A new approach to locating gas and vapor plumes is proposed that is entirely passive. By modulating the transmission waveband of a narrow-band filter, an intensity modulation is established that allows regions of an image to be identified as containing a specific gas with absorption characteristics aligned with the filter. A system built from readily available components was constructed to identify regions of NO. Initial results show that this technique was able to distinguish an absorption cell containing NO gas in a test scene.
Bibliographical noteBenton, David M., "Technique for passive scene imaging of gas and vapor plumes using transmission-waveband modulation," Optical engineering, 51(5) 050501 (2012).
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- dielectric filters
- image processing