Blackbody spectral radiance

Figure 4.24. The Planck distribution law spectral radiance of blackbody radiation as a function of temperature and wavelength. (After Touloukian and DeWitt (1972). Plenum Press.)...

Black-and-white photography, fixation in, 19 213 Blackbody color of, 7 327 emittance from, 19 131-132 spectral radiance of, 24 453 Blackbody radiation law, 24 452 Blackbody responsivity, 19 132 Blackbody temperature sensor, 11 149-150 Black-box approach, to reliability modeling, 26 987-988, 990 Black copper, 16 144 Black crappie, common and scientific names, 3 187t... 

Comparing blackbody and SR brightness for IR microscopy Brightness, or spectral radiance, also called brilliance, is defined as... 

The radiative behavior of real materials generally falls short of blackbody behavior, depending on the material. Figure 8.5 shows the spectral radiancy of a real body is always less than that of a blackbody, and the deviation is inconsistent with wavelength.3 The spectral emissivity is defined as the ratio... 

Figure 8.5 Spectral radiancy of a blackbody, real bodies stainless steel (1400°C) and alumina (1200°C), and greybody approximations. Real body spectra were calculated based on emittance values from reference [5]. Greybody approximations (dot-dot-dashed lines) were based on emittances of 0.33 for alumina and 0.75 for stainless steel. The high emittance of stainless steel is a result of oxidation to form a rough iron oxide surface. The greybody approximation appears good for stainless steel and poor for alumina. This may not be the case for different temperatures where the most intense portion of the blackbody spectra shifts in wavelength the constancy of emittance differs in different regions of the spectrum.

This function calculates the spectral radiance of a blackbody ... 

Figure 10.39. The spectral radiance of a blackbody at various temperatures from top to bottom 2000, 1500, and 1000 K,...

FIGURE 7 Spectral radiance distributions of a blackbody radiator at three temperatures. [From Wyszecki, G., and Stiles, W. S. (1982). Color Science Concepts and Methods, Quantitative Data and Formulae, 2nd ed. Copyright 1982 John Wiley Sons, Inc. Reprinted by permission of John Wiley Sons, Inc.]... 

For a thermal radiation source, for example the blackbody radiator of Sect. 2.2 with a spectral energy density p, the spectral radiance L (v) is independent of and can be expressed by... 

Fig. 32. Spectral radiance of a blackbody at different wavelengths and temperaturss. Unpolarized energy emitted per projected surface unit within a spectral band of unit width 1 cm into a unit solid angle. In watts per cm per steradian.

Emissivity (symbol, s) - The ratio of a target surface s radiance to that of a blackbody at the same temperature, viewed from the same angle and over the same spectral interval a generic look-up value for a material. Values range from zero to 1.0. 

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