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Full-Text Articles in Chemistry
Raman Spectroscopy Using A Monolithic Spatial Heterodyne Raman Spectrometer For Planetary Exploration, Abigail M. Waldron
Raman Spectroscopy Using A Monolithic Spatial Heterodyne Raman Spectrometer For Planetary Exploration, Abigail M. Waldron
Theses and Dissertations
Raman spectroscopy is a vibrational technique that provides detailed molecular and structural information for organic and inorganic molecules and minerals, and is uniquely suited for spacecraft applications, in the search for chemical indicators of life. This is why NASA sent two Raman spectrometers to Mars on the Mars 2020 Perseverance rover, as part of the SuperCam and SHERLOC instruments. The Raman spectrometers on Perseverance are conventional dispersive instruments that have been engineered to survive the harsh conditions of spaceflight. Future missions could benefit from smaller, more robust designs, especially missions to the Jovian planets, Jupiter and Saturn, their moons, asteroids …
A Spatial Heterodyne Spectrometer For Raman Imaging And Remote Spectroscopy, Ashley Nicole Allen
A Spatial Heterodyne Spectrometer For Raman Imaging And Remote Spectroscopy, Ashley Nicole Allen
Theses and Dissertations
Raman and Laser-Induced Breakdown Spectroscopy (LIBS) are optical techniques that provide information about the chemical makeup of a sample without any preparation or physical contact with it. For this reason, Raman and LIBS spectrometers are among the instruments selected for NASA’s Mars 2020 rover mission and are being considered for future missions to the Jovian moons, asteroids and comets. Such future missions will require smaller, more ruggedized Raman and LIBS spectrometers, and the new type of spectrometers discussed here, the spatial heterodyne Raman and LIBS spectrometers are being developed for this purpose. The SHS is a wide-field, Fourier transform, stationary …
Development Of A High-Resolution Spatial Heterodyne Libs Spectrometer, Kevin A. Dudley
Development Of A High-Resolution Spatial Heterodyne Libs Spectrometer, Kevin A. Dudley
Theses and Dissertations
Laser-Induced Breakdown Spectroscopy (LIBS) is an atomic emission technique that uses a pulse laser to ablate a sample and form a plasma. Atomic emissions from the plasma provide unique elemental characteristics regarding the composition of the sample. The technique produces valuable qualitative results, but the accuracy of quantitative analyses is hindered by spectral line broadening mechanisms and laser pulse reproducibility, among other factors. The Spatial Heterodyne Spectrometer (SHS) is a high-resolution spectrometer with very high light throughput, and its use to LIBS is currently limited to two peer-reviewed publications. In the following work a high resolution SHS is developed and …
Wide Field Measurements Using A Spatial Heterodyne Raman Spectrometer For Transmission Raman Spectroscopy And Standoff Detection, Kimberly A. Fessler
Wide Field Measurements Using A Spatial Heterodyne Raman Spectrometer For Transmission Raman Spectroscopy And Standoff Detection, Kimberly A. Fessler
Theses and Dissertations
Our group recently developed a new type of Fourier transform Raman spectrometer, the spatial heterodyne Raman spectrometer (SHRS), for planetary exploration. The SHRS is a high spectral resolution, high throughput, compact dispersive interferometer, similar in design to a Michelson interferometer, where the mirrors are replaced by stationary diffraction gratings. The SHRS has no moving parts and does not require an entrance slit, making the throughput of the system orders of magnitude larger than a typical dispersive spectrometer. The wide field-of-view (FOV) of the SHRS enables wide area measurements without loss of sensitivity or spectral resolution and offers advantages such as …