Spectral reflectance properties of zeolites and remote sensing implications

Cloutis, E. A.; Asher, Pranoti M.; Mertzman, Stanley A.

doi:10.1029/2000je001467

Cited by 53 publications

(53 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The drop in the transmitted intensity for the dry, water, and ice spectra at 1650-1700 nm shown in Figs. 3(a) and 3(b) (water and ice alone) can be attributed to first-order overtones and combinations of various C-H stretching fundamentals [8] that appear distinctively for asphalts with high bitumen content. This also affects the transparent media water and ice, so this is not an effect of spectrometer.…”

Section: Discussionmentioning

confidence: 99%

Angular spectral response from covered asphalt

Casselgren

Sjödahl²,

LeBlanc³

2007

Appl. Opt.

View full text Add to dashboard Cite

By measuring the spectral reflection from the four different road conditions dry, wet, icy, and snowy asphalt, a method of classification for the different surfaces-using two and three wavelengths-is developed. The method is tested against measurements to ascertain the probability of wrong classification between the surfaces. From the angular spectral response, the fact that asphalt and snow are diffuse reflectors and water and ice are reflective are confirmed.

show abstract

Section: Discussionmentioning

confidence: 99%

Angular spectral response from covered asphalt

Casselgren

Sjödahl²,

LeBlanc³

2007

Appl. Opt.

View full text Add to dashboard Cite

show abstract

“…ROI A06_001 lies within the high albedo bright-toned unit, and exhibits a flat spectrum with no absorption features (Fig. 6C), potentially indicative of alteration minerals such as gypsum, opaline silica, zeolites, or magnesium sulfate (Hunt and Ashley, 1979;Cloutis et al, 2002;Ehlmann et al, 2012). The AUPE-2 R ⁄ spectra for this ROI accurately captured this spectral profile at all wavelengths as identified with the corresponding spectrometer field measurement except for the 440 nm value.…”

Section: Contextual Mineralogy and Field Observationsmentioning

confidence: 94%

Remote detection of past habitability at Mars-analogue hydrothermal alteration terrains using an ExoMars Panoramic Camera emulator

Harris

Cousins

Gunn

et al. 2015

Icarus

View full text Add to dashboard Cite

This paper is dedicated to the late Prof. Dave Barnes who sadly passed away before the publication of this work, to which he had significantly contributed over the years through his work on the ExoMars PanCamA major scientific goal of the European Space Agency?s ExoMars 2018 rover is to identify evidence of life within the martian rock record. Key to this objective is the remote detection of geological substrates that are indicative of past habitable environments, which will rely on visual (stereo wide-angle, and high resolution images) and multispectral (440?1000 nm) data produced by the Panoramic Camera (PanCam) instrument. We deployed a PanCam emulator at four hydrothermal sites in the N?mafjall volcanic region of Iceland, a Mars-analogue hydrothermal alteration terrain. At these sites, sustained acidic?neutral aqueous interaction with basaltic substrates (crystalline and sedimentary) has produced phyllosilicate, ferric oxide, and sulfate-rich alteration soils, and secondary mineral deposits including gypsum veins and zeolite amygdales. PanCam emulator datasets from these sites were complemented with (i) NERC Airborne Research and Survey Facility aerial hyperspectral images of the study area; (ii) in situ reflectance spectroscopy (400?1000 nm) of PanCam spectral targets; (iii) laboratory X-ray Diffraction, and (iv) laboratory VNIR (350?2500 nm) spectroscopy of target samples to identify their bulk mineralogy and spectral properties. The mineral assemblages and palaeoenvironments characterised here are analogous to neutral?acidic alteration terrains on Mars, such as at Mawrth Vallis and Gusev Crater. Combined multispectral and High Resolution Camera datasets were found to be effective at capturing features of astrobiological importance, such as secondary gypsum and zeolite mineral veins, and phyllosilicate-rich substrates. Our field observations with the PanCam emulator also uncovered stray light problems which are most significant in the NIR wavelengths and investigations are being undertaken to ensure that the flight model PanCam cameras are not similarly affectedpublishersversionPeer reviewe

show abstract

“…Extrinsic absorption in the polymer is due to external impurities like absorbed water. This can be detected by spectroscopy analysis as changes in hydroxyl (O-H) peaks at 1400 and 1900 nm [10], [11]. The overlap of the tails of different absorption peaks makes the contribution of absorption loss significant to the overall optical loss of the waveguide.…”

Section: Optical Loss Mechanismsmentioning

confidence: 99%

Thermal Aging Reliability of Package-Level Polymer Optical Waveguides

Hegde

Sitaraman

2008

IEEE Trans. Adv. Packag.

View full text Add to dashboard Cite

Polymer optical waveguides are viewed as a potential interconnect solution in board-level optoelectronic systems. In this paper, the optical loss changes in siloxane polymer waveguides during thermal aging conditions are studied for the wavelengths of 850 and 1310 nm. The optical loss in waveguides during intended operation and temperature exposure can increase due to factors such as oxidation of waveguides, increased absorption, and scattering. In addition to these inherent changes in the optical properties of the waveguides, physical failures such as delamination and cracking of waveguides will also increase the optical loss. This paper focuses on the first set of parameters that affects the optical loss and as a first step; the optical absorption of the polymer material is characterized through spectroscopy experiments. The thermal-aging dependent optical loss is determined for waveguide samples at several different accelerated temperature conditions. The temperature contours in a polymer waveguide with an embedded laser are determined from experiments as well as finite-element modeling. Using experimental data, analytical models have been developed that relate the optical loss with temperature and time, and provide a practical way of determining the reliability of the optical waveguides during field-use conditions.

show abstract

Spectral reflectance properties of zeolites and remote sensing implications

Cited by 53 publications

References 47 publications

Angular spectral response from covered asphalt

Angular spectral response from covered asphalt

Remote detection of past habitability at Mars-analogue hydrothermal alteration terrains using an ExoMars Panoramic Camera emulator

Thermal Aging Reliability of Package-Level Polymer Optical Waveguides

Contact Info

Product

Resources

About