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Help me design a laser smoke detector

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grkmr

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Hi all,

I am responsible for designing a smoke detector that detects smoke with the help of a laser. It must detect and seperate smoke from the other solid objects.
I have no clue about how to start. Anyone wants to help me?
 

I suggest you look into photoelectric (optical) smoke detectors. There are 2 main types of these, simple IR/LED units that look like a typical ionization type detector found in homes and beam type detectors that have either a separate emitter/collector or combine both in one unit with a mirror at the other side of the monitored area. I imagine you could design one to alarm when the beam is partially obscured by smoke (so as not to trigger on a solid object) but a can't conceive a way to distinguish thick smoke from a solid object optically other than perhaps using multiple beams.
 
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