image sharpness and creates blurred images. Investigations are done to estimate the effectiveness of simple tip/tilt systems or low order adaptive optics for laser based C-RAM systems.


Optics in Atmospheric Propagation and Adaptive Systems XIV | 2011

Compensating aberrations of a 6 inch concave membrane mirror

Ivo Buske; Peter Becker

Large and lightweight primary mirrors of high optical quality are considered to be a key element of next generation deployable space telescopes. In this paper we present a membrane mirror demonstrator and show experimental results of the associated mechanical and optical characteristics. The mounting conditions of such a membrane mirror cause static optical aberrations which are compensated as a proof of principle using an adaptive mirror and a metric optimizationbased control system. The feasibility of the complete system for receiving and transmitting applications will be discussed.


european quantum electronics conference | 2009

A mobile adaptive optics system for compensation of atmospheric turbulence-induced phase distortions

Ivo Buske; Wolfgang Riede

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 [1].


Proceedings of the Sixth International Workshop | 2008

FAST CLOSED-LOOP ADAPTIVE OPTICS SYSTEM FOR IMAGING THROUGH STRONG TURBULENCE LAYER – Oral Paper

Ivo Buske; Wolfgang Riede

We present an adaptive optics approach to improve the image quality of telescopes observing targets through atmospheric turbulences. Intended as an enhancement for off-the-shelf imaging systems an f/10 achromatic lens telescope is expanded by relay telescopes and dichroitic beam splitters to satisfy the adaptive optics requirements. A high speed Shack-Hartmann wavefront sensor and an adaptive membrane mirror are located in conjugated planes. A non-deterministic PC system provides a fast closed-loop frequency of 500 Hz. The system characteristics are investigated and first results in terms of wavefront diagrams and resolution charts are presented.


Proceedings of SPIE, the International Society for Optical Engineering | 2008

Compact active high-resolution imaging system

Ivo Buske; Wolfgang Riede

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.

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Uwe Völker

German Aerospace Center

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Adolf Giesen

German Aerospace Center

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Uwe Voelker

German Aerospace Center

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D. Hampf

University of Hamburg

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Leif Humbert

German Aerospace Center

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Paul Wagner

German Aerospace Center

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