Hans Thiele - Academia.edu (original) (raw)

Papers by Hans Thiele

Research paper thumbnail of Development and verification of high precision cryogenic lens holders

Research paper thumbnail of Optical Data Transfer System

Research paper thumbnail of Raman LIBS Instrument for ExoMars 2013: calibration and data refining procedures

International Journal of Astrobiology, 2008

Research paper thumbnail of Optical rotating data transmission system with a cleaning device

Research paper thumbnail of Automated Payload and Instruments for Astrobiology

56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2005

Research paper thumbnail of Exobiology payloads for European Mars missions

Research paper thumbnail of International Conference on Space Optics—ICSO 2006 Noordwijk, Netherlands 27–30 June 2006 Raman technology for future planetary missions

Scientific experiments on mineral and biological samples with Raman excitation below 300nm show a... more Scientific experiments on mineral and biological samples with Raman excitation below 300nm show a wealth of scientific information. The fluorescence, which typically decreases signal quality in the visual or near infrared wavelength regime can be avoided with deep ultraviolet excitation. This wavelength regime is therefore regarded as highly attractive for a compact high performance Raman spectrometer for in-situ planetary research. Main objective of the MIRAS II breadboard activity presented here (MIRAS: Mineral Investigation with Raman Spectroscopy) is to evaluate, design and build a compact fiber coupled deep-UV Raman system breadboard. Additionally, the Raman system is combined with an innovative scanning microscope system to allow effective auto-focusing and autonomous orientation on the sample surface for high precise positioning or high resolution Raman mapping.

Research paper thumbnail of Opto-mechanical alignment results of the Euclid near infrared spectro-photometer optical assembly NI-OA

International Conference on Space Optics — ICSO 2018, Jul 12, 2019

Research paper thumbnail of Replicated Micro-Optic Chirped Grating Waveguide Coupler for Data/Telecom Monitorng Applications

A replicated optical microsystem for spectral measurement applications in optical communications ... more A replicated optical microsystem for spectral measurement applications in optical communications is being developed. The current device is based upon a chirped grating waveguide coupler and is designed to monitor data/telecom DWDM channels

Research paper thumbnail of Design and characterization of a tunable polarization-independent resonant grating filter

Research paper thumbnail of <title>A 64 Mpixel camera for the Wendelstein Fraunhofer Telescope Nasmyth wide-field port: WWFI</title>

Ground-based and Airborne Instrumentation for Astronomy III, 2010

ABSTRACT Ludwig-Maximilians-UniversitÂ&amp;Dot;at MÂ&amp;Dot;unchen operates an astrophys... more ABSTRACT Ludwig-Maximilians-UniversitÂ&amp;Dot;at MÂ&amp;Dot;unchen operates an astrophysical observatory on the summit of Mt. Wendelstein1 which will be equipped with a modern 2m-class, robotic telescope.2 One Nasmyth port of the new Fraunhofer telescope is designed to sustain the excellent (&lt; 0.8&quot; median) seeing of the site [1, Fig. 1] over a FOV of 0.2 deg2 utilizing three-element transmissive field corrector optics for optical wavebands. It will be equipped with a camera built around a customized 64 MPixel Mosaic (Spectral Instruments, 4 × (4k)2 15mum e2v CCDs). TheWendelsteinWide Field Imager has two filter wheels with eight slots each (SDSS3 [ugriz] + eight still free) as well as two off-axis guiding units (two FLI Microline with 2k Fairchild CCDs on differential focus stages). A Bonn Shutter4 ensures high precision photometric exposures. An option to either insert a low dispersion grating (for field spectroscopy) or support a wave front sensor probe allows for further expansion of the camera. EMI-safe housing has to overcome the emission of a close by 0.5MW radio station. Special care has been taken to design a very low ghost budget of the overall system to allow for low-surface brightness applications (e.g. weak lensing surveys).

Research paper thumbnail of The compact, low scattered-light 2m Wendelstein Fraunhofer Telescope

Ground-based and Airborne Telescopes III, 2010

Ludwig-Maximilians-Universitat Munchen operates an astrophysical observatory on the summit of Mt.... more Ludwig-Maximilians-Universitat Munchen operates an astrophysical observatory on the summit of Mt. Wendelstein which will be equipped with a modern 2m-class, robotic telescope. The plan is to operate one of the most efficient robotic 2m telescopes in Europe in order to offer ...

Research paper thumbnail of Raman Spectroscopy—A Powerful Tool for in situ Planetary Science

Space Science Reviews, 2007

This paper introduces Raman spectroscopy and discusses various scenarios where it might be applie... more This paper introduces Raman spectroscopy and discusses various scenarios where it might be applied to in situ planetary missions. We demonstrate the extensive capabilities of Raman spectroscopy for planetary investigations and argue that this technique is essential for future planetary missions.

Research paper thumbnail of Device for transmitting optical signals

Research paper thumbnail of Device for transmitting optical signals

Research paper thumbnail of Demonstration of the ExoMars Sample Preparation and Distribution System jointly with an Optical Instrumenr Head

ABSTRACT The ExoMars program will search for past and present life on Mars. ExoMars will address ... more ABSTRACT The ExoMars program will search for past and present life on Mars. ExoMars will address important scientific goals and demonstrate key in-situ enabling technologies. Among such technologies are the acquisition, preparation, distribution and analysis of samples from Mars surface rocks and from the subsurface. The 2018 mission will land an ESA rover on Mars which carries a sample preparation and distribution system (SPDS) and a suite of analytical instruments, the Pasteur Payload with its Analytical Laboratory Drawer (ALD). Kayser-Threde GmbH (Germany) will be responsible for the SPDS as a subcontractor under the mission prime Thales Alenia Space. The SPDS comprises a number of complex mechanisms and mechanical devices designed to transport drill core samples within the rover analytical laboratory, to crush them to powder with a fine grain size, to portion discrete amounts of powdered sample material, to distribute and fill the material into sample containers and to prepare flat sample surfaces for scientific analysis. Breadboards of the crushing mechanism, the dosing mechanism and a distribution carousel with sample containers and a powder sample surface flattening mechanism were built and tested. Kayser-Threde, as a member of the Spanish led ExoMars Raman Instrument team, is also responsible for development of the Raman optical head, which will be mounted inside ALD and will inspect the crushed samples, when they are presented to the instrument by the distribution carousel. Within this activity, which is performed under contract with the Institute of Physical Chemistry of the University of Jena (Germany) and funded by the German DLR, Kayser-Threde can demonstrate Raman measurements with the optical head and a COTS laser and spectrometer and thus simulate the full Raman instrument optical path. An autofocus system with actuator and feedback optics is also part of this activity, which allows focusing the 50 m Raman spot on the surface of the powdered sample. Availability of both, the SPDS mechanisms and the Raman Spectrometer optical head at Kayser-Threde facilities allowed to demonstrate for the first time a sample preparation chain with a joint operation of the optical head. Mineral samples were crushed, dosed into sample containers on the carousel, flattened and then inspected by the Raman optical head. The samples were provided by the University of Jena, a member of the ExoMars Raman science team. This paper will give an overview of the breadboards developed so far for the ExoMars SPDS and the Raman optical head and illustrate the joint demonstration test setup of the SPDS with the instrument. The different behavior of different sample materials will be highlighted and first conclusions will be drawn on what could be learned from test setups combining the ExoMars SPDS and analytical instruments.

Research paper thumbnail of Resonant grating filters at oblique incidence

Lithographic and Micromachining Techniques for Optical Component Fabrication II, 2003

We designed a tunable, oblique incidence resonant grating filter covering the c-band as drop devi... more We designed a tunable, oblique incidence resonant grating filter covering the c-band as drop device. Our resonant grating filter consists of a planar waveguide on a glass substrate covered by low index medium that separates the waveguide from the grating on top of it. With these 3 layers we reach a finesse of more than 3000, which would require much more layers in traditional thin film technology. The drop filter can be tuned by tilting the MEMS platform on which the filter will be glued. Tuning over the c-band will require tilt angles of 3° of the MEMS platform in both directions. Measurements indicate a resonance peak shift of 1.2% and a negligible shape change of the resonance peak from 1526nm at 45° angle of incidence to 1573nm at 53° with a full width at half maximum of 0.4nm. In this range the peak wavelength shift is linear with respect to the change of the AOI.

Research paper thumbnail of Rapid identification of single microbes by various Raman spectroscopic techniques

Research paper thumbnail of DARWIN fringe sensor: experimental results on the BRISE bench

Advances in Stellar Interferometry, 2006

Interferometer performances are linked to the measurement and the correction of telescope aberrat... more Interferometer performances are linked to the measurement and the correction of telescope aberrations. For cophasing the large number of beams required by the DARWIN mission with the specified requirements (realtime piston/tip/tilt correction and measurement of higher orders up to spherical aberration), focal-plane approach has been selected due to its simple opto-mechanical device. Several focal-plane algorithms, developed at ONERA and gathered in the stand-alone MASTIC tool, were validated by experiment with a dedicated breadboard on the laboratory test bench BRISE. Our study shows the correct behaviour of the algorithms for linearity and repeatability; specific requirements are reached for piston/tip/tilt and higher order aberrations. These results confirm the validity of focal-plane sensors for the cophasing of multiple-aperture telescopes.

Research paper thumbnail of MEMS tilting platform for filter tuning in optical telecom

Research paper thumbnail of Development and verification of high precision cryogenic lens holders

Research paper thumbnail of Optical Data Transfer System

Research paper thumbnail of Raman LIBS Instrument for ExoMars 2013: calibration and data refining procedures

International Journal of Astrobiology, 2008

Research paper thumbnail of Optical rotating data transmission system with a cleaning device

Research paper thumbnail of Automated Payload and Instruments for Astrobiology

56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2005

Research paper thumbnail of Exobiology payloads for European Mars missions

Research paper thumbnail of International Conference on Space Optics—ICSO 2006 Noordwijk, Netherlands 27–30 June 2006 Raman technology for future planetary missions

Scientific experiments on mineral and biological samples with Raman excitation below 300nm show a... more Scientific experiments on mineral and biological samples with Raman excitation below 300nm show a wealth of scientific information. The fluorescence, which typically decreases signal quality in the visual or near infrared wavelength regime can be avoided with deep ultraviolet excitation. This wavelength regime is therefore regarded as highly attractive for a compact high performance Raman spectrometer for in-situ planetary research. Main objective of the MIRAS II breadboard activity presented here (MIRAS: Mineral Investigation with Raman Spectroscopy) is to evaluate, design and build a compact fiber coupled deep-UV Raman system breadboard. Additionally, the Raman system is combined with an innovative scanning microscope system to allow effective auto-focusing and autonomous orientation on the sample surface for high precise positioning or high resolution Raman mapping.

Research paper thumbnail of Opto-mechanical alignment results of the Euclid near infrared spectro-photometer optical assembly NI-OA

International Conference on Space Optics — ICSO 2018, Jul 12, 2019

Research paper thumbnail of Replicated Micro-Optic Chirped Grating Waveguide Coupler for Data/Telecom Monitorng Applications

A replicated optical microsystem for spectral measurement applications in optical communications ... more A replicated optical microsystem for spectral measurement applications in optical communications is being developed. The current device is based upon a chirped grating waveguide coupler and is designed to monitor data/telecom DWDM channels

Research paper thumbnail of Design and characterization of a tunable polarization-independent resonant grating filter

Research paper thumbnail of <title>A 64 Mpixel camera for the Wendelstein Fraunhofer Telescope Nasmyth wide-field port: WWFI</title>

Ground-based and Airborne Instrumentation for Astronomy III, 2010

ABSTRACT Ludwig-Maximilians-UniversitÂ&amp;Dot;at MÂ&amp;Dot;unchen operates an astrophys... more ABSTRACT Ludwig-Maximilians-UniversitÂ&amp;Dot;at MÂ&amp;Dot;unchen operates an astrophysical observatory on the summit of Mt. Wendelstein1 which will be equipped with a modern 2m-class, robotic telescope.2 One Nasmyth port of the new Fraunhofer telescope is designed to sustain the excellent (&lt; 0.8&quot; median) seeing of the site [1, Fig. 1] over a FOV of 0.2 deg2 utilizing three-element transmissive field corrector optics for optical wavebands. It will be equipped with a camera built around a customized 64 MPixel Mosaic (Spectral Instruments, 4 × (4k)2 15mum e2v CCDs). TheWendelsteinWide Field Imager has two filter wheels with eight slots each (SDSS3 [ugriz] + eight still free) as well as two off-axis guiding units (two FLI Microline with 2k Fairchild CCDs on differential focus stages). A Bonn Shutter4 ensures high precision photometric exposures. An option to either insert a low dispersion grating (for field spectroscopy) or support a wave front sensor probe allows for further expansion of the camera. EMI-safe housing has to overcome the emission of a close by 0.5MW radio station. Special care has been taken to design a very low ghost budget of the overall system to allow for low-surface brightness applications (e.g. weak lensing surveys).

Research paper thumbnail of The compact, low scattered-light 2m Wendelstein Fraunhofer Telescope

Ground-based and Airborne Telescopes III, 2010

Ludwig-Maximilians-Universitat Munchen operates an astrophysical observatory on the summit of Mt.... more Ludwig-Maximilians-Universitat Munchen operates an astrophysical observatory on the summit of Mt. Wendelstein which will be equipped with a modern 2m-class, robotic telescope. The plan is to operate one of the most efficient robotic 2m telescopes in Europe in order to offer ...

Research paper thumbnail of Raman Spectroscopy—A Powerful Tool for in situ Planetary Science

Space Science Reviews, 2007

This paper introduces Raman spectroscopy and discusses various scenarios where it might be applie... more This paper introduces Raman spectroscopy and discusses various scenarios where it might be applied to in situ planetary missions. We demonstrate the extensive capabilities of Raman spectroscopy for planetary investigations and argue that this technique is essential for future planetary missions.

Research paper thumbnail of Device for transmitting optical signals

Research paper thumbnail of Device for transmitting optical signals

Research paper thumbnail of Demonstration of the ExoMars Sample Preparation and Distribution System jointly with an Optical Instrumenr Head

ABSTRACT The ExoMars program will search for past and present life on Mars. ExoMars will address ... more ABSTRACT The ExoMars program will search for past and present life on Mars. ExoMars will address important scientific goals and demonstrate key in-situ enabling technologies. Among such technologies are the acquisition, preparation, distribution and analysis of samples from Mars surface rocks and from the subsurface. The 2018 mission will land an ESA rover on Mars which carries a sample preparation and distribution system (SPDS) and a suite of analytical instruments, the Pasteur Payload with its Analytical Laboratory Drawer (ALD). Kayser-Threde GmbH (Germany) will be responsible for the SPDS as a subcontractor under the mission prime Thales Alenia Space. The SPDS comprises a number of complex mechanisms and mechanical devices designed to transport drill core samples within the rover analytical laboratory, to crush them to powder with a fine grain size, to portion discrete amounts of powdered sample material, to distribute and fill the material into sample containers and to prepare flat sample surfaces for scientific analysis. Breadboards of the crushing mechanism, the dosing mechanism and a distribution carousel with sample containers and a powder sample surface flattening mechanism were built and tested. Kayser-Threde, as a member of the Spanish led ExoMars Raman Instrument team, is also responsible for development of the Raman optical head, which will be mounted inside ALD and will inspect the crushed samples, when they are presented to the instrument by the distribution carousel. Within this activity, which is performed under contract with the Institute of Physical Chemistry of the University of Jena (Germany) and funded by the German DLR, Kayser-Threde can demonstrate Raman measurements with the optical head and a COTS laser and spectrometer and thus simulate the full Raman instrument optical path. An autofocus system with actuator and feedback optics is also part of this activity, which allows focusing the 50 m Raman spot on the surface of the powdered sample. Availability of both, the SPDS mechanisms and the Raman Spectrometer optical head at Kayser-Threde facilities allowed to demonstrate for the first time a sample preparation chain with a joint operation of the optical head. Mineral samples were crushed, dosed into sample containers on the carousel, flattened and then inspected by the Raman optical head. The samples were provided by the University of Jena, a member of the ExoMars Raman science team. This paper will give an overview of the breadboards developed so far for the ExoMars SPDS and the Raman optical head and illustrate the joint demonstration test setup of the SPDS with the instrument. The different behavior of different sample materials will be highlighted and first conclusions will be drawn on what could be learned from test setups combining the ExoMars SPDS and analytical instruments.

Research paper thumbnail of Resonant grating filters at oblique incidence

Lithographic and Micromachining Techniques for Optical Component Fabrication II, 2003

We designed a tunable, oblique incidence resonant grating filter covering the c-band as drop devi... more We designed a tunable, oblique incidence resonant grating filter covering the c-band as drop device. Our resonant grating filter consists of a planar waveguide on a glass substrate covered by low index medium that separates the waveguide from the grating on top of it. With these 3 layers we reach a finesse of more than 3000, which would require much more layers in traditional thin film technology. The drop filter can be tuned by tilting the MEMS platform on which the filter will be glued. Tuning over the c-band will require tilt angles of 3° of the MEMS platform in both directions. Measurements indicate a resonance peak shift of 1.2% and a negligible shape change of the resonance peak from 1526nm at 45° angle of incidence to 1573nm at 53° with a full width at half maximum of 0.4nm. In this range the peak wavelength shift is linear with respect to the change of the AOI.

Research paper thumbnail of Rapid identification of single microbes by various Raman spectroscopic techniques

Research paper thumbnail of DARWIN fringe sensor: experimental results on the BRISE bench

Advances in Stellar Interferometry, 2006

Interferometer performances are linked to the measurement and the correction of telescope aberrat... more Interferometer performances are linked to the measurement and the correction of telescope aberrations. For cophasing the large number of beams required by the DARWIN mission with the specified requirements (realtime piston/tip/tilt correction and measurement of higher orders up to spherical aberration), focal-plane approach has been selected due to its simple opto-mechanical device. Several focal-plane algorithms, developed at ONERA and gathered in the stand-alone MASTIC tool, were validated by experiment with a dedicated breadboard on the laboratory test bench BRISE. Our study shows the correct behaviour of the algorithms for linearity and repeatability; specific requirements are reached for piston/tip/tilt and higher order aberrations. These results confirm the validity of focal-plane sensors for the cophasing of multiple-aperture telescopes.

Research paper thumbnail of MEMS tilting platform for filter tuning in optical telecom