Near-ultraviolet Incoherent Broadband Cavity Enhanced Absorption Spectroscopy for OClO and CH2O in Cl-initiated Photooxidation Experiment

Dong, Meili; Zhao, Weixiong; Huang, Mingqiang; Chen, Wei‐dong; Hu, Changjin; Gu, Xuejun; Pei, Shixin; Huang, Wei; Zhang, Weijun

doi:10.1063/1674-0068/26/02/133-139

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…For this reason, high stability of an IBBCEAS instrument is highly required for high-accuracy measurements of aerosol extinction such that the background drift could be negligible in comparison with the measured aerosol extinction. Mirror reflectivity R(λ) of the albedometer was determined by introducing gases with different Rayleigh cross sections Washenfelder et al, 2008;Zhao et al, 2013;Dong et al, 2013). In this work, the R(λ) was determined from the difference in the transmitted intensities of N 2 and SF 6 .…”

Section: Data Retrieval Processingmentioning

confidence: 99%

Development of a cavity-enhanced aerosol albedometer

Zhao

Dong

et al. 2014

Atmos. Meas. Tech.

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Abstract. We report on the development of a cavityenhanced aerosol single-scattering albedometer based on incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) combined with an integrating sphere (IS) for simultaneous in situ measurements of aerosol scattering and extinction coefficients in an exact same sample volume. The cavity-enhanced albedometer employed a blue light-emitting-diode (LED)-based IBBCEAS approach for the measurement of wavelength-resolved aerosol optical extinction over the spectral range of 445-480 nm and an integrating sphere nephelometer coupled to the IBBCEAS setup for the measurement of aerosol scattering. The scattering signal was measured with a single-channel photomultiplier tube (PMT), providing an averaged value over a narrow bandwidth (full-width at half-maximum, FWHM, ∼ 9 nm) in the spectral region of 465-474 nm. A scattering coefficient at a wavelength of 470 nm was deduced as an averaged scattering value over the spectral region of 465-474 nm and used for data analysis and instrumental performance comparison. Performance evaluation of the albedometer was carried out using laboratory-generated particles and ambient aerosol. The scattering and extinction measurements of monodisperse polystyrene latex (PSL) spheres generated in the laboratory proved excellent correlation between two channels of the albedometer. The retrieved refractive index (RI) of the PSL particles from the measured scattering and extinction efficiencies agreed well with the values reported in previously published papers. Aerosol light scattering and extinction coefficients, single-scattering albedo (SSA) and NO 2 concentrations in an ambient sample were directly and simultaneously measured using the albedometer developed. The instrument developed was validated via an intercomparison of the measured aerosol scattering coefficients and NO 2 trace gas concentrations to a TSI 3563 integrating nephelometer and a chemiluminescence detector, respectively.

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Section: Data Retrieval Processingmentioning

confidence: 99%

Development of a cavity-enhanced aerosol albedometer

Zhao

Dong

et al. 2014

Atmos. Meas. Tech.

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“…Mirror reflectivity R(λ) of the albedometer was determined by introducing gases with different Rayleigh cross sections (Moosmüller et al, 2005;Washenfelder et al, 2008;Zhao et al, 2013;Dong et al, 2013). In this work, the R(λ) was determined from the difference in the transmitted intensities of N 2 and SF 6 .…”

Section: Data Retrieval Processingmentioning

confidence: 99%

Development of a cavity enhanced aerosol albedometer

Zhao¹,

Xu²,

Dong³

et al. 2014

Preprint

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Abstract. We report on the development of a cavity enhanced aerosol single scattering albedometer incorporating incoherent broad-band cavity-enhanced spectroscopy (IBBCEAS) approach and an integrating sphere (IS) for simultaneous in situ measurements of aerosol scattering and extinction coefficients in the exact same sample volume. The cavity enhanced albedometer employed a blue light-emitting diode (LED) based IBBCEAS approach for the measurement of wavelength-resolved aerosol optical extinction over the spectral range of 445–480 nm. An integrating sphere nephelometer coupled to the IBBCEAS setup was used for the measurement of aerosol scattering. The scattering signal was measured with a single channel photomultiplier tube (PMT), providing an integrated value over a narrow bandwidth (FWHM ~ 9 nm) in the spectral region of 465–474 nm. A scattering coefficient at a wavelength of 470 nm was deduced as an averaged scattering value and used for data analysis and instrumental performance comparison. Performance evaluation of the albedometer was carried out using laboratory-generated particles and ambient aerosol. The scattering and extinction measurements of monodisperse polystyrene latex (PSL) spheres generated in laboratory proved excellent correlation between two channels of the albedometer. The retrieved refractive index (RI) from the measured scattering and extinction efficiencies agreed well with the values reported in previously published papers. Aerosol light scattering and extinction coefficients, single scattering albedo (SSA) and NO2 concentrations in an ambient sample were directly and simultaneously measured using the developed albedometer. The developed instrument was validated via an intercomparison of the measured aerosol scattering coefficient and NO2 trace concentration against a TSI 3563 integrating nephelometer and a chemiluminescence detector, respectively.

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“…Related techniques often add the light source type in front of the acronym (Light Emitting Diode (LED, [ 20 ]), Interband Cascade Laser (ICL), or Optical Feedback (OF)). BBCEAS and related techniques have been used to measure species including: NO 2 [ 20 , 21 , 22 , 23 ], NO 3 [ 20 , 24 ], H 2 O [ 23 ], O 3 [ 23 , 25 ], glyoxal [ 22 , 23 , 26 ], methyl glyoxal [ 23 ], biacetyl [ 26 ], IO [ 23 ], I 2 [ 20 , 27 ], OIO [ 28 ], OClO [ 29 ], ClOOCl [ 30 ], BrO [ 31 ], HONO [ 32 ], HCHO [ 29 , 33 ], BTEX (benzene, toluene, ethyl benzene, and xylenes) compounds [ 34 ], and O 4 [ 20 , 35 ] in the UV and visible regions of the spectrum as well as other compounds in the near-IR and IR using related techniques such as Cavity Ring-down Spectroscopy (CRDS) [ 36 ], Integrated Cavity Output Spectroscopy (ICOS) [ 37 ], and Cavity Attenuated Phase Shift Spectroscopy (CAPS) [ 38 ]. SO 2 was recently measured using OF-CEAS at 4.035

m with a detection limit of 130 ppbv [ 39 ] and CRDS in the UV with a detection limit of 3.5 ppbv in 10 s [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)

Thalman

Bhardwaj

Flowerday

et al. 2022

Sensors

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Sulfur dioxide (SO2) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum limit of detection of 0.75 ppbv (3-σ) using the spectral range 305.5–312 nm and an averaging time of 5 min. The instrument consists of high-reflectivity mirrors (0.9985 at 310 nm) and a deep UV light source (Light Emitting Diode). The effective absorption path length of the instrument is 610 m with a 0.966 m base length. Published reference absorption cross sections were used to fit and retrieve the SO2 concentrations and were compared to fluorescence standard measurements for SO2. The comparison was well correlated, R2 = 0.9998 with a correlation slope of 1.04. Interferences for fluorescence measurements were tested and the BBCEAS showed no interference, while ambient measurements responded similarly to standard measurement techniques.

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Near-ultraviolet Incoherent Broadband Cavity Enhanced Absorption Spectroscopy for OClO and CH2O in Cl-initiated Photooxidation Experiment

Cited by 8 publications

References 28 publications

Development of a cavity-enhanced aerosol albedometer

Development of a cavity-enhanced aerosol albedometer

Development of a cavity enhanced aerosol albedometer

Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)

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