نتایج جستجو برای: infrared spectral
تعداد نتایج: 257728 فیلتر نتایج به سال:
A method is developed to show that instead of using data from the entire spectrum, only selected spectral bands are required to improve image reconstruction accuracy in spectral diffuse optical tomography. ©2007 Optical Society of America OCIS codes: (100.3190) Inverse problems; (170.3660) Light propagation in tissues;
The Spitzer Infrared Nearby Galaxies Survey (SINGS) is carrying out a comprehensive multiwavelength survey on a sample of 75 nearby galaxies. The 1–850 m spectral energy distributions (SEDs) are presented using broadband imaging data from Spitzer, 2MASS, ISO, IRAS, and SCUBA. The infrared colors derived from the globally integrated Spitzer data are generally consistent with the previous generat...
We use near-infrared photometry of objects detected by IRAS to confirm four new T Tauri stars in Chamaeleon II. Observations of these sources generally agree with the T Tauri signatures of locus in the near-infrared color-color diagram, midinfrared spectral index, and IRAS far-infrared colors. Infrared properties of these stars are similar to optically selected T Tauri stars in Cha II, but are ...
We describe the use of a combined gas chromatographic/infrared/mass spectrometric system to identify some common, clinically important drugs. Sensitivity for the serially configured combined system is demonstrated to be in the low nanogram range for strong infrared-absorbing compounds. Linearity for cocaine in the infrared detector was shown to have a correlation coefficient of 0.9914. Vapor-ph...
Hyperspectral imagery from the airborne multispectral scanner was evaluated for discrimination and mapping of vegetation components in a semi-arid rangeland environment in Southern Australia. Automated unmixing of two image strips with 5-m resolution revealed several vegetation endmembers in the visible, near infrared (near-IR), and short-wave infrared portions of the imagery. Identity of the e...
We present here near-infrared spectroscopy in the H and K bands of a selection of nearly 80 stars that belong to various AGB types, namely S type, M type and SR type. This sample also includes 16 Post-AGB (PAGB) stars. From these spectra, we seek correlations between the equivalent widths of some important spectral signatures and the infrared colors that are indicative of mass loss. Repeated sp...
Introduction: The current understanding of lunar surface mineralogy largely comes from two sources: samples (Apollo and meteorite [e.g. 1]) and remote near-infrared spectroscopic measurements (telescopic and Clementine [e.g. 2]). Samples provide detailed compositional analysis of a limited number of sites across the lunar surface and NIR measurements provide global, high-resolution coverage of ...
We present experimental data showing a significant dependence of light absorption on temperature in photorefractive LiNbO3 :Fe crystals. The results are successfully explained by assuming that the widths of the Fe absorption bands in the visible and in the infrared spectral region depend on temperature. The findings are of relevance for thermal fixing of holograms. Furthermore, a temperature-in...
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