Benefits of Pulsing an IR Source for Gas Detection Systems

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Pulsing solid state IR sources in gas detection systems primarily benefits noise reduction by modulating the IR source at a specific frequency. This technique allows for the mixing of the received signal with the modulation frequency, enhancing the measurement of signal strength. By filtering around the modulation frequency, it effectively minimizes noise interference from DC and ambient light sources. The discussion also references the application of similar methods in IR remote controls as a practical example. Overall, pulsing IR sources can significantly improve the accuracy and reliability of gas detection systems.
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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?
 
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Are you using FTIR spectrometer? if not can you give little information about the lab setup to have better understanding?
 
skuntz said:
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?

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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