Spatial heterodyne spectroscopy for atmospheric remote sensing

Fred L. Roesler; John M. Harlander

doi:10.1117/12.366387

20 October 1999 Spatial heterodyne spectroscopy for atmospheric remote sensing

Fred L. Roesler, John M. Harlander

Proceedings Volume 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III; (1999) https://doi.org/10.1117/12.366387
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Spatial heterodyne spectroscopy (SHS) is a relatively new and incompletely developed method of Fourier transform spectroscopy that has advantages over conventional FTS in certain applications. In the SHS instrument, diffraction gratings replace the flat mirrors used in each arm of a conventional Michelson, and an imaging detector is used at the output to record a spatially heterodyned interferogram without any scanning elements. The mechanical simplicity of a diffraction grating is combined with the high light-gathering power of interference spectrometers. SHS systems can achieve an additional light-gathering gain of about two orders of magnitude over conventional FTS or Fabry-Perot interference spectrometers by field-widening using fixed transmitting wedges. Compared to conventional instruments, these gains translate into smaller instruments and/or higher sensitivity for a specified application. Flatness defects in the optics can largely be corrected in software, leading to relaxed tolerances which simplify extension to short wavelengths. This paper focuses on the concepts used in the design of an SHS for mesospheric OH remote sensing at 308 nm, and their validation in laboratory testing. A field-widened system has been constructed, and will soon undergo performance tests with an eye towards space application in the relative near future. Compared to a conventional grating spectrograph used previously for OH measurements, the SHS system is designed to achieve higher resolving power and several times more sensitivity in 1/10 or less of the volume, and with no moving parts.

Citation Download Citation

Fred L. Roesler and John M. Harlander "Spatial heterodyne spectroscopy for atmospheric remote sensing", Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, (20 October 1999); https://doi.org/10.1117/12.366387

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