An optical system for measuring nitric oxide using spectral separation techniques

Zhang, Y. G.; Somesfalean, Gabriel; Guo, Wenfeng; Wang, H. S.; Wu, Shaohua; Qin, Yifan; Zhang, Z. G.

doi:10.1007/s00340-012-4965-1

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…The absorption cross section of NO 2 is significantly lower than that of SO 2 , and the concentration of NO 2 is typically low, making its interference with the spectrum negligible. NO with high concentration exhibits a narrow absorption band and is relatively easy to remove. , High concentration of NH 3 and H 2 S, along with the interfering SO 2 , is easily absorbed by water because of their acid–base properties and solubility. After passing through water filtration, using CaCl 2 particles can remove the influence of water vapor without affecting sulfides.…”

Section: Resultsmentioning

confidence: 99%

“…NO with high concentration exhibits a narrow absorption band and is relatively easy to remove. 49,50 High concentration of NH 3 and H 2 S, along with the interfering SO 2 , is easily absorbed by water because of their acid−base properties and solubility. After passing through water filtration, using CaCl 2 particles can remove the influence of water vapor without affecting sulfides.…”

Section: Stability and Detection Limitmentioning

confidence: 99%

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Sensitive Detection of OCS Using Thermal Conversion Combined with Spectral Reconstruction Filtering Differential Optical Absorption Spectroscopy

Wu,

Gao,

et al. 2024

Anal. Chem.

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Carbonyl sulfide (OCS) is a toxic gas produced during industrial processes that poses risks to both human health and industrial equipment. Therefore, detecting OCS concentrations plays a crucial role in early hazard warning. This paper presents an online system for detecting OCS at the ppb level using thermal conversion and spectral reconstruction filtering differential optical absorption spectroscopy (SRF-DOAS). First, OCS, which is not suitable for DOAS due to its weak absorption characteristics, is completely transformed into SO 2 with strong absorption characteristics under high-temperature conditions. Then, the spectral reconstruction filtering method (SRF) is proposed to eliminate the noise and interference. The core idea of the method is to arrange the spectrum according to the spectral intensity from small to large rather than wavelength, reconstructing the spectrum into a new spectrum with linear characteristics. The reconstructed spectrum can remove noise and interference by linear fitting and retain the characteristic of SO 2 oscillation absorption. Next, we demonstrate the ability of the reconstructed spectral method to remove noise and interference by comparing the spectra of the inverse-reconstructed gas mixture and SO 2 . The relative deviation of 0.88% at 100 ppb and detection limit of 7.26 ppb*m for OCS were obtained using the SRF-DOAS method. Finally, the reliability of the system was confirmed by measurements of OCS concentrations in mixture gas of OCS and air, as well as in human exhaled breath.

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Section: Resultsmentioning

confidence: 99%

Section: Stability and Detection Limitmentioning

confidence: 99%

Sensitive Detection of OCS Using Thermal Conversion Combined with Spectral Reconstruction Filtering Differential Optical Absorption Spectroscopy

Wu,

Gao,

et al. 2024

Anal. Chem.

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Measuring NO and temperature in plasma preheated air using UV absorption spectroscopy

2020

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A new fast sensor for simultaneous high temperature diagnostics (above 800 K) of nitrogen oxide (NO) concentration and gas temperature (T) was developed based on the spectral fitting of low-resolution NO UV absorption near 226 nm. The sensor was intended for process control in future low-carbon footprint heavy process industries using renewable powered electro fuels (e.g. H2, NH3) or plasma torches as heat source. Due to excitation of molecular vibration, the shape of the selected NO feature, including (0, 0), (1, 1), and (2, 2) vibrational transitions of the A2Σ+ − X2Π2 electronic system had a strong temperature sensitivity at temperatures above 800 K. The fitting was made using the well-known NO molecular constants of the A2Σ+ − X2Π2 electronic system. To reduce the computational time, a library of the molecular spectra calculated at different temperatures was created. The fitting of an experimental spectrum representing the convolution of the instrument line function of the spectrometer with the molecular spectra was performed using the pre-calculated library spectra. Based on comparison with conventional measurement methods, the accuracy of the developed sensor was within 15% for NO and about 40 K for T, clearly showing the potential for fast in situ diagnostics in hot process gases.

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An ultra-sensitive detection system for sulfur dioxide and nitric oxide based on improved differential optical absorption spectroscopy method

Peng

Zhou

Liu

et al. 2020

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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An optical system for measuring nitric oxide using spectral separation techniques

Cited by 9 publications

References 22 publications

Sensitive Detection of OCS Using Thermal Conversion Combined with Spectral Reconstruction Filtering Differential Optical Absorption Spectroscopy

Sensitive Detection of OCS Using Thermal Conversion Combined with Spectral Reconstruction Filtering Differential Optical Absorption Spectroscopy

Measuring NO and temperature in plasma preheated air using UV absorption spectroscopy

An ultra-sensitive detection system for sulfur dioxide and nitric oxide based on improved differential optical absorption spectroscopy method

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