Preprints
https://doi.org/10.5194/amt-2024-61
https://doi.org/10.5194/amt-2024-61
30 May 2024
 | 30 May 2024
Status: this preprint is currently under review for the journal AMT.

A Portable Nitrogen Dioxide Instrument Using Cavity-Enhanced Absorption Spectroscopy

Steven A. Bailey, Reem A. Hannun, Andrew K. Swanson, and Thomas F. Hanisco

Abstract. The Portable (2.7 kg) Cavity-enhanced Absorption of Nitrogen Dioxide (PCAND) instrument for measuring in situ nitrogen dioxide (NO2) was developed using incoherent, broadband cavity-enhanced absorption spectroscopy (IBBCEAS). An LED light source centered at 408 nm was coupled to a cavity 15 cm in length, achieving an effective optical pathlength of ~520 m. Our precision was measured as 94 pptv (1 s). To date, we have flown this instrument on 3 balloon and 1 UAV test flights. This instrument records data to an SD card and outputs data (via an RS232 port) to external devices including a commercial radiosonde (iMet) for real-time data downlink.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Steven A. Bailey, Reem A. Hannun, Andrew K. Swanson, and Thomas F. Hanisco

Status: open (until 04 Jul 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2024-61', Anonymous Referee #2, 03 Jun 2024 reply
    • AC1: 'Reply on RC1', S.A. Bailey, 12 Jun 2024 reply
  • RC2: 'Comment on amt-2024-61', Anonymous Referee #3, 12 Jun 2024 reply
    • AC2: 'Reply on RC2', S.A. Bailey, 17 Jun 2024 reply
Steven A. Bailey, Reem A. Hannun, Andrew K. Swanson, and Thomas F. Hanisco
Steven A. Bailey, Reem A. Hannun, Andrew K. Swanson, and Thomas F. Hanisco

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Short summary
We have developed a portable, optically based instrument that measures NO2. It consumes less than 6 watts of power so can easily run off a small battery. This instrument has made both balloon and UAV flights. NO2 measurement results compare favorably with other known NO2 instruments. We find this instrument to be stable with repeatable results compared with calibration sources. Materials cost to build a single instrument is around $4 k. This number could be lowered with economies of scale.