2 October 2018 Remote Laser Evaporative Molecular Absorption (R-LEMA) spectroscopy laboratory experiments
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Abstract
To probe the molecular composition of a remote target, a laser is directed at a spot on the target, where melting and evaporation occur. The heated spot serves as a high-temperature blackbody source, and the ejected substance creates a plume of surface materials in front of the spot. Bulk molecular composition of the surface material is investigated by using a spectrometer to view the heated spot through the ejected plume. The proposed method is distinct from current stand-off approaches to composition analysis, such as Laser-Induced Breakdown Spectroscopy (LIBS), which atomizes and ionizes target material and observes emission spectra to determine bulk atomic composition. Initial simulations of absorption profiles based on theoretical models show great promise for the proposed method. This paper compares simulated spectral profiles with results of preliminary laboratory experiments. A sample is placed in an evacuated space, which is situated within the beam line of a Fourier Transform Infrared (FTIR) spectrometer. A laser beam is directed at the sample through an optical window in the front of the vacuum space. As the sample is heated, and evaporation begins, the FTIR beam passes through the molecular plume, via IR windows in the sidewalls of the evacuated space. Sample targets, such as basalt, are tested and compared to the theoretically predicted spectra.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jonathan Madajian, Jonathan Madajian, Gary B. Hughes, Gary B. Hughes, Benton Miller, Benton Miller, Yu Wang, Yu Wang, Dane Brouwer, Dane Brouwer, Alexander Cohen, Alexander Cohen, Jessie Su, Jessie Su, William Strickland, William Strickland, Prashant Srinivasan, Prashant Srinivasan, Travis Brashears, Travis Brashears, Nicholas Rupert, Nicholas Rupert, Philip Lubin, Philip Lubin, } "Remote Laser Evaporative Molecular Absorption (R-LEMA) spectroscopy laboratory experiments", Proc. SPIE 10769, CubeSats and NanoSats for Remote Sensing II, 107690N (2 October 2018); doi: 10.1117/12.2322105; https://doi.org/10.1117/12.2322105
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