Metrology for a solar imaging Fourier transform spectrometer working in the far UV: from the instrumental concept to the first experimental results

摘要

The spectroscopy of the far UV emission lines of the solar spectrum combined with an imaging capability is essential tounderstand the physics of the outer solar atmosphere. An imaging Fourier transform spectrometer (IFTSUV) is anattractive instrumental solution to perform such far-UV solar observations. Working in the far UV involves highprecision metrology to maintain the optical path difference (OPD) during the entire scanning process of theinterferogram. It also involves a compact all-reflection design for UV applications. We present the specification of aservo-system that enables dynamic tip/tilt alignment compensation and OPD sampling measurement of the IFTSUVscanning mirror. We also discuss the first experimental results of a breadboard as well as the preliminary design of aspace-based device.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.