Radiant Intensity

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radiant intensity

[′rād·ē·ənt in′ten·səd·ē]
The energy emitted per unit time per unit solid angle about the direction considered; usually expressed in watts per steradian.

Radiant Intensity


a radiometric unit that characterizes the radiation from a source in a certain direction. Radiant intensity is equal to the ratio of the radiant flux emitted by the source in an infinitesimal solid angle containing the direction considered to the solid angle. The concept of radiant intensity is applicable at distances from the source that greatly exceed the source’s dimensions. The unit of radiant intensity is watts per steradian.

References in periodicals archive ?
This is explained by the positive radiant intensity gradient emitted on the floor by the tube-reflector assembly which is a function of the tube temperature distribution.
The negative sign of the radiant intensity variables was indicated by increasing emitter temperature and reducing distance between emitter and absorbing surface, the air temperature had wide range of distribution.
The SFH 4725S achieves a radiant intensity of 450 mW/sr at an emission angle of 90 deg, providing illumination over the area being monitored.
The dry-bulb temperature is easily measured, while the mean radiant temperature can be calculated either by the classic method using surface temperatures and view factors as described in the ASHRAE Handbook--Fundamentals (2001) or by the radiant intensity method presented by Chapman and DeGreef (1997).
0] is the radiant intensity of the source and [DELTA](Q) is a second-order approximation of the path difference ([P.
The beam angle and radiant intensity can be varied with standard secondary optics which are readily available on the market.
From a current of 1A, it achieves a total radiated power of 430mW and therefore a radiant intensity of 2.
blackbody, [epsilon) = 1) with the same radiant intensity as the test surface at a specified wavelength.
These new IR emitters are fabricated using the company's high-power aluminum gallium arsenide (AlGaAs) LED technology, which has been optimized for high radiant intensity, speed and low forward voltage.
The IR emitter's wider angle in the horizontal view helps maintain position flexibility for users, while the narrower angle in the vertical plane focuses the distributed radiant intensity.
12] hertz and that has a radiant intensity in that direction of 1/683 watts per steradian.
In remote control operation, the transceiver features wide transmission angle (30 degrees minimum) and high radiant intensity (40 mW/sr typical) to make it easy to aim.