blackbody


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  • noun

Synonyms for blackbody

a hypothetical object capable of absorbing all the electromagnetic radiation falling on it

References in periodicals archive ?
Hence, the heat flux measured by the sensor contains contributions from the direct radiation from the blackbody aperture and the radiation reflected from the inner surface of the graphite tube extension.
Known as the Balloon Anisotropy Measurement, this survey employs a spectrometer, a device normally used to study how closely the intensity of the microwave background at different wavelengths matches a perfect blackbody spectrum.
1]) is Planck's constant, T (K) is the blackbody temperature, k (~1.
1] (25 [micro]m)--the radiance is higher, since it primarily comes from emission in the lowest few layers of the atmosphere near the surface and follows the typical emission curve of a blackbody at a temperature near the instrument, as shown, in the case of spring time, by the green curves of Fig.
One of the puzzling results of the calibrations was that, for each instrument, the brightness temperature of its internal calibration target (ICT), determined radiometrically by the instrument itself after it had been calibrated against ITT's laboratory blackbody, differed from its temperature as indicated by the PRTs embedded in it.
Hasenohrl's error, they believe, stems from failing to account for the mass lost by the blackbody while radiating.
In practical measurement, we need to use the calibration target to calibrate the blackbody which we study.
The first key insight was that closed trapped surfaces, discovered by Roger Penrose in the black hole case, would occur in a time reversed sense in cosmology; and the second was that one could show such closed trapped surfaces would exist because of the existence of the cosmic microwave blackbody radiation.
Subsequent chapters, of course, delve into the specifics, in three groupings pertaining to blackbody radiative properties, radiative exchange in enclosures without any radiating medium between the surfaces, and the radiative properties of gases.
But I thought that classical physics fell precisely due to the "ultraviolet catastrophe" when the Rayleigh-Jeans formula failed to predict the drop in frequency of blackbody radiation at higher temperatures.
The system is based on a Thermoteknix thermal imaging camera working in conjunction with a blackbody calibration unit for high accuracy temperature measurement and with the option of a colour visible video camera display for simultaneous subject visual identification.
Sample this: Planck getting up in the middle of the night to post a note with the equation for the blackbody spectrum.
The PIRELC, a high-output emitter from Cal Sensors can be used as a steady state or pulsed source of blackbody radiation for near-to-far infrared applications.
When you thermographically calibrate an IR system, you are completing measurements based on effective blackbody radiance and temperature.
This structured emission is easily distinguished from the featureless blackbody radiation of the underlying material stream.