Photodetector vs. Photosensor: Infrared Light & Point Source

[Alvin]

Help! is a photo detector the same as photosensor? can they be specifically for infrared light? and what does point source mean?

 

[inha]

Well point source means exactly that. A point-like source of radiation. I'd say they are the same, but it might depend on the context. And yeah, you can usually get a detector specifically for your region of interest in the em spectrum.

 

[Alvin]

so does point sourc light spread out? so that the intensity is inversly proportional to the square of the distance from source?

 

[MK1SX]

please could you tell me what is the symbol for a infrared source and detector?

thanks
Adam

 

[inha]

so does point sourc light spread out? so that the intensity is inversly proportional to the square of the distance from source?

yes that's right.