Interference of coherently scattered signals in the laser SRS-CARS monitoring of hydrogen concentration in gas mixtures

Mikheev, G. M.; Kaluzhnyi, D. G.; Popov, A. Yu.; Mogileva, T. N.

doi:10.1134/1.1866439

Cited by 1 publication

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“…The hydrogen concentration is measured via the coherent anti-Stokes Raman scattering (CARS) real-time method [4][5][6][7][8] by using the intensity I a of the anti-Stokes c H 2 scattering component at a frequency ω a . The latter appears in the gas under study as a result of the resonance four-photon interaction of biharmonic laser pumping beams at frequencies ω p and ω s that meet the condition of an approximate resonance ω p -ω s ≈ Ω , where Ω is the frequency of a vibrational transition of molecular hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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A Laser-Based Apparatus for Estimating the Hydrogen Diffusion Constant in Gas Mixtures

2005

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A laser-based apparatus for determining the hydrogen diffusion constant in gas mixtures is described. The main units of the apparatus are a diffusion chamber and a computer-based laser system for the selective diagnostics of hydrogen in gas mixtures by coherent anti-Stokes Raman scattering (CARS) in combination with biharmonic pumping based on stimulated Raman scattering. The diffusion constant is estimated by approximating the experimental data that describe changes in the hydrogen concentration with time at a fixed point in the diffusion chamber and comparing them to the exact solution to the diffusion equation for the chosen one-dimensional experimental geometry.

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Section: Introductionmentioning

confidence: 99%

“…In [8], we experimentally studied nonresonant signal [I a /( I s )] 1/2 of the CARS process as a function of the buffer gas. It was shown that helium and neon possess the lowest nonresonant background level, while the nonresonant backgrounds in ethane and propane are many times higher.…”

Section: Let Us Introduce the Functionmentioning

confidence: 99%