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Reasons to pulse an IR source

  1. Dec 15, 2009 #1
    At my business we are beginning the design of gas detection systems using IR. My question is what are the benefits of operating solid state IR sources in a pulsed mode?
  2. jcsd
  3. Dec 15, 2009 #2
    Are you using FTIR spectrometer? if not can you give little information about the lab setup to have better understanding?
  4. Dec 15, 2009 #3


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    Staff: Mentor

    It is mainly for noise reduction. You modulate the IR source at some frequency, and mix the received signal with the same frequency (in I and Q often) to measure the received signal strength. You filter strongly around the modulation frequency in the receiver, to help reduce noise pickup from DC, lights, etc.

    If you wiki IR remote control, you will see how it's done in typical applications.
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