Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 18
Articles | Volume 18, issue 18
https://doi.org/10.5194/amt-18-4593-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-4593-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 18
Research article
 | 
18 Sep 2025
Research article |  | 18 Sep 2025

JLH Mark2 – An Improved Opto-Mechanical Approach to Open-Path in situ Water Vapor Measurement in the Upper Troposphere/Lower Stratosphere

Robert L. Herman, Robert F. Troy, Kim M. Aaron, Isabelle Sanders, Kevin Schwarm, Joshua Eric Klobas, Aaron Swanson, Andrew Carpenter, Scott Ozog, Keith Chin, Lance E. Christensen, Dejian Fu, Robert F. Jarnot, Robert A. Stachnik, and Ramabhadran Vasudev

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Short summary
This paper presents a new opto-mechanical design for an airborne atmospheric water vapor sensor, the Jet Propulsion Laboratory Laser Hygrometer (JLH) Mark2. The design maximizes instrument optical stability over the wide range of temperatures experienced during flight. We demonstrate that key changes in the redesigned instrument have significantly improved the performance and precision of water vapor measurements. We did this research to enable improved scientific instrumentation for aircraft.
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