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Radiant intensity
 
 
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In radiometry
Radiometry

In optics, radiometry is the field that studies the measurement of electromagnetic radiation, including visible light. Note that light is also measured using the techniques of photometry_, which deal with brightness as perceived by the human eye, rather than absolute power....
, radiant intensity is a measure of the intensity of electromagnetic radiation
Electromagnetic radiation

Electromagnetic radiation takes the form of wave propagation waves in a vacuum or in matter. EM radiation has an electric field and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy Wave propagation....
. It is defined as power
Power (physics)

In physics, power is the rate at which mechanical work is performed or energy is transmitted, or the amount of energy required or expended for a given unit of time....
 per unit solid angle
Solid angle

The solid angle, O, is the angle in three-dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point....
. The SI
Si

Si, si, or SI may refer to :...
 unit of radiant intensity is watt
WATT

WATT is a radio station broadcasting a News radio-Talk radio-Sports radio format. Licensed to Cadillac, Michigan, it first began broadcasting in 1945....
s per steradian
Steradian

The steradian is the SI unit of solid angle. It is used to describe two-dimensional angular spans in three-dimensional space, analogous to the way in which the radian describes angles in a Plane ....
  (W·sr-1). Radiant intensity is distinct from irradiance
Irradiance

Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power of electromagnetic radiation at a surface, per unit area....
 and radiant exitance, which are often called intensity
Intensity (physics)

In physics, intensity is a Measurement of the time averaging energy flux. The word "intensity" here is not synonymous with "wikt:strength", "wikt:amplitude", or "wikt:level", as it sometimes is in colloquial speech....
 in branches of physics other than radiometry.








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In radiometry
Radiometry

In optics, radiometry is the field that studies the measurement of electromagnetic radiation, including visible light. Note that light is also measured using the techniques of photometry_, which deal with brightness as perceived by the human eye, rather than absolute power....
, radiant intensity is a measure of the intensity of electromagnetic radiation
Electromagnetic radiation

Electromagnetic radiation takes the form of wave propagation waves in a vacuum or in matter. EM radiation has an electric field and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy Wave propagation....
. It is defined as power
Power (physics)

In physics, power is the rate at which mechanical work is performed or energy is transmitted, or the amount of energy required or expended for a given unit of time....
 per unit solid angle
Solid angle

The solid angle, O, is the angle in three-dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point....
. The SI
Si

Si, si, or SI may refer to :...
 unit of radiant intensity is watt
WATT

WATT is a radio station broadcasting a News radio-Talk radio-Sports radio format. Licensed to Cadillac, Michigan, it first began broadcasting in 1945....
s per steradian
Steradian

The steradian is the SI unit of solid angle. It is used to describe two-dimensional angular spans in three-dimensional space, analogous to the way in which the radian describes angles in a Plane ....
  (W·sr-1). Radiant intensity is distinct from irradiance
Irradiance

Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power of electromagnetic radiation at a surface, per unit area....
 and radiant exitance, which are often called intensity
Intensity (physics)

In physics, intensity is a Measurement of the time averaging energy flux. The word "intensity" here is not synonymous with "wikt:strength", "wikt:amplitude", or "wikt:level", as it sometimes is in colloquial speech....
 in branches of physics other than radiometry.

See also

  • Candela
    Candela

    The candela is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function ....
  • Luminous intensity
    Luminous intensity

    In Photometry , luminous intensity is a measure of the wavelength-weighted Power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye....