Onsite vibrational characterization of DCMIX2/3 experiments

Ollé, J.; Dubert, Diana; Gavaldà, Jna.; Laverón‐Simavilla, Ana; Ruíz, Xavier; Shevtsova, Valentina

doi:10.1016/j.actaastro.2017.09.007

Cited by 15 publications

(7 citation statements)

References 16 publications

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“…All sensor data have been downloaded from the PIMS NASA website (https://pims.grc. of observing their specific changes (Dubert et al 2017;Ollé et al 2017).…”

Section: Vibrational Characterizationmentioning

confidence: 99%

“…The FFI defined in Ref. Ollé et al (2017) is a scalar indicating a logarithmic relationship between the absolute maximum of the power spectral density (PSD) of the whole frequency range with respect to the relative maximum PSD value for a predefined low frequency range. High values indicate little influence of the above mentioned low frequencies on the ongoing run.…”

Section: Vibrational Characterizationmentioning

confidence: 99%

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Thermodiffusion in Ternary Mixtures of Water/Ethanol/Triethylene Glycol: First Report on the DCMIX3-Experiments Performed on the International Space Station

Triller

Bataller

Bou-Ali

et al. 2018

Microgravity Sci. Technol.

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Q1We report on thermodiffusion experiments conducted on the International Space Station ISS during fall 2016. These experiments are part of the DCMIX (Diffusion and thermodiffusion Coefficients Measurements in ternary Mixtures) project, which aims at establishing a reliable data base of non-isothermal transport coefficients for selected ternary liquid mixtures. The third campaign, DCMIX3, focuses on aqueous systems with water/ethanol/triethylene glycol as an example, where sign changes of the Soret coefficient have already been reported for certain binary subsystems. Investigations have been carried out with the SODI (Selectable Optical Diagnostics Instrument) instrument, a Mach-Zehnder interferometer set up inside the Microgravity Science Glovebox in the Destiny Module of the ISS. Concentration changes within the liquids have been monitored in response to an external temperature gradient using phase-stepping interferometry. The complete data set has been made available in spring 2017. Due to additionally available measurement time, it was possible to collect a complete data set at 30 • C and an almost complete data set at 25 • C, which significantly exceeds the originally envisaged measurements at a single temperature only. All samples could be measured successfully. The SODI instrument and the DCMIX experiments have proven reliable and robust, allowing to extract meaningful data even in case of unforeseen laser instabilities. First assessments of the data quality have revealed six out of 31 runs with some problems in image contrast and/or phase step stability that will require more sophisticated algorithms. This publication documents all relevant parameters of the conducted experiments and also events that might have an influence on the final results. The compiled information is intended to serve as a starting point for all following data evaluations. Q2

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“…All sensor data have been downloaded from the PIMS NASA website (https://pims.grc. of observing their specific changes (Dubert et al 2017;Ollé et al 2017).…”

Section: Vibrational Characterizationmentioning

confidence: 99%

Section: Vibrational Characterizationmentioning

confidence: 99%

Thermodiffusion in Ternary Mixtures of Water/Ethanol/Triethylene Glycol: First Report on the DCMIX3-Experiments Performed on the International Space Station

Triller

Bataller

Bou-Ali

et al. 2018

Microgravity Sci. Technol.

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show abstract

“…This RMS highlights the oscillatory content of the acceleration signal, readily visualizing large sudden variations against the mean value or spikes. In previous works we have identified a warning spike when its RMS value exceeds 20% of the mean of all RMS values of the signal [24]. In these cases, the experimentalists should take them into account when interpreting doubtful experimental results, if any.…”

Section: Vibrational Characterizationmentioning

confidence: 95%

“…Tables 2-6, indicate the runs in which spikes were detected. The Power Spectral Density (PSD) and warning maps based on the RMS values evaluated over one-third octave frequency bands [24,25] were used. As the signals were filtered to 6 Hz, this characterization focuses on the low frequency range which it is known to be the most harmful for the thermodiffussion experiments.…”

Section: Vibrational Characterizationmentioning

confidence: 99%

Data quality assessment of Diffusion Coefficient Measurements in ternary mIXtures 4 (DCMIX4) experiment

et al. 2020

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Thermodiffusion, which leads to a component separation in a mixture due to the thermal gradient, still does not have an unambiguous microscopic picture. Therefore, experimental studies, especially in convection free environment, are important. As part of the 4th campaign on the DCMIX project, thermodiffusion experiments on three compositions of the toluene-methanol-cyclohexane ternary mixture, on a mixture of fullerene-tetrahydronaphthalene-toluene and on a mixture of polystyrene-toluene-cyclohexane have been performed in microgravity conditions on board the International Space Station. A binary mixture of polystyrene-toluene has been filled into the companion cell for the campaign. The Selectable Optical Diagnostics Instrument (SODI), wich is a two-wavelength Mach-Zehnder interferometer for the ternary mixtures, plus a monochromatic Mach-Zehnder interferometer for the binary mixture, has been used in order to obtain the temperature and the concentration fields in the cells. Precisely, it is a 5-steps phase-shifting interferometry technique which is implemented with SODI, producing by means of laser illumination a set of 5 phase-shifted images of between them as function of the time. A total of 58 runs of various durations and at different mean temperatures have been conducted. Here, we evaluate the contrast of the interferograms, the quality in the phase stepping, the stability of the thermal regulation of the experiments and the level of environmental disturbances on board the space station during the campaign.

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“…In the framework of the European Space Agency, all campaigns of the program called "Diffusion and Thermodiffusion Coefficients Measurements in Ternary Mixtures (DCMIX)" aim to accurately measure pure diffusion, thermodiffusion and Soret coefficients of different, but technologically relevant, ternary liquid systems (Shevtsova et al 2014, Triller et al 2018 inside the International Space Station (ISS). Due to the own nature of the physical processes implied, molecular diffusion and thermodiffusion experiments take a long time, therefore, a careful monitoring of the vibrational environment is thus of capital importance to prevent spurious results potentially related to detectable disturbances occurred during the experiments (Jurado et al 2016, Ollé et al 2017, Dubert et al 2018. Based on this, the present work focused on the preliminary characterization of the DCMIX4 accelerometric environment taking into account the signals coming from the es09006 sensor, nearest to the experiment.…”

Section: Introductionmentioning

confidence: 99%

On the Monitoring of the Vibratory Environment of DCMIX4 Campaign. Preliminary Results

Dubert

Marín-Genescà

Simon

et al. 2020

Microgravity Sci. Technol.

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Onsite vibrational characterization of DCMIX2/3 experiments

Cited by 15 publications

References 16 publications

Thermodiffusion in Ternary Mixtures of Water/Ethanol/Triethylene Glycol: First Report on the DCMIX3-Experiments Performed on the International Space Station

Thermodiffusion in Ternary Mixtures of Water/Ethanol/Triethylene Glycol: First Report on the DCMIX3-Experiments Performed on the International Space Station

Data quality assessment of Diffusion Coefficient Measurements in ternary mIXtures 4 (DCMIX4) experiment

On the Monitoring of the Vibratory Environment of DCMIX4 Campaign. Preliminary Results

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