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n
(Units) a measure of the amount of radiation emitted from a point expressed as the radiant flux per unit solid angle leaving this source. Symbol: Ie
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The optical output of this highly efficient emitter is 720 milliwatts (mW) at a current of 1 amp, with a radiant intensity of 1,000 milliwatts per steradian (mW/sr).
* A radiant intensity of typically 1,750 mW/sr at a current of 1 A.
* Radiant intensity of 2900 mW/sr at an operating current of 1 A.
With peak wavelength of ?p = 850 nm, the VSMY98545 offers high reliability, high radiant power, high radiant intensity, low forward voltage, and is designed for high drive currents up to 1 A (DC) and up to 5 A pulses.
First, we input a thermal radiant intensity difference between the target and background.
The HIR89-01C has a viewing angle of 30 deg and achieves a radiant intensity 55mW/sr at 70mA.
The variables [kappa] and [sigma] represent the absorption and extinction coefficients of the medium, respectively, and [mu], [xi], and [eta] are the directional cosines that describe the direction of the radiant intensity. The function [phi] is the scattering phase function, which is equal to 1 in isotropic scattering.
The spectral radiative transfer equation (RTE) can be simplified by Discrete Transfer Radiation approach which is the commonly used radiation model for HVAC applications this is done by Using ray-tracing technique to integrate radiant intensity along each ray:
[mu], [xi], and [eta] are the directional cosines that describes the direction of the radiant intensity. [PHI] is the scattering phase function which is equal to 1 in isotropic scattering.

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