Quantitative two-photon laser-induced fluorescence of hydrogen atoms in a 1 kW arcjet thruster

1998 ◽  
Vol 67 (2) ◽  
pp. 193-205 ◽  
Author(s):  
I.J. Wysong ◽  
J.A. Pobst
Keyword(s):  
Laser Induced Fluorescence ◽  
Hydrogen Atoms ◽  
Two Photon

Effect of Laser-Induced Dissociation during Measurements of Hydrogen Atoms in Silane Plasmas Using Two-Photon-Excited Laser-Induced Fluorescence

1992 ◽  
Vol 31 (Part 1, No. 9A) ◽  
pp. 2917-2918 ◽  
Author(s):  
Won Zoo Park ◽  
Manabu Tanigawa ◽  
Toshinori Kajiwara ◽  
Katsunori Muraoka ◽  
Mitsuharu Masuda ◽  
...  
Keyword(s):  
Laser Induced Fluorescence ◽  
Hydrogen Atoms ◽  
Two Photon

Two-Dimensional Imaging of Flame Species Using Two-Photon Laser-Induced Fluorescence

1997 ◽  
Vol 51 (8) ◽  
pp. 1229-1237 ◽  
Author(s):  
Nikola Georgiev ◽  
Marcus Aldén
Keyword(s):  
Carbon Monoxide ◽  
Equivalence Ratio ◽  
Potential Problem ◽  
Laser Intensity ◽  
Laser Induced Fluorescence ◽  
Two Dimensional ◽  
Hydrogen Atoms ◽  
Intensity Dependence ◽  
Two Photon ◽  
2D Imaging

The potential for two-dimensional visualization of combustion species by using two-photon laser-induced fluorescence (LIF) has been investigated. The technique was applied for two-dimensional (2D) imaging of carbon monoxide, ammonia, oxygen, and hydrogen atoms in flames. Approaches for compensating the signal intensity for the quadratic laser intensity dependence in two-photon imaging are discussed. For the case of CO and H atom visualization, a potential problem is the interference from nonresonantly excited C2, whose emission spectrally and spatially coincides with the fluorescence from CO. Different strategies for elimination of the C2 emission were investigated. It was found out that the emissions from CO and C2 can be separated in time. For the case of the oxygen atoms, it was observed that the relation between the intensities of the fluorescence signals at 845 and 777 nm changes with the equivalence ratio of the investigated flame. An attempt to estimate the 2D detection limit for these species in flames is also made.

Imaging hydrogen flames by two-photon, laser-induced fluorescence

1991 ◽  
Author(s):  
R. MILES ◽  
W. LEMPERT ◽  
V. KUMAR ◽  
G. DISKIN
Keyword(s):  
Laser Induced Fluorescence ◽  
Two Photon

scholarly journals Progresses on the Use of Two-Photon Absorption Laser Induced Fluorescence (TALIF) Diagnostics for Measuring Absolute Atomic Densities in Plasmas and Flames

Plasma ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 145-171
Author(s):  
Kristaq Gazeli ◽  
Guillaume Lombardi ◽  
Xavier Aubert ◽  
Corinne Y. Duluard ◽  
Swaminathan Prasanna ◽  
...  
Keyword(s):  
Optical Transition ◽  
Thin Film Deposition ◽  
Laser Induced Fluorescence ◽  
Film Deposition ◽  
Stimulated Emission ◽  
Photon Absorption ◽  
Collisional Quenching ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Wide Range

Recent developments in plasma science and technology have opened new areas of research both for fundamental purposes (e.g., description of key physical phenomena involved in laboratory plasmas) and novel applications (material synthesis, microelectronics, thin film deposition, biomedicine, environment, flow control, to name a few). With the increasing availability of advanced optical diagnostics (fast framing imaging, gas flow visualization, emission/absorption spectroscopy, etc.), a better understanding of the physicochemical processes taking place in different electrical discharges has been achieved. In this direction, the implementation of fast (ns) and ultrafast (ps and fs) lasers has been essential for the precise determination of the electron density and temperature, the axial and radial gradients of electric fields, the gas temperature, and the absolute density of ground-state reactive atoms and molecules in non-equilibrium plasmas. For those species, the use of laser-based spectroscopy has led to their in situ quantification with high temporal and spatial resolution, with excellent sensitivity. The present review is dedicated to the advances of two-photon absorption laser induced fluorescence (TALIF) techniques for the measurement of reactive species densities (particularly atoms such as N, H and O) in a wide range of pressures in plasmas and flames. The requirements for the appropriate implementation of TALIF techniques as well as their fundamental principles are presented based on representative published works. The limitations on the density determination imposed by different factors are also discussed. These may refer to the increasing pressure of the probed medium (leading to a significant collisional quenching of excited states), and other issues originating in the high instantaneous power density of the lasers used (such as photodissociation, amplified stimulated emission, and photoionization, resulting to the saturation of the optical transition of interest).

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