LIBS/RAMAN
GOAL: Creation of an integrated instrument capable of LIBS and Raman spectroscopy of surfaces at sub-100 μm spot size with laser delivery and spectra collection via optical fibers. LIBS utilizes a highly focused laser pulse to ablate a small amount of surface material and generate a plasma ball. During cooling of the plasma, atomic emission spectra are emitted, providing qualitative and quantitative information about the atomic composition of the material. Raman spectroscopy here makes use of the same laser at a lower, non-destructive power. The inelastic scatter of the laser light interacting with vibrational and rotational energy modes of molecules produces distinctive spectral signatures, providing information about the molecular composition of the surface.
Principal Investigator:
Christopher Dreyer, Colorado School of Mines
Institutional Principal Investigator:
Greg Mungas
Project Status:
-Developed three axis micron accuracy positioning for laser focusing and raster scanning of surfaces.
-Developed Mars simulation chamber for testing LIBS in low pressure Martian atmosphere environment.
-LIBS spot sizes of ~30 μm achieved with qualitative elemental analysis.
-Raman spectra obtained with LIBS capable laser and spectrometer.
-In development of improved laser delivery and collection optics probe head with better alignment capability and collection efficiency for enhanced trace element detection.
-In development of new, high accuracy quantitative LIBS analysis algorithm (see publications below).
Publications:
G.S. Mungas, C.B. Dreyer, A.J. Bauer, Elemental Abundance Measurement using Micro-LIBS for Space Exploration, Lunar and Planetary Science Conference XXXX #2264 (2009).G. Mungas, C. Dreyer, A. Bauer, Y. Gürsel, Multiple Emission Line Observational Algorithm and Calibration Measurement Requirements for Improving LIBS Accuracy, LIBS2008 Conference, Berlin, Germany Sept. 22 – 25 (2008).
C.B Dreyer, G.S Mungas, Micro-LIBS for Space Exploration, Earth and Space 2008, March 3-5, (2008).
G. Mungas. Temporally and Spatially Integrated Elemental Analysis Algorithm for Low Pressure Micro-LIBS Measurements. Applied Optics, Vol. 94, (19), (July 2007).
C.B. Dreyer, G. S. Mungas, P. Thanh, and J.G. Radziszewski. Study of Sub-mJ-Excited Laser Induced Plasma Combined with Raman Spectroscopy under Mars Atmosphere-Simulated Conditions. Spectrochimica Acta B, Vol. 62 (19), (2007).
C.B. Dreyer, and G. S. Mungas, Obscuration of optical transmission due to laser deposited material during micro-LIBS interrogation of a rock surface, Seventh International Conference on Mars #3382 (2007).
C. B. Dreyer, G. S. Mungas, Integrated Micro-LIBS, Raman Spectroscopy, and Microscope for Space Exploration, Lunar and Planetary Science Conference XXXVIII # 2307 (2007).
G. Mungas, E. Drumheller, and T. Fisher. Multiple Emission Line Elemental Analysis of LIBS Plasmas for Improved Measurement Accuracy. Laser Applications to Chemical, Security, and Environmental Analysis, Technical Digest (Optical Society of America), paper WA3, (2006).
Related Publications:
G. Mungas, Y. Gürsel, C. Sepulveda, C. La Baw, K. Johnson, M. Deans, L. Beegle, J. Boynton. Development and optical testing of the Camera, Hand lens, And Microscope Probe with Scannable Laser Spectroscopy (CHAMP-SLS). SPIE Optics and Photonics Paper #7060-23. (2008).G. Mungas, Y. Gürsel, C. B. Dreyer, C. S. Sepulveda, K. Johnson, J.E. Boynton, L. Beegle, Integrating micro-LIBS with the Camera, Handlens, and Microscope Probe for Space Exploration. Lunar and Planetary Science Conference XXXIX #2492 (2008).
G. Mungas, C. Sepulveda, K. Johnson, M. Pelletier, C. La Baw, J. Boynton, M. Anderson. Raman/CHAMP Instrument for Lunar In-situ Resource Prospecting, IEEE Aerospace Conference 2006, IEEEAC#1554.
J. Boynton, G. Mungas, C. Sepulveda, et. al., CHAMP – Camera, Hand lens, And Microscope Probe, IEEE Aerospace Conference 2005, IEEEAC#1510.
L. Pedersen, M. Deans, C. Kunz, R. Sargent, A. Chen, & G. Mungas, Inspection with Robotic Microscopic Imaging, AIAA 2005-6719. (2005).