Selectable Optical Diagnostics Instrument (SODI)
The Selectable Optical Diagnostic Instrument (SODI) combines different optical techniques in a single, modular instrument. SODI is equipped with two Mach-Zehnder interferometers that can be operated at two wavelengths (670 and 935 nm).
A piezo activated mirror allows stepping for phase determination. The interferometers are mounted on an experiment specific cell array. The two-colour interferometer is mounted on a translational stage, allowing to scan multiple cells, while the other interferometer (operating at 670 nm) is fixed on one position.
In the present configuration, SODI is also equipped with a Near Field Scattering instrument operating at 935 nm that allows accessing a wave vector range of approximately 2000-20000 cm-1.
Following the same concept adopted for the interferometer, the NFS system can be positioned in order to probe different samples hosted in a cell array.
Due to safety restrictions on the samples used in the first experiments planned, the NFS system will be launched in a sealed box, which will not be re-used for future experiments. However, the modularity of SODI allows for the addition of another NFS system that can be uploaded and adapted to the existing ancillary systems.
SODI is operated remotely inside the Microgravity Science Glovebox.
Last update: 11 January 2010