Application of JETI Spectroradiometers specbos 1201 and specbos 1211
Radiant Intensity Calculation Using Irradiance Measurement
|The Radiant intensity (I) of a (point like) source can be obtained by measuring the Irradiance (E) in a certain distance. Afterwards the inverse square law has to be used to convert the Irradiance into Radiant intensity. The distance d between the measuring plane and the source has to be measured before.|
|The following figure shows the set up.|
Some conditions have to be matched to get a precise result:
|The Inverse square law reads as follows:|
It can be used for the radiometric (E,I), photometric (Eν,Iν) or spectral data (E(λ),I(λ)).