Measurements on the Raman Component of Laser Atmospheric Backscatter

Cooney, John

doi:10.1063/1.1651884

Cited by 99 publications

(24 citation statements)

References 3 publications

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“…Leonard has detected, as the pioneer work, the Raman scattering signal from atmospheric 02 and N2 molecules by using a pulsed N2 gas laser oscillating at 3371 A [30]. Cooney has measured the Raman intensity from N2 molecule as a function of the range employing a Q-switched ruby laser at 6943 A [31]. We have also performed the spectral analysis of the Raman echoes of N2 and O5 molecules in the air path passing the ruby laser beam [1,17,29].…”

Section: Automobile Exhaust Gasmentioning

confidence: 99%

Laser-Raman radar ?Laser-Raman scattering methods for remote detection and analysis of atmospheric pollution

Inaba

Kobayasi

1972

Opto-electronics

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This paper reviews the recent progress of the laser radar method, providing single-ended and range-resolved means for remote detection and analysis of various molecular species in the polluted as well as ordinary atmosphere, based on the existence of their Raman backscattering; simply called the laser-Raman radar method. A brief description is given of the operational principle including the basic concept and fundamental characteristics of this scheme, along with critical discussions of their advantages. The differential backscattering cross section and the spectral distribution of Raman scattering of molecular species present in the atmosphere are discussed and summarized from the practical view-point for providing molecular density evaluation and interference-free detection. After presenting experimental approaches of the laser-Raman scheme to show the feasibility of in-field monitoring and analysis of chemical species in various air conditions, the estimation of molecular concentrations is performed from observed Raman spectra. Analytical discussions on the minimum detectable concentration and the range detectivity are also presented to indicate the present capability and limitation of this laser-Raman technique. The potentiality for further progress in resonance Raman scattering for range-resolved measurement of dispersed pollutants in ambient air is pointed out.

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Section: Automobile Exhaust Gasmentioning

confidence: 99%

Laser-Raman radar ?Laser-Raman scattering methods for remote detection and analysis of atmospheric pollution

Inaba

Kobayasi

1972

Opto-electronics

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“…The Remote laser Raman scattering measurement was first performed to detect dominant air molecules such as nitrogen by Leonard (1967) and Cooney (1968) and water vapor by Melfi et al (1969) using doubled ruby lasers. The Raman technique has been extended to demonstrate spectroscopic detection of air pollutants such as SO 2> CO 2 , C 2 H 4 , NO, CO, H 2 S, CH 4 in automobile exhaust gases (Kobayashi and Inaba, 1971;Inaba and Kobayashi, 1972), SO 2 and kerosene (Hirschf eld et al, 1973), and SO 2 and N 2 (Nakahara et al, 1972).…”

Section: Measurements Of Atmospheric Molecules and Air Pollutantsmentioning

confidence: 99%

Techniques for laser remote sensing of the environment

Kobayashi¹

1987

Remote Sensing Reviews

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“…In spite of the difficulty inherent in the small scattering cross section, laser Raman radar is being extensively investigated as a tool for remote sensing of molecular constituents in the atmosphere, because of its unique information on the constituents without ambiguity of Mie or Rayleigh scattering and the ability of simultaneous remote measurement of multiple molecular constituents with one light source of an arbitrary wavelength [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Detection of sulphur dioxide in stack plume by laser Raman radar

et al. 1972

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Laser Raman radar offers a promising approach to the remote sensing of atmospheric pollutants in stack plume. An analysis revealed that the combination of the second harmonic of a Nd :YAG laser, a synchronous single photoelectron counting (SSPC) scheme, and narrow passband interference filter employed for light source, signal processor, and separation of Raman-scattered light respectively gave the most sensitive system for stack effluent monitoring. Using a laser Raman radar constructed on the basis of the analysis, the concentration of SO~ in the plume emitted from a 150 m high stack of a power plant was measured at a distance of 228 m.

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Measurements on the Raman Component of Laser Atmospheric Backscatter

Cited by 99 publications

References 3 publications

Laser-Raman radar ?Laser-Raman scattering methods for remote detection and analysis of atmospheric pollution

Laser-Raman radar ?Laser-Raman scattering methods for remote detection and analysis of atmospheric pollution

Techniques for laser remote sensing of the environment

Detection of sulphur dioxide in stack plume by laser Raman radar

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