Diffraction limited slit spectrography

Christoph U. Keller

doi:10.1117/12.188047

30 September 1994 Diffraction-limited slit spectrography

Christoph U. Keller

Proceedings Volume 2302, Image Reconstruction and Restoration; (1994) https://doi.org/10.1117/12.188047
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We present a method to obtain diffraction limited spectrograms of two- dimensional extended objects from a series of ground-based slit- spectrograms. The method is a combination of differential speckle interferometry and a rapid spectrograph scanning scheme. The slit of a spectrograph is scanned over the solar surface while simultaneous images of the reflective slit plate (slit-jaw images) and spectrograms are recorded with an exposure time that is short with respect to seeing-induced variations. A Knox-Thompson speckle reconstruction scheme is applied to the slit jaw images. From the individual slit- jaw images and the speckle reconstruction the instantaneous point spread function can be determined for any location along the slit. The recorded spectrograms can then be restored with the inverted linear operator that describes the formation of the spectrograms. The method has been applied to observations of the quiet solar granulation.

Citation Download Citation

Christoph U. Keller "Diffraction-limited slit spectrography", Proc. SPIE 2302, Image Reconstruction and Restoration, (30 September 1994); https://doi.org/10.1117/12.188047

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