Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 11
Articles | Volume 18, issue 11
https://doi.org/10.5194/amt-18-2537-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-2537-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 11
Research article
 | 
16 Jun 2025
Research article |  | 16 Jun 2025

On path length, beam divergence, and retroreflector array size in open-path FTIR spectroscopy

Cameron E. N. Power and Aldona Wiacek

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Short summary
The choice of path length and retroreflector array size in open-path Fourier transform infrared spectroscopy must be made with care.  Longer paths increase target gas absorption (lowering detection limits), and larger retroreflector arrays increase the return signal (improving retrieved concentration precision), but there are limitations to both. An optimum array size and path combination exists in each specific observational environment and application, as explored in this work.
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