Photodetector vs. Photosensor: Infrared Light & Point Source

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Discussion Overview

The discussion revolves around the definitions and distinctions between photodetectors and photosensors, particularly in the context of infrared light and point sources of radiation. Participants explore the implications of these terms and their applications in the electromagnetic spectrum.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants suggest that photodetectors and photosensors may be the same, but note that this could depend on the context.
  • One participant defines a point source as a point-like source of radiation.
  • There is a question regarding whether light from a point source spreads out, with a participant proposing that intensity is inversely proportional to the square of the distance from the source.
  • A request is made for the symbols representing infrared sources and detectors.
  • A later reply confirms the assertion about the intensity of light from a point source spreading out.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether photodetectors and photosensors are the same, indicating that multiple views remain on this topic. There is also a shared understanding regarding the behavior of light from point sources, but the discussion on definitions remains unresolved.

Contextual Notes

The discussion does not clarify the specific definitions of photodetectors and photosensors, nor does it address potential variations in their applications across different contexts.

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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