Photodetector vs. Photosensor: Infrared Light & Point Source

AI Thread Summary
A photodetector and a photosensor can be considered similar, but their definitions may vary based on context. A point source refers to a radiation source that emits light from a single, localized point, and the intensity of light from such a source diminishes inversely with the square of the distance from it. Infrared light can be detected using specialized detectors designed for specific regions of the electromagnetic spectrum. The discussion also touches on the symbols used for infrared sources and detectors, although specific symbols were not provided. Understanding these concepts is crucial for applications involving infrared light detection.
Alvin
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Help! is a photo detector the same as photosensor? can they be specifically for infrared light? and what does point source mean?
 
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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.
 
so does point sourc light spread out? so that the intensity is inversly proportional to the square of the distance from source?
 
please could you tell me what is the symbol for a infrared source and detector?

thanks
Adam
 
Alvin said:
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.
 

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