A subtractive double pass spectrograph for solar observations

✍ Scribed by P. Mein; M. Blondel

• Book ID: 104645067
• Publisher: Springer
• Year: 1972
• Tongue: English
• Weight: 810 KB
• Volume: 27
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00153120

✦ Synopsis

Two-dimensional images in locally monochromatic light are obtained, using a subtractive double pass spectrograph. The spatial resolution is high and independent of the spectral bandwidth. The system is very suitable for fine structure observations in strong lines.

A new device was carried out at the Solar Tower in Meudon, in order to obtain spectrographic and spatial informations with short exposures and without any smoothing of the solar image given by the telescope. The principle is the reversal of the dispersion between the first and the second pass. It must be noted that subtracting double-dispersion systems have already been used by r (1950).