A lightweight broadband cavity-enhanced spectrometer for NO2 measurement on uncrewed aerial vehicles

Womack, Caroline C.; Brown, Steven S.; Ciciora, Steven J.; Gao, Ru-Shan; McLaughlin, Richard J.; Robinson, Michael A.; Rudich, Yinon; Washenfelder, Rebecca A.

doi:10.5194/amt-15-6643-2022

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A lightweight broadband cavity-enhanced spectrometer for NO2 measurement on uncrewed aerial vehicles

2022
By Womack, Caroline C. ; Brown, Steven S. ; Ciciora, Steven J. ; ...
Source: Atmospheric Measurement Techniques, 15(22), 6643-6652

[PDF-2.69 MB]

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Details:

Journal Title:

Atmospheric Measurement Techniques
Personal Author:

Womack, Caroline C. ; Brown, Steven S. ; Ciciora, Steven J. ; Gao, Ru-Shan ; McLaughlin, Richard J. ; ... More +

Womack, Caroline C. ; Brown, Steven S. ; Ciciora, Steven J. ; Gao, Ru-Shan ; McLaughlin, Richard J. ; Robinson, Michael A. ; Rudich, Yinon ; Washenfelder, Rebecca A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory) Less -
Description:

Abstract. We describe the design and performance of a lightweight broadband cavity-enhanced spectrometer for measurement of NO2 on uncrewed aerial vehicles and light aircraft. The instrument uses a light-emittingdiode (LED) centered at 457 nm, high-finesse mirrors (reflectivity =0.999963 at 450 nm), and a grating spectrometer to determine optical extinction coefficients between 430 and 476 nm, which are fit with custom spectral fitting software and published absorption cross sections. The instrument weighs 3.05 kg and has a power consumption of less than 35 W at 25 ∘C. A ground calibration unit provides helium and zero air flows to periodically determine thereflectivity of the cavity mirrors using known Rayleigh scattering crosssections. The precision (1σ) for laboratory measurements is 43 pptNO2 in 1 s and 7 ppt NO2 in 30 s. Measurement of air with known NO2 mixing ratios in the range of 0–70 ppb agreed with the known values within 0.3 % (slope =0.997±0.007; r2=0.99983). We demonstrate instrument performance using vertical profiles of the NO2 mixing ratio acquired on board an uncrewed aerial vehicle between 0 and 110 m above ground level in Boulder, Colorado.
Keywords:

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Atmospheric Science
Source:

Atmospheric Measurement Techniques, 15(22), 6643-6652
DOI:

https://doi.org/10.5194/amt-15-6643-2022
ISSN:

1867-8548
Format:

PDF
Publisher:

Copernicus GmbH
Document Type:

Journal Article
Funding:

Grant no. NA17OAR4320101
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:ac5814730b4dc3e6802db7041391839962aad92b108acf6e11eb8af74d02ab36
Download URL:

https://repository.library.noaa.gov/view/noaa/49797/noaa_49797_DS1.pdf
File Type:

Machine readable version (XML)

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