TESOS performs 2D spectroscopy. Three Fabry-Perot interferometer (etalons) are tuned to scan through a solar absorption line. For each wavelength, 2D images of a narrow band (spectral resolution of 280 000) and of a broad band image are recorded. Approximately 100 wavelength positions can be recorded within 40 seconds. A data reduction software package is available. Data calibration routines are available.
Tritschler, Schmidt, Langhans & Kentischer, 2002, Solar Physics 211, 17: ”High-resolution solar spectroscopy with TESOS - Upgrade from a double to a triple system”.
Kentischer, Schmidt, Sigwarth & von Uexkuell, 1998, A&A 340, 569: ”TESOS, a double Fabry-Perot instrument for solar spectrocopy”.
von der Lühe & Kentischer, 2000, A&AS 146, 499: ”High spatial resolution performance of a triple Fabry-Perot filtergraph”.
A manual as to how to use TESOS/VIP is available in the download section in the right colum.