Raman gas-analyzer for analyzing environmental and technogenic gas media

Buldakov, Mikhail A.; Matrosov, I. I.; Petrov, Dmitri; Tikhomirov, A. A.

doi:10.1134/s1024856012040057

Cited by 20 publications

(17 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…80.1.2 on "Scientifi c principles for designing new gas analysis instruments and procedures for their use for environmental and special monitoring"; the studies to determine the capabilities of our instrument were supported by Contract No. 14 …”

Section: Discussionmentioning

confidence: 97%

“…Experience in working with the SRS spectrometer presented in [14] showed that it is not advisable to use an MDR-12 monochromator as the spectral instrument. This monochromator, besides having a larger footprint and weight, is equipped with a mechanism for rotating the diffraction grating which is not necessary when recording the spectrum with a CCD array.…”

mentioning

confidence: 98%

“…Earlier in [14], we considered two methods for increasing the intensity of spontaneous Raman signals. One method involves using special optical systems ensuring that the laser beam passes multiple times through the scattering volume, and the other method involves increasing the total number of molecules in the gas cuvet by compressing the analyte gaseous medium.…”

mentioning

confidence: 99%

“…We chose these components especially because of their cost and commercial availability. According to (1), optimal illumination of the array was provided for a height of the entrance slit 18 mm and a height of a column in the CCD array of 6 mm. As the dispersive element, we used a refl ective holographic diffraction grating, 1200 lines/mm and size 50 × 50 mm with refl ection coeffi cient ~60% for the working order of diffraction.…”

mentioning

confidence: 99%

See 3 more Smart Citations

High-Sensitivity Spontaneous Raman Spectrometer for Gaseous Media

2015

Self Cite

View full text Add to dashboard Cite

We have developed a spectrometer designed to record spontaneous Raman scattering (SRS) spectra in gaseous media. The spectrometer has improved sensitivity due to using a high-performance spectral instrument and also a device for compressing the analyte gaseous medium. We present the results of an experimental test of the spectrometer, and show that its limiting sensitivity for methane is <1 ppm.Introduction. Diagnostics of the composition of gaseous media at a new technical level are greatly needed in today's society. Environmental protection agencies and agencies of the Ministry for Civil Defense, Emergencies, and Disaster Response especially need high-sensitivity monitoring instruments solving problems for both environmental monitoring of atmospheric pollution and identifying emergency situations associated with emission of toxic gases into the atmosphere [1]. In connection with development of the corresponding instrumentation, refi ning analysis methods, and improving metrological characteristics of gas analyzers, the list of their fi elds of application is steadily expanding. Today they are acutely needed to solve such problems as diagnosis of diseases from the composition of exhaled air [2][3][4][5], detection of explosives [6-8] and narcotics [9], optimization of combustion processes in heating and power plants [10], high-precision monitoring of the composition of fuel gases [11][12][13], etc.Despite the broad range of physical principles for monitoring gaseous media and instruments based on them, optical diagnostics methods are especially important. This is because of their high sensitivity, selectivity, and speed at which results are obtained. The most attractive optical diagnostics method is spontaneous Raman scattering (SRS) spectroscopy. The SRS method for gas analysis makes it possible to simultaneously record any molecular components of the gaseous medium using a single laser with fi xed wavelength, where the SRS signal for each gaseous component is strictly individual, proportional to its concentration, practically instantaneous, and does not depend on the composition of the gaseous medium. Owing to such a unique set of properties, the SRS method is a general-purpose optical method for analysis of multicomponent molecular gaseous media, including media whose composition is not known ahead of time. The major disadvantage of this method is the low intensity of the SRS signals in a gaseous medium, due to the low density of molecules and the small light scattering cross section (~10 -30 cm 2 /sr). However, when using high-sensitivity multichannel photodetectors, and also with improved effi ciency of detection of the SRS signals, the possibility arose to design a high-sensitivity SRS spectrometer and an SRS gas analyzer.Design of the Spontaneous Raman Spectrometer. An SRS spectrometer for gaseous media was modifi ed in the Environmental Instrumentation Laboratory of the Institute for Monitoring Climatic and Ecological Systems (Siberian Branch, Russian Academy of Sciences). The block diagram for this inst...

show abstract

Section: Discussionmentioning

confidence: 97%

mentioning

confidence: 98%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

High-Sensitivity Spontaneous Raman Spectrometer for Gaseous Media

2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…The CO 2 +S O 2 gas spectrum agrees very well with the literature. 5,18 If CO 2 is present in the solid state, the Fermi dyad peaks shift to lower frequencies at 1276.3 and 1384.7 cm −1 .W h e nS O 2 is enclathrated, the peak at 1151.5 cm −1 shifts to a lower frequency at 1147.1 cm −1 . For enclathrated CO 2 the higherfrequency peak of the Fermi dyad blue shifts to 1380.8 cm −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Dissociation Conditions and Raman Spectra of CO₂ + SO₂ and CO₂ + H₂S Hydrates

Chen

Ripmeester

2015

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

/npsi/ctrl?action=rtdoc&an=21275784&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21275784&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

show abstract

Permutationally invariant polynomial representation of polarizability tensor surfaces for linear regression analysis

Omodemi

Kaledin

2022

J Comput Chem

View full text Add to dashboard Cite

A linearly parameterized functional form for a Cartesian representation of molecular dipole polarizability tensor surfaces (PTS) is described. The proposed expression for the PTS is a linearization of the recently reported power series ansatz of the original Applequist model, which by construction is non-linear in parameter space. This new approach possesses (i) a unique solution to the least-squares fitting problem; (ii) a low level of the computational complexity of the resulting linear regression procedure, comparable to those of the potential energy and dipole moment surfaces; and (iii) a competitive level of accuracy compared to the non-linear PTS model. Calculations of CH 4 PTS, with polarizabilities fitted to 9000 training set points with the energies up to 14,000 cm À1 show an impressive level of accuracy of the linear PTS model

show abstract

Raman gas-analyzer for analyzing environmental and technogenic gas media

Cited by 20 publications

References 15 publications

High-Sensitivity Spontaneous Raman Spectrometer for Gaseous Media

High-Sensitivity Spontaneous Raman Spectrometer for Gaseous Media

Dissociation Conditions and Raman Spectra of CO₂ + SO₂ and CO₂ + H₂S Hydrates

Permutationally invariant polynomial representation of polarizability tensor surfaces for linear regression analysis

Contact Info

Product

Resources

About

Raman gas-analyzer for analyzing environmental and technogenic gas media

Cited by 20 publications

References 15 publications

High-Sensitivity Spontaneous Raman Spectrometer for Gaseous Media

High-Sensitivity Spontaneous Raman Spectrometer for Gaseous Media

Dissociation Conditions and Raman Spectra of CO2 + SO2 and CO2 + H2S Hydrates

Permutationally invariant polynomial representation of polarizability tensor surfaces for linear regression analysis

Contact Info

Product

Resources

About

Dissociation Conditions and Raman Spectra of CO₂ + SO₂ and CO₂ + H₂S Hydrates