Radiance spectral

Fig. 2. Curves 1, 2, and 3 show the spectral radiance factor for equivalent coatings of separate toluenesulfonamide—melamine—formaldehyde Day-Glo pigments containing 0.5% of a dye, either Alberta Yellow, Rhodamine F5G, or Rhodamine B Extra. Curve 4 is for a bright nonfluorescent red-orange printing ink. The illuminant was Source C. A magnesium oxide-coated block was used as a comparison white.

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... 

Limb spectral calculations RFM-OFM limb radiance calculations agree to within a fraction of the MEPAS specified Noise Equivalent Spectral Radiance (NESR). 

Results of a comprehensive study of the absolute spectral radiance of the infrared emissions from methane—air expins have been reported (Ref 44). The spectral growth of these expanding flames was recorded with a time resolution of one msec in the spectral range 1.7— 5.0 microns. Time resolved spectra were obtained as a function of stoichiometry, nitrogen dilution and Halon dilution. Similar data are also available for coal dust-air explns. Additional applications of rapid scan IR spectroscopy are discussed in Ref 50. In this work, flare spectra (Mk45, LUU-2B and LUU-2B/B) in the 1.7-4.7 and 9—14 micron regions were studied. The Mk-45 and LUU-2B/B showed similar spectral character with Na and C02 emissions superimposed on a gray body continuum, while LUU-2B flares demonstrated variable emittance properties... 

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

Puriming (Xf = same in both cases) (Source Spectral Radiance was 1 x 10 W/cm2 nm) Ratio taken was BF... 

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.

A disappearing filament (Figure 8.7) pyrometer is a form of a spectral radiancy pyrometer, which is a device that evaluates... 

For maximum sensitivity, the wavelength of the infrared pyrometer should also be selected based on where the spectral radiancy changes most rapidly. For example, in the temperature range depicted in Figure 8.3, a frequency of 1.5 x 10u Hz (2 /im) will permit more precise temperature measurement than a frequency of 0.4 x 1014 Hz (7.5 /im). 

Fig. 15. Spectral response of thermopile pyranometer measuring total solar radiation is shown with thick black line. Spectral radiance (brightness) of the sky dome (blue line). The cut-off at 3000 nm means the radiometer will not respond to the infrared sky radiation that peaks at 7000...

See also photon flow, photon radiance, spectral radiance, spherical radiance. 

Figure 1. Comparison between the measured (----------) and calculated ( ) spectral radiance of...

In this review of the high pressure sodium lamp, emphasis is placed on evidence concerning the interaction of resonantly excited sodium atoms with sodium, mercury or xenon atoms, which modifies the spectral radiance of lamps to improve the color or efficacy. The influence of mercury and xenon buffer gases on tne thermal and electrical conductivities and hence on lamp efficacy are also indicated. 

Figure 1. The measured spectral radiance of a high pressure Na (HPS) lamp...

The flux through a spectrometer within a small spectral region is appropriately described by Eq. 3.1-1. In this book, the optical properties are usually related to wavenumbers (Eq. 3.1-9) by the spectral radiance Lc, (radiance per wavenumber), by the spectral optical conductance Gy (optical conductance per wavenumber), and by Ai>, the bandwidth of the instrument (in wavenumber units) ... 

A laser is a radiation source which produces a very high spectral radiance in a small spectral range at a fixed wavelength. A laser combines a radiation source with spectral isolation of its radiation - two important components of a spectrometer. The word laser is an acronym which stands for light amplification by stimulated emission of radiation. The essential elements of a laser are an active medium a pumping process to produce a population inversion and a suitable geometry or optical feedback elements (Moore et al., 1993). Most lasers are essentially Fabry-Perot interferometers whose cavities contain... 

Any object at a temperature above absolute zero emits thennal radiation, it is a thermal radiator. Ideally, its atoms or molecules are in a thennal equilibrium, the entire ensemble has a definite temperature. In contrast to lasers, thermal radiation sources produce non-coherent radiation. Its quanta have a random phase distribution, both spatially and temporarily. Planck s law defines the. spectral radiance of a black body the radiant power per solid angle, per area, and per wavelength L j (Eq. 3.3-2) or per wavenumber L j (Eq. 3.3-3) ... 

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