The instrument had a field of view of one steradian.

A steradian can also be called a squared radian.

For example, radiant intensity can be measured in watts per steradian (W sr-1).

That gives you a density of around ten to the twenty - twenty zeros - watts per steradian."

Steradian (the "square radian")

The SI unit of radiant intensity is watts per steradian (W sr).

Compiling Kikuchi maps which cover more than a steradian requires that one take many images at tilts changed only incrementally (e.g. by 2 in each direction).

The Raman cross section for the vibration of the aromatic ring in Toluene around 1000 cm is on the order of 10cm/molecule steradian.

Analogous to one degree being equal to π /180 radians, a square degree is equal to (π /180) or about 1/3283 steradian.

One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian.

The steradian was formerly an SI supplementary unit, but this category was abolished from the SI in 1995 and the steradian is now considered an SI derived unit.

By definition, if one constructs a light source that emits monochromatic green light with a frequency of 540 THz, and that has a radiant intensity of 1/683 watts per steradian in a given direction, that light source will emit one candela in the specified direction.