Benefits of Pulsing an IR Source for Gas Detection Systems

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SUMMARY

The discussion focuses on the benefits of operating solid-state infrared (IR) sources in a pulsed mode for gas detection systems. Key advantages include significant noise reduction achieved by modulating the IR source at a specific frequency and mixing the received signal with the same frequency. This technique allows for effective filtering around the modulation frequency, minimizing interference from DC and ambient light. The use of FTIR spectrometers is also mentioned as a relevant tool in this context.

PREREQUISITES
  • Understanding of solid-state IR sources
  • Familiarity with gas detection systems
  • Knowledge of modulation techniques
  • Experience with FTIR spectrometers
NEXT STEPS
  • Research the principles of pulsed IR source operation
  • Learn about noise reduction techniques in gas detection
  • Explore the functionality of FTIR spectrometers
  • Investigate modulation frequency selection for IR applications
USEFUL FOR

Engineers and designers involved in gas detection system development, researchers in infrared technology, and professionals seeking to enhance signal processing in IR applications.

skuntz
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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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