17 August 2009 Single- and dual-wavelength monolithic spatial heterodyne spectrometers for Fraunhofer line discrimination spectroscopy
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Abstract
The background and beginning of this project have been described in a previous SPIE paper1. Since then, the Na monolithic Spatial Heterodyne Spectrometer (SHS) units were constructed, and the housing for the full SHIELDS unit designed and built. The dual-wavelength SHIELDS was designed, and its construction begun, while the LC reflectors used in the selection between wavelengths for the dual-wavelength monolith were tested for efficacy in an instrument-like configuration. Optical modeling and procurement of optical components was completed, making the Na unit nearly ready for lab tests with a low-pressure sodium source, and then appropriate Na-wavelength fluorophores. Atmospheric modeling showed the importance of both dealing with the Ring effect -- as it is at least equal to the fluorescence effect to be measured -- and selecting the best wavelength to observe to mitigate the effects of vegetative fluorescence and water vapor absorption. The full SHIELDS unit has been assembled and initially tested in May 2009, and the dual-wavelength monolith will be completed in July 2009.
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S. Watchorn, S. Watchorn, J. Noto, J. Noto, J. Anderson, J. Anderson, C. E. Sioris, C. E. Sioris, } "Single- and dual-wavelength monolithic spatial heterodyne spectrometers for Fraunhofer line discrimination spectroscopy", Proc. SPIE 7457, Imaging Spectrometry XIV, 74570M (17 August 2009); doi: 10.1117/12.825369; https://doi.org/10.1117/12.825369
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