Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aomc.book.....h&link_type=abstract
Atomic oxygen in molecular clouds., by Herrmann, F.. Max-Planck-Institut für extraterrestrische Physik, Garching (Germany), Jan
Astronomy and Astrophysics
Astronomy
Scientific paper
This thesis presents instrumental and observational work carried out in the far-infrared wavelength range. An imaging triple Fabry-Perot spectrometer for far-infrared airborne astronomy has been designed and constructed. The work included the design and construction of a 25-channel digital lock-in. The mechanics of the triple Fabry-Perot have been designed such that the adjustment of the device is maintained during cryogenic cycling. A lifting mechanism ensures that the Fabry-Perot can be moved in and out of the beam during observation. The control electronics is based on the principle of a capacitance bridge. Besides the data handling, the VME-bus system performs synchronous actions such as scanning the Fabry-Perots and the control of the chopper electronics. The author describes imaging spectroscopy of the fine structure [O I] line at 63 μm and 145 μm and of the [C II] line at 158 μm in two star-forming regions: the Orion H II region M42 and the optically obscured region DR21.
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