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Semiactive infrared remote sensing: a practical prototype and field comparison.

Timothy J Johnson1, Bruce A Roberts, James F Kelly

  • 1Pacific Northwest National Laboratory, PO Box 999, Richland, Washington 99352, USA. timothy.johnson@pnl.gov

Applied Optics
|February 10, 2004
PubMed
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A new semiactive Fourier-transform infrared (FTIR) remote sensing method uses a heated broadband source for improved gas detection. This technique offers a balance between active and passive methods, enhancing sensitivity for environmental monitoring.

Area of Science:

  • Environmental Science
  • Spectroscopy
  • Remote Sensing Technology

Background:

  • Active and passive Fourier-transform infrared (FTIR) remote sensing methods have limitations in sensitivity and complexity.
  • There is a need for improved FTIR techniques for detecting gases like carbon monoxide (CO) in the environment.

Purpose of the Study:

  • To develop and field-test a novel semiactive FTIR remote sensing method.
  • To evaluate the sensitivity and practicality of the new method compared to existing techniques.

Main Methods:

  • A semiactive FTIR approach was developed, replacing the sender telescope of active systems with an extended, heated broadband source (commercial griddle).
  • The uncollimated source output simplifies alignment, with detector optics pointed directly at the griddle.

Related Experiment Videos

  • The griddle source fills the detector's field of view at 100 m and is maintained at ~80 K above ambient temperature.

    • Main Results:

    • Field tests involved live carbon monoxide (CO) releases.
    • The semiactive method demonstrated approximately 30 times less sensitivity than active FTIR methods.
    • However, it showed approximately 30 times greater sensitivity than passive FTIR methods, particularly in the midwave infrared spectrum.

    Conclusions:

    • The developed semiactive FTIR method offers a practical and sensitive approach for gas remote sensing.
    • This technique provides a valuable intermediate sensitivity between active and passive methods.
    • The simplicity of alignment and enhanced midwave infrared sensitivity make it suitable for environmental monitoring applications.