نتایج جستجو برای: thermal emissivity

تعداد نتایج: 219051  

2004
Xuebao Wu Jun LI Yuanjing Zhu Paul Menzel Wenjian Zhang

This report reviews briefly the characteristics of high spectral resolution satellite infrared remote sensing. The paper also describes the use of EOS-Aqua AIRS measurements to characterize the surface properties important for IR thermal emission. Infrared rapid transmittance model is used for the sensitivity study of surface parameters and the atmospheric parameters from lower troposphere. Six...

2015
Naomi C. Sullivan Dragoslav Grbovic Fabio Alves

The main goal of this work is to optimize the emissivity of terahertz (THz) thermal sensors by deposition of a carbon thin film. Previously, these thermal sensors were designed to detect THz radiation utilizing metamaterials in a complicated optical probing scheme. We have repurposed them to absorb terahertz radiation, convert the radiation to heat, and convey that surface temperature as an inf...

2015
M. B. Giannini O. R. Belfiore C. Parente R. Santamaria

In this study, several methods to compute land surface temperatures (LST) from Landsat TM5 data are compared. Two different approaches are considered. An image based approach that takes into account atmospherically corrected data by using a dark object subtraction model (DOS-1) and computes the emissivity as NDVI function. The emissivity of a surface is controlled by such factors as water conte...

2012
Iryna Danilina Joshua Bandfield Stephen Warren

Thermal-infrared radiosity and heat-diffusion model for estimating sub-pixel radiant temperatures over the course of a day Iryna Danilina Chair of the Supervisory Committee: Professor Alan Gillespie Department of Earth and Space Sciences In temperature/emissivity estimation from remotely measured radiances the general assumption is that scene elements represented by pixels in fact have a single...

2012
Wael A Khamas Hrvoje Smodlaka Jessica Leach-Robinson Lauren Palmer

BACKGROUND Pinnipeds have a thick blubber layer and may have difficulty maintaining their body temperature during hot weather when on land. The skin is the main thermoregulatory conduit which emits excessive body heat. METHODS Thorough evaluation of the skin histology in three pinniped species; the California sea lion-Zalophus californianus, the Pacific harbor seal-Phoca vitulina richardsi, a...

2008
Stephen Walsh Larry Chilton Mark Tardiff Candace Metoyer

Detecting and identifying weak gaseous plumes using thermal imaging data is complicated by many factors. These include variability due to atmosphere, ground and plume temperature, and background clutter. This paper presents an analysis of one formulation of the physics-based radiance model, which describes at-sensor observed radiance. The background emissivity and plume/ground temperatures are ...

Journal: :Physical review letters 2004
Chiyan Luo Arvind Narayanaswamy Gang Chen J D Joannopoulos

A classical simulation of equilibrium thermal emissivity from dispersive, lossy photonic crystals is presented. Normal emission results consistent with those assuming Kirchoff's law are obtained; i.e., a photonic crystal does not emit more than what a blackbody does. Significant enhancement, however, can be achieved over the radiation intensity from a uniform slab, indicating the potential usef...

2004
G. Sória

A series of dual-angle and split-window algorithms is presented for estimating sea (SST) and land surface temperature (LST) from the Advanced Along-Track Scanning Radiometer (AATSR). The numerical values of the coefficients have been obtained from statistical regression method using synthetic data. The algorithms have been tested with simulated and real AATSR data. Comprehensive sensitivity and...

2003
F. P. Seelos R. E. Arvidson

Introduction: The objective of any linear spectral unmixing procedure is to determine the abundance at which the components represented in a predetermined end-member library are present in the observed target. This is done by modeling an observed spectrum as a linear combination of end-member spectra. Following the work of Ramsey and Christensen [1] and Feely and Christensen [2] linear unmixing...

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