steradian


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ste·ra·di·an (sr),

(stĕ-rā'dē-ăn),
The unit of solid angle; the solid angle that encloses an area on the surface of a sphere equivalent to the square of the radius of the sphere.
[G. stereos, solid, + radion, radius]

steradian

(stē-rā′dē-ăn)
The unit of measurement of solid angles. It encloses an area on the surface of a sphere equal to the square of the radius of the sphere.
References in periodicals archive ?
Fluence rate is wholly non-directional and includes UV radiation over 4[pi] steradians; that is, all of the possible directions from which UV rays might originate are included, and the influence of UV radiation received by the specified point is independent of direction.
IDTs SenseVerse RADAR family offers all weather high resolution sensing and will enhance and complement human and computer vision, said Gireesh Rajendran, CEO of Steradian Semiconductor.
First, the Steradian still incorporates a notch filter to help ease problems associated with the typical 8-ft distance between the floor and the ceiling.
The Steradian processor (hereinafter, just "processor") has three main functions.
Legacy Focus ($5,400) Reviewed in #54 by KWN, follow-up review with Steradian processor ($888 if purchased with the Focus, $1,295 as a stand-alone unit) forthcoming.
I quickly checked the setting on my Steradian, and sure enough, one of the kids had turned the thing down.
The independent variables are [??](x, y, z) (in centimeters), E (in megaelectronvolts), and [??]([theta], [phi]) (in steradians).
The second factor was the apparent source size in steradians (sr), defined as the subtended solid angle of the source at the eye of the subject.
The four numbers are actually snapshots taken at a single frequency and single target attitude along the line of sight of four functions that vary over the entire 4[Pi] steradians of solid angle around the target.
per second in 4p steradians and shall be tuneable in the range 105 to 106
Objectives Non-uniform ring Non-uniform excitation excitation and non-uniform spacing Beamwidth 0.038 0.177 (Steradians) SLL (dB) -25.58 -18.36
where [[OMEGA].sub.b] is the beam size in steradians. The integrated flux density of a discrete source, in units of Janskys, maybe found by replacing [[OMEGA].sub.b] in (5) by [[OMEGA].sub.s], the source size in steradians.