Differential optical absorption spectroscopy system used for atmospheric mercury monitoring

Edner, Hans; Sunesson, Anders; Svanberg, Sune; Uneus, L.; Wallin, Svante

doi:10.1364/ao.25.000403

Cited by 70 publications

(16 citation statements)

References 21 publications

(8 reference statements)

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“…An alternative approach to the one described here is to replace the lamp telescopes with retroreflectors and to construct the transmitting lamp and receiving telescope as one unit.' 7 The practical and economical benefits of replacing active lamp telescopes with passive retroreflectors encourage the use of a larger number of retroreflectors, which would ensure optimum path lengths for all meteorological conditions. Rain does normally not affect the measurements if the windows are shielded, but fog can block the light if the path is long.…”

Section: Discussionmentioning

confidence: 99%

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Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring

et al. 1993

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We describe a fully computer-controlled differential optical absorption spectroscopy system for atmospheric air pollution monitoring. A receiving optical telescope can sequentially tune in to light beams from a number of distant high-pressure Xe lamp light sources to cover the area of a medium-sized city. A beam-finding servosystem and automatic gain control permit unattended long-time monitoring. Using an astronomical code, we can also search and track celestial sources. Selected wavelength regions are rapidly and repetitively swept by a monochromator to sensitively record the atmospheric absorption spectrum while avoiding the detrimental effects of atmospheric turbulence. By computer fitting to stored laboratory spectra, we can evaluate the path-averaged concentration of a number of important pollutants such as NO 2 , SO 2 , and 03. A measurement of NH 3 and NO close to the UV limit is also demonstrated.

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Section: Discussionmentioning

confidence: 99%

“…6). Our own work with the DOAS technique started in 1983, and includes the development of a specialized system for atmospheric Hg measurements 7 and spectroscopic investigations for 03 (see Ref. 8) and NH 3 (see Ref.…”

Section: Introductionmentioning

confidence: 99%

Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring

et al. 1993

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“…Since then, it has been used (Platt and Stutz, 2008) for measuring a multitude of atmospheric constituents, e.g. NO 2 , SO 2 (Avino and Manigrasso, 2008), mercury (Edner et al, 1986) and aromatic compounds such as benzene (Barrefors, 1996).…”

Section: Introductionmentioning

confidence: 99%

Replacing the AMOR with the miniDOAS in the ammonia monitoring network in the Netherlands

et al. 2017

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Abstract. In this paper we present the continued development of the miniDOAS, an active differential optical absorption spectroscopy (DOAS) instrument used to measure ammonia concentrations in ambient air. The miniDOAS has been adapted for use in the Dutch National Air Quality Monitoring Network. The miniDOAS replaces the life-expired continuous-flow denuder ammonia monitor (AMOR). From September 2014 to December 2015, both instruments measured in parallel before the change from AMOR to miniDOAS was made. The instruments were deployed at six monitoring stations throughout the Netherlands. We report on the results of this intercomparison.Both instruments show a good uptime of ca. 90 %, adequate for an automatic monitoring network. Although both instruments produce 1 min values of ammonia concentrations, a direct comparison on short timescales such as minutes or hours does not give meaningful results because the AMOR response to changing ammonia concentrations is slow. Comparisons between daily and monthly values show good agreement. For monthly averages, we find a small average offset of 0.65 ± 0.28 µg m −3 and a slope of 1.034 ± 0.028, with the miniDOAS measuring slightly higher than the AMOR. The fast time resolution of the miniDOAS makes the instrument suitable not only for monitoring but also for process studies.

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“…When very precise wavelength control is needed, as is the case with species such as NO and atomic mercury, a piezoscanning device is utilized.' 4 Here a piezocrystal is coupled to the arm. It is controlled by the computer through a high-voltage supply.…”

Section: Optical Systemsmentioning

confidence: 99%

Mobile remote sensing system for atmospheric monitoring

Edner¹,

Fredriksson²,

Sunesson³

et al. 1987

Appl. Opt.

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A mobile optical remote sensing system for environmental monitoring is described. The system, housed in a full-size truck with a laboratory floor surface of 6.0 X 2.3 M 2 , is mainly intended for differential absorption lidar (DIAL) applications but can also be used for laser-induced fluorescence monitoring and for absorption measurements using classical light sources. The system has a 40-cm diam receiving telescope and a fully steerable flat mirror in a transmitting/receiving dome. A Nd:YAG-pumped dye laser with auxiliary nonlinear frequency conversion is the preferred transmitter in DIAL measurements. Measurement examples for atmospheric SO 2 and NO 2 monitoring with automatic concentration map drawings are given and further uses are discussed.

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Differential optical absorption spectroscopy system used for atmospheric mercury monitoring

Cited by 70 publications

References 21 publications

Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring

Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring

Replacing the AMOR with the miniDOAS in the ammonia monitoring network in the Netherlands

Mobile remote sensing system for atmospheric monitoring

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