Spectral Imaging With The Michelson Interferometer

Norman J. E. Johnson

doi:10.1117/12.958717

24 June 1980 Spectral Imaging With The Michelson Interferometer

Norman J. E. Johnson

Proceedings Volume 0226, Infrared Imaging Systems Technology; (1980) https://doi.org/10.1117/12.958717
Event: 1980 Technical Symposium East, 1980, Washington, D.C., United States

Abstract

Geometric subdivision of the interferometer angular field allows essentially unrestricted total solid angle, leading to the superthroughput interferometer. In conjunction with a matrix detector array and specialized processing, this approach permits spectral imaging over large angular fields with virtually the same spectral resolution for all angular resolution elements. The use of correlation spectrometry in the output interferogram greatly simplifies the data processing aspect and permits the simplification of the output presentation to indicate the presence of key spectral signatures within the field with strong background suppression. Experimental data are presented indicating the quality of spectral imaging over the field. The change in optical path difference with angle in the field produces a corres-ponding shift in spectral calibration. This can be corrected by adjusting the reference scale or programming the spectral shift into the correlation functions. Higher frame rates and improved contrast can be obtained by limited scanning at selected offset positions in the wings of the interferograms, and trade-off between processing flexibility and false alarm rate is necessary. Since spectral correlation is done electronically, "filter" functions can be arbitrarily defined, allowing multiband sensing and simultaneous multiple channels, as well as the discrimination of spectral lines. Rapid remote reprogramming of functions is possible, consistent with processing complexity.

Citation Download Citation

Norman J. E. Johnson "Spectral Imaging With The Michelson Interferometer", Proc. SPIE 0226, Infrared Imaging Systems Technology, (24 June 1980); https://doi.org/10.1117/12.958717

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