The Experts below are selected from a list of 4908 Experts worldwide ranked by ideXlab platform
H. Dittus - One of the best experts on this subject based on the ideXlab platform.
-
A freely falling magneto-optical trap Drop Tower experiment
Applied Physics B, 2007Co-Authors: T. Könemann, Claus Lämmerzahl, W. Brinkmann, Ertan Göklü, H. Dittus, T. Van Zoest, Ernst M. Rasel, Wolfgang Ertmer, W. Lewoczko-adamczyk, Max SchiemangkAbstract:We experimentally demonstrate the possibility of preparing ultracold atoms in the environment of weightlessness at the earth-bound short-term microgravity laboratory Drop Tower Bremen, a facility of ZARM – University of Bremen. Our approach is based on a freely falling magneto-optical trap (MOT) Drop Tower experiment performed within the ATKAT collaboration (“Atom-Catapult”) as a preliminary part of the QUANTUS pilot project (“Quantum Systems in Weightlessness”) pursuing a Bose–Einstein condensate (BEC) in microgravity at the Drop Tower [1, 2]. Furthermore we give a complete account of the specific Drop Tower requirements to realize a compact and robust setup for trapping and cooling neutral rubidium ^87Rb atoms in microgravity conditions. We also present the results of the first realized freely falling MOT and further accomplished experiments during several Drops. The goal of the preliminary ATKAT pilot project is to initiate a basis for extended atom-optical experiments which aim at realizing, observing and investigating ultracold quantum matter in microgravity.
-
A freely falling magneto-optical trap Drop Tower experiment
Applied Physics B, 2007Co-Authors: T. Könemann, Claus Lämmerzahl, W. Brinkmann, Ertan Göklü, H. Dittus, T. Van Zoest, Ernst M. Rasel, Wolfgang Ertmer, W. Lewoczko-adamczyk, Max SchiemangkAbstract:We experimentally demonstrate the possibility of preparing ultracold atoms in the environment of weightlessness at the earth-bound short-term microgravity laboratory Drop Tower Bremen, a facility of ZARM – University of Bremen. Our approach is based on a freely falling magneto-optical trap (MOT) Drop Tower experiment performed within the ATKAT collaboration (“Atom-Catapult”) as a preliminary part of the QUANTUS pilot project (“Quantum Systems in Weightlessness”) pursuing a Bose–Einstein condensate (BEC) in microgravity at the Drop Tower [1, 2].
-
Drop Tower tests of the Weak Principle of Equivalence — One step to space missions for gravitational physics
Advances in Space Research, 2003Co-Authors: H. Dittus, W. Vodel, St. Lochmann, C. Mehls, S. Nietzsche, H. Koch, R. Greger, J.v. Zameck-glyscinskiAbstract:Abstract Experiments on the Drop Tower Bremen aim at a proof of the Weak Equivalence Principle and the determination of the Eotvos factor with an accuracy of less than 10 −12 . The Drop Tower Bremen offers the unique possibility for this pseudo-Galilean test by Dropping two cylindrical bodies of different composition and observing their relative movement. To measure the extremely small displacements, a SQUID-based position detector with an ultra-high resolution has been developed. The low-temperature SQUIDs are unaffected by repeated thermal cycling and have an extremely low-noise-limited resolution of 2 × 10 −12 m/√Hz. The experiments serve not only to prove the Weak Equivalence Principle with an accuracy not attained before, but also to test and develop components for future space missions aimed at carrying out precise gravitation experiments and geodetic measurements. This report focuses on recent experimental results concerning the position control and measurement.
-
Application of LTS-SQUIDs for testing the weak equivalence principle at the Drop Tower Bremen
Physica C-superconductivity and Its Applications, 2002Co-Authors: W. Vodel, Sandor Nietzsche, R. Neubert, H. DittusAbstract:Abstract Free fall tests to prove the weak equivalence principle were rarely be done in history. Presently, very precise fall tests in the 10−13 range are possible and under preparation to be carried out on Drop Tower Bremen during free fall over 109 m. A level of accuracy of 10−18 will be achieved in the current satellite test of the equivalence principle space mission of NASA/ESA. Both kinds of experiments require position detectors with an extremely high resolution to measure infinitesimal displacements of freely falling test masses. On the basis of the LTS SQUID system of the Jena University an experimental setup was developed containing a pair of superconducting levitated test masses installed in a vacuum chamber at 4.2 K. The resolution of the SQUID position detector was measured to be as high as 4×10−14 m/ Hz . This whole apparatus was successfully tested and Dropped at the Drop Tower Bremen providing a free fall height of 109 m corresponding to a flight time of 4.7 s. Recent results of this measurements are described in this work.
-
A new experimental baseline for testing the weak equivalence principle at the Bremen Drop Tower
Classical and Quantum Gravity, 2001Co-Authors: H. Dittus, C. MehlsAbstract:Free-fall experiments to test the weak equivalence principle are in progress at the Drop Tower in Bremen. The differential acceleration of two test masses made from different materials is being measured by means of a superconducting-quantum-interference-device- (SQUID-) based sensing technique. These pseudo-Galilean tests are aimed at determining the Eotvos ratio to an accuracy of better than 10-12. The free-fall height of the experimental capsules is 110 m, translating into an experimental time of about 4.5 s. The SQUID-based sensing system guarantees a high measuring resolution of 10-12 m Hz-1/2 for the relative positions of the test masses.
C. Mehls - One of the best experts on this subject based on the ideXlab platform.
-
Drop Tower tests of the Weak Principle of Equivalence — One step to space missions for gravitational physics
Advances in Space Research, 2003Co-Authors: H. Dittus, W. Vodel, St. Lochmann, C. Mehls, S. Nietzsche, H. Koch, R. Greger, J.v. Zameck-glyscinskiAbstract:Abstract Experiments on the Drop Tower Bremen aim at a proof of the Weak Equivalence Principle and the determination of the Eotvos factor with an accuracy of less than 10 −12 . The Drop Tower Bremen offers the unique possibility for this pseudo-Galilean test by Dropping two cylindrical bodies of different composition and observing their relative movement. To measure the extremely small displacements, a SQUID-based position detector with an ultra-high resolution has been developed. The low-temperature SQUIDs are unaffected by repeated thermal cycling and have an extremely low-noise-limited resolution of 2 × 10 −12 m/√Hz. The experiments serve not only to prove the Weak Equivalence Principle with an accuracy not attained before, but also to test and develop components for future space missions aimed at carrying out precise gravitation experiments and geodetic measurements. This report focuses on recent experimental results concerning the position control and measurement.
-
A new experimental baseline for testing the weak equivalence principle at the Bremen Drop Tower
Classical and Quantum Gravity, 2001Co-Authors: H. Dittus, C. MehlsAbstract:Free-fall experiments to test the weak equivalence principle are in progress at the Drop Tower in Bremen. The differential acceleration of two test masses made from different materials is being measured by means of a superconducting-quantum-interference-device- (SQUID-) based sensing technique. These pseudo-Galilean tests are aimed at determining the Eotvos ratio to an accuracy of better than 10-12. The free-fall height of the experimental capsules is 110 m, translating into an experimental time of about 4.5 s. The SQUID-based sensing system guarantees a high measuring resolution of 10-12 m Hz-1/2 for the relative positions of the test masses.
-
SQUID-based accelerometer and final concept for testing the equivalence principle at the Drop Tower
Microgravity Science and Technology, 2001Co-Authors: C. Mehls, H. Dittus, St. LochmannAbstract:The Weak Equivalence Principle (WEP) is a fundamental principle in physics. Although the most obvious way to proof the equivalence of inertial and gravitational mass is to compare the motion of 2 bodies during free fall, the most precise experiments were made by means of torsion balances (Δa/a=10−12). The few experiments, which tried to test the EP directly on freely falling bodies reached an accuracy of about 10−10, limited by rather short free falling periods. The Drop Tower Bremen provides a much longer time for free fall and together with high sensitive SQUID-based displacement sensors at low temperatures, it seems possible to achieve a better accuracy doing a WEP test at the Drop Tower Bremen. Here we will present the first results of our pre-tests to find an optimum experimental design for a freely falling accelerometer.
-
Drop Tower Tests of the Equivalence Principle
Advances in Space Research, 2000Co-Authors: H. Dittus, W. Vodel, St. Lochmann, C. Mehls, S. Nietzsche, J. V. Zameck Glyscinski, H. KochAbstract:Abstract Up to now an experimental proof of a violation of the Weak Principle of Equivalence (WEP) has been missing. Experiments carried out differ mainly in the applied measurement technique and can be classified into groups: (1) torsion balance experiments and (2) Galilean (free fall) experiments. With torsion balance experiments, the WEP is proven on the 10 −12 level. We discuss the possibility to carry out experiments to test the universality of free fall, the WEP, on Drop Tower Bremen with higher accuracy and report on experimental results.
-
Testing the weak equivalence principle at the Bremen Drop Tower: report on recent developments
Classical and Quantum Gravity, 1996Co-Authors: Hansjörg Dittus, W. Vodel, St. Lochmann, C. Mehls, H. Koch, R. Greger, Sandor Nietzsche, J Von Zameck Glyscinski, P. MaziluAbstract:The weak equivalence principle (WEP) has currently been shown to be valid to an accuracy of . Free-fall experiments over short distances have attained an accuracy of only . Microgravity facilities such as the `Bremen Drop Tower' enable long-distance free-fall experiments which may improve the accuracy to .
Hans J. Rath - One of the best experts on this subject based on the ideXlab platform.
-
The new Drop Tower catapult system
Acta Astronautica, 2006Co-Authors: Peter Von Kampen, Ulrich Kaczmarczik, Hans J. RathAbstract:The Center of Applied Space Technology and Microgravity (ZARM) was founded in 1985 as an institute of the University Bremen, which focuses on research on gravitational and space-related phenomena. In 1988, the construction of the "Drop Tower" began. Since then, the eye-catching Tower with a height of 146 m and its characteristic glass roof has become the emblem of the technology centre in Bremen. The Drop Tower Bremen provides a facility for experiments under conditions of weightlessness. Items are considered weightless, when they are in "free fall", i.e. moving without propulsion within the gravity field of the earth. The height of the Tower limits the simple "free fall" experiment period to max. 4.74 s. With the inauguration of the catapult system in December 2004, the ZARM is entering a new dimension. This world novelty will meet scientists' demands of extending the experiment period up to 9.5 s. Since turning the first sod on May 3rd, 1988, the later installation of the catapult system has been taken into account by building the necessary chamber under the Tower. The catapult system is located in a chamber 10 m below the base of the Tower. This chamber is almost completely occupied by 12 huge pressure tanks. These tanks are placed around the elongation of the vacuum chamber of the Drop tube. In its centre there is the pneumatic piston that accelerates the Drop capsule by the pressure difference between the vacuum inside the Drop tube and the pressure inside the tanks. The acceleration level is adjusted by means of a servo hydraulic breaking system controlling the piston velocity. After only a quarter of a second the Drop capsule achieves its lift-off speed of 175 km/h. With this exact speed, the capsule will rise up to the top of the Tower and afterwards fall down again into the deceleration unit which has been moved under the Drop tube in the meantime. The scientific advantages of the doubled experiment time are obvious: during almost 10 s of high-quality weightlessness the range of compatible experiments amplifies even more and researchers can observe processes for a longer period of time. Thus, the new earth-bound laboratory of the ZARM offers unique conditions for scientific research. Moreover, it increases the attractiveness of the Drop Tower and contributes an important part to the establishment of the Bremen as an international centre for space technology. ?? 2006.
-
Two-dimensional UV-laser diagnostic by high-speed imaging for microgravity combustion research at Bremen Drop Tower
35th Aerospace Sciences Meeting and Exhibit, 1997Co-Authors: Hartmut Renken, Jens Koenig, Ch. Eigenbrod, T. Bolik, Hans J. RathAbstract:A UV-laser based non-intrusive, highly specially and temporally resolving diagnostics for experiments under microgravity condition has been accomplished at (he Drop Tower Bremen recently. By means of an UV-excimer laser beam, that is guided from the top of the Tower into the falling Drop bus, two dimensional measurements of the concentration field of selected species can be conducted with a framing rate of up to 250 pictures/ sec. The data are beeing acquired by a digital high speed camera, that is equipped with a two staged, gated intensifier. The complete picture sequence of 1500 frames (256 x 256 pixel, 8 bit resolution) is stored real time aboard the capsule in a 96MByte RAM image storage unit. For the first time, in situ data of transient combustion phenomena preceding under conditions without thermal bouancy can be obtained by laser-inducedfluorescence LIF and laser-induced-predissociationfluorescence LIPF. In the current project, the gas phase reaction of burning Droplets using different hydrocarbon fuels are beeing investigated by OH-LIPF. The structure of the flame has been identified and the limitations of the technique are discussed.
-
UV laser diagnostic system for combustion research under microgravity at Drop Tower Bremen
Air Pollution and Visibility Measurements, 1995Co-Authors: Hans Stephen Albrecht, Ch. Eigenbrod, Daniel Mueller, Thomas Schroeder, Wolfgang Triebel, Jens Koenig, T. Bolik, T. Behrens, Hartmut Renken, Hans J. RathAbstract:This paper describes a UV laser diagnostic system by means of which laser spectroscopic experiments were performed under microgravity conditions in a ground-based Drop Tower for the first time. A tunable, narrow bandwidth excimer laser is positioned at the top of the Drop Tower. The laser beam enters a falling Drop capsule containing a specially adapted burner or combustion chamber. By the use of laser induced fluorescence spectroscopy measurements of 2D concentration and temperature profiles can be performed. Solutions of selected experimental problems such as laser beam collimation over a distance of more than 120 m, compensation of capsule drift, signal detection, and data acquisition (250 frames/s, 4.7 s measuring period), are discussed in detail. First measurements of laser induced predissociation fluorescence of OH radicals in a methanol flame under microgravity conditions are presented.
Claus Lämmerzahl - One of the best experts on this subject based on the ideXlab platform.
-
A Fast and Self-Acting Release-Caging-Mechanism for Actively Driven Drop Tower Systems
Microgravity Science and Technology, 2017Co-Authors: Andreas Gierse, Ulrich Kaczmarczik, Andreas Greif, Thorben Könemann, Peter Kampen, Hanns Selig, Claus LämmerzahlAbstract:Today’s and future scientific research programs ask for high quality microgravity conditions of 10^−6 g on ground combined with high repetition rates of 100 flights per day or more. Accordingly, a new type of Drop Tower, the GraviTower Bremen, (GTB), has been suggested and is currently under development. As a first stage of development, a GTB-Prototype (GTB-Pro) has been designed which uses an active rope drive to accelerate a slider/drag shield and an experiment therein on a vertical parabola. During the free fall phase, the experiment is decoupled from the slider by a self-acting Release-Caging-Mechanism (RCM). Our prototype will provide 2.5 s of microgravity for experiments of up to 500 kg for at least 100 times per day. In this article, the final concept of the engineering of the active rope drive and the RCM are presented in detail. Based on extensive simulations aiming at an optimization of the whole system we developed a hydraulic rope drive system with minimized vibrational amplitude and low number of eigenfrequencies. The RCM achieves a very fast (≤ 0.1 s) self-acting release of the experiment from the slider by making use of the dynamics of the hydraulic rope drive. Furthermore, passive hydraulic stop dampers in the RCM build a passive and self-acting recoupling mechanism. This system is optimized for a fast decoupling to compensate for the time limitation posed by the chosen drive technology. The simulations included a comparison of different drive technologies, physical effects like the Coriolis force, and the dynamics of the RCM system itself.
-
Concept for a next-generation Drop Tower system
Advances in Space Research, 2015Co-Authors: T. Könemann, Peter Von Kampen, Andreas Gierse, Ulrich Kaczmarczik, Andreas Greif, Christian Eigenbrod, Torsten Lutz, Simon Mawn, Jan Siemer, Claus LämmerzahlAbstract:Abstract The concept for a next-generation Drop Tower system is presented that is motivated by the scientific demand for much higher experiment repetition. This demand resulted in repetition rates of over 100 experiments per day which exceed the current capabilities of operating Drop Towers by far. High experiment repetition rates can for instance be realized through the novel application of a guided electro-magnetic linear drive system in a fully automatic Drop Tower operation. Such a new kind of Drop Tower system combines beneficial technologies of different free fall systems like freely falling Drop capsules, capsule-in-capsule systems, and the vertical parabola method as already utilized in ZARM’s worldwide unique catapult system. This proposed next-generation Drop Tower system named GraviTower Bremen does not only enable experiments with an outstanding microgravity quality (10−6 g, where g is the Earth’s gravitational acceleration) and a duration of 6 s but also novel experiments under partial gravity conditions (0.1 g to 0.4 g) matching those of Moon or Mars with durations of up to 8.5 s. Due to its linear drive system the GraviTower allows the same very low initial acceleration and following deceleration loads onto the experiment. These can be selected according to the experiment’s needs with only 1.5 g or 4 g. The engine power of the linear drive system allows also large payload dimensions and masses. The features and capabilities of the proposed GraviTower Bremen combine all advantages of current Drop Towers and represent the next technological step forward in ground-based research under space conditions.
-
Generating an ultra-stable microwave in the Drop Tower
CLEO:2011 - Laser Applications to Photonic Applications, 2011Co-Authors: Andreas Resch, Claus Lämmerzahl, Sven HerrmannAbstract:In this work we present our efforts to build a Drop Tower compatible setup to generate an ultra-stable microwave signal, which is used for the Raman beams in an atom interferometer.
-
Drop Tower Microgravity Improvement Towards the Nano-g Level for the MICROSCOPE Payload Tests
Microgravity Science and Technology, 2010Co-Authors: Hanns Selig, Hansjörg Dittus, Claus LämmerzahlAbstract:The Bremen Drop Tower at the Center of Applied Space Technology and Microgravity (ZARM) provides high quality micro-g condition needed for many high precision tests. This is even more improved by the development of a free flyer technology. This new technology is used for a free fall test of the MICROSCOPE differential accelerometers which only can work with a residual acceleration disturbance level below 25 nano-g in the high resolution mode. The French MICROSCOPE space mission for testing the Weak Equivalence Principle is scheduled for 2012/2013. The free fall accelerometer test campaign at ZARM is an important part of the pre-mission test program. In this article the new free flyer technology, its performance as well as the accelerometer tests are described.
-
A freely falling magneto-optical trap Drop Tower experiment
Applied Physics B, 2007Co-Authors: T. Könemann, Claus Lämmerzahl, W. Brinkmann, Ertan Göklü, H. Dittus, T. Van Zoest, Ernst M. Rasel, Wolfgang Ertmer, W. Lewoczko-adamczyk, Max SchiemangkAbstract:We experimentally demonstrate the possibility of preparing ultracold atoms in the environment of weightlessness at the earth-bound short-term microgravity laboratory Drop Tower Bremen, a facility of ZARM – University of Bremen. Our approach is based on a freely falling magneto-optical trap (MOT) Drop Tower experiment performed within the ATKAT collaboration (“Atom-Catapult”) as a preliminary part of the QUANTUS pilot project (“Quantum Systems in Weightlessness”) pursuing a Bose–Einstein condensate (BEC) in microgravity at the Drop Tower [1, 2]. Furthermore we give a complete account of the specific Drop Tower requirements to realize a compact and robust setup for trapping and cooling neutral rubidium ^87Rb atoms in microgravity conditions. We also present the results of the first realized freely falling MOT and further accomplished experiments during several Drops. The goal of the preliminary ATKAT pilot project is to initiate a basis for extended atom-optical experiments which aim at realizing, observing and investigating ultracold quantum matter in microgravity.
Ch. Eigenbrod - One of the best experts on this subject based on the ideXlab platform.
-
ESA’s Drop Tower Utilisation Activities 2000 to 2011
Microgravity Science and Technology, 2011Co-Authors: Ewald Kufner, J. Blum, N. Callens, Ch. Eigenbrod, O. Koudelka, A. Orr, C. C. Rosa, A. Vedernikov, S. Will, J. ReimannAbstract:The European Space Research and Technology Center ESTEC, ESA’s premises in Noordwijk, The Netherlands, has a long lasting cooperation with the ZARM-FAB (Centre of Applied Space Technology and Microgravity—Drop Tower Operation and Service Company) in Bremen on the utilization of the Drop Tower for ground-based microgravity research and space hardware development studies. During the period January 2000 to December 2011 ESA will have procured in total some 840 Drops addressing a variety of scientific and technological disciplines. The experiments are usually carried out in campaigns of 15 to 20 Drops each, with an annual average of about 5 campaigns. The cooperation agreement between ESA and the ZARM-FAB includes experiment preparation advice by ZARM’s experts, the integration of the hardware into the Drop capsule, dedicated safety reviews, the execution of the Drop or catapult experiments, the post-flight payload de-integration as well as the handover of acquired data to the experimenters. The experiment hardware itself is provided by the scientists or has to be procured from sources outside of ESA’s Drop Tower utilization contract. ESA appreciates the cooperation of the ZARM-FAB in Bremen whose Drop- and catapult facility provides excellent microgravity quality, is operated by a highly competent, flexible and extremely supportive expert team, allows campaign integration at relatively short notice throughout the entire year, offers real-time experiment operations and immediately after each Drop delivers experiment results and provides on-site hardware modification possibilities.
-
esa s Drop Tower utilisation activities 2000 to 2011
Microgravity Science and Technology, 2011Co-Authors: Ewald Kufner, J. Blum, N. Callens, Ch. Eigenbrod, O. Koudelka, A. Orr, C. C. Rosa, A. Vedernikov, S. Will, J. ReimannAbstract:The European Space Research and Technology Center ESTEC, ESA’s premises in Noordwijk, The Netherlands, has a long lasting cooperation with the ZARM-FAB (Centre of Applied Space Technology and Microgravity—Drop Tower Operation and Service Company) in Bremen on the utilization of the Drop Tower for ground-based microgravity research and space hardware development studies. During the period January 2000 to December 2011 ESA will have procured in total some 840 Drops addressing a variety of scientific and technological disciplines. The experiments are usually carried out in campaigns of 15 to 20 Drops each, with an annual average of about 5 campaigns. The cooperation agreement between ESA and the ZARM-FAB includes experiment preparation advice by ZARM’s experts, the integration of the hardware into the Drop capsule, dedicated safety reviews, the execution of the Drop or catapult experiments, the post-flight payload de-integration as well as the handover of acquired data to the experimenters. The experiment hardware itself is provided by the scientists or has to be procured from sources outside of ESA’s Drop Tower utilization contract. ESA appreciates the cooperation of the ZARM-FAB in Bremen whose Drop- and catapult facility provides excellent microgravity quality, is operated by a highly competent, flexible and extremely supportive expert team, allows campaign integration at relatively short notice throughout the entire year, offers real-time experiment operations and immediately after each Drop delivers experiment results and provides on-site hardware modification possibilities.
-
Two-dimensional UV-laser diagnostic by high-speed imaging for microgravity combustion research at Bremen Drop Tower
35th Aerospace Sciences Meeting and Exhibit, 1997Co-Authors: Hartmut Renken, Jens Koenig, Ch. Eigenbrod, T. Bolik, Hans J. RathAbstract:A UV-laser based non-intrusive, highly specially and temporally resolving diagnostics for experiments under microgravity condition has been accomplished at (he Drop Tower Bremen recently. By means of an UV-excimer laser beam, that is guided from the top of the Tower into the falling Drop bus, two dimensional measurements of the concentration field of selected species can be conducted with a framing rate of up to 250 pictures/ sec. The data are beeing acquired by a digital high speed camera, that is equipped with a two staged, gated intensifier. The complete picture sequence of 1500 frames (256 x 256 pixel, 8 bit resolution) is stored real time aboard the capsule in a 96MByte RAM image storage unit. For the first time, in situ data of transient combustion phenomena preceding under conditions without thermal bouancy can be obtained by laser-inducedfluorescence LIF and laser-induced-predissociationfluorescence LIPF. In the current project, the gas phase reaction of burning Droplets using different hydrocarbon fuels are beeing investigated by OH-LIPF. The structure of the flame has been identified and the limitations of the technique are discussed.
-
UV laser diagnostic system for combustion research under microgravity at Drop Tower Bremen
Air Pollution and Visibility Measurements, 1995Co-Authors: Hans Stephen Albrecht, Ch. Eigenbrod, Daniel Mueller, Thomas Schroeder, Wolfgang Triebel, Jens Koenig, T. Bolik, T. Behrens, Hartmut Renken, Hans J. RathAbstract:This paper describes a UV laser diagnostic system by means of which laser spectroscopic experiments were performed under microgravity conditions in a ground-based Drop Tower for the first time. A tunable, narrow bandwidth excimer laser is positioned at the top of the Drop Tower. The laser beam enters a falling Drop capsule containing a specially adapted burner or combustion chamber. By the use of laser induced fluorescence spectroscopy measurements of 2D concentration and temperature profiles can be performed. Solutions of selected experimental problems such as laser beam collimation over a distance of more than 120 m, compensation of capsule drift, signal detection, and data acquisition (250 frames/s, 4.7 s measuring period), are discussed in detail. First measurements of laser induced predissociation fluorescence of OH radicals in a methanol flame under microgravity conditions are presented.
