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Multispectral microimager for astrobiology

Sellar, R. Glenn and Farmer, Jack D. and Kieta, Andrew and Huang, Julie (2006) Multispectral microimager for astrobiology. In: Instruments, Methods, and Missions for Astrobiology IX. Proceedings of SPIE. No.6309. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 63090E.

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A primary goal of the astrobiology program is the search for fossil records. The astrobiology exploration strategy calls for the location and return of samples indicative of environments conducive to life, and that best capture and preserve biomarkers. Successfully returning samples from environments conducive to life requires two primary capabilities: (1) in situ mapping of the mineralogy in order to determine whether the desired minerals are present; and (2) nondestructive screening of samples for additional in-situ testing and/or selection for return to laboratories for more in-depth examination. Two of the most powerful identification techniques are micro-imaging and visible/infrared spectroscopy. The design and test results are presented from a compact rugged instrument that combines micro-imaging and spectroscopic capability to provide in-situ analysis, mapping, and sample screening capabilities. Accurate reflectance spectra should be a measure of reflectance as a function of wavelength only. Other compact multispectral microimagers use separate LEDs (light-emitting diodes) for each wavelength and therefore vary the angles of illumination when changing wavelengths. When observing a specularly-reflecting sample, this produces grossly inaccurate spectra due to the variation in the angle of illumination. An advanced design and test results are presented for a multispectral microimager which demonstrates two key advances relative to previous LED-based microimagers: (i) acquisition of actual reflectance spectra in which the flux is a function of wavelength only, rather than a function of both wavelength and illumination geometry; and (ii) increase in the number of spectral bands to eight bands covering a spectral range of 468 to 975 nm.

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Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This research was funded by the NASA’s Astrobiology Science and Technology Instrumentation Development program under task number 40-9725.
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Subject Keywords:Multispectral imager, microimager, astrobiology
Series Name:Proceedings of SPIE
Issue or Number:6309
Record Number:CaltechAUTHORS:20191106-133802715
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Official Citation:R. Glenn Sellar, Jack D. Farmer, Andrew Kieta, and Julie Huang "Multispectral microimager for astrobiology", Proc. SPIE 6309, Instruments, Methods, and Missions for Astrobiology IX, 63090E (14 September 2006);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99702
Deposited By: Tony Diaz
Deposited On:06 Nov 2019 22:20
Last Modified:16 Nov 2021 17:48

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