Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p33c1582h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P33C-1582
Other
[5704] Planetary Sciences: Fluid Planets / Atmospheres, [6000] Planetary Sciences: Comets And Small Bodies, [6094] Planetary Sciences: Comets And Small Bodies / Instruments And Techniques, [6220] Planetary Sciences: Solar System Objects / Jupiter
Scientific paper
In the study of faint, extended sources at high resolving power in visible and UV ranges, a Spatial Heterodyne Spectrometer (SHS) offers significant etendue advantages relative to conventional dispersive grating spectrometers and other interferometric techniques. The SHS concept was initially introduced at 1991 and it is being developed for planetary sciences. SHS is a compact two-beam interferometer that produces 2-D Fizeau fringe pattern from which the input spectrum can be obtained via a Fourier transform. In the basic SHS design, a visble-UV bandpass instrument can provide a resolving power (R) ~105 over a ~0.5 degree field of view (FOV). The primary limitation comes from its narrow resolvable bandpass that is defined by the highest spatial frequency that can be sampled by the detector (typically ~10Å). This limitation has made these instruments useful primarily for studies of single emission line features or molecular bands. However we are working on a Tunable Spatial Heterodyne Spectrometer (TSHS) design that enables slewing the acceptance band over a much broader spectral range. We describe here continuing progress toward mathematical characterization and development of an all-reflective TSHS prototype. We also describe our laboratory tests over extended targets. Our present effort involves a second-generation TSHS in which we address several technical limitations of an earlier version. In particular the new design reduces wavefront distortions on the pilot mirrors, solves problems with magnification and focus of the fringe localization plane onto the detector, and addresses the variability in sensitivity and resolving power limitations of using a single grating over a large bandpass by using a grating wheel.
Harris William
Hosseini Shahram
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