Single-shot imaging of OH radicals and simultaneous OH radical/acetone imaging with a tunable Nd : YAG laser

Sick, Volker; Wermuth, Nicole

doi:10.1007/s00340-004-1545-z

Cited by 13 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fundamental data of OH molecular transitions are communicated in selected references [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. Interrogations of ground-state or ground-level populations employ laser-induced fluorescence [50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68] with practical applications to combustion diagnosis [69][70][71][72][73][74]. However, diagnosis applications are based on extensive studies of the ultraviolet OH system [75][76][77][78][79]…”

Section: Mini-summary Of Oh Literature and Applicationsmentioning

confidence: 99%

Laser-Plasma Spectroscopy of Hydroxyl with Applications

et al. 2020

View full text Add to dashboard Cite

This article discusses laser-induced laboratory-air plasma measurements and analysis of hydroxyl (OH) ultraviolet spectra. The computations of the OH spectra utilize line strength data that were developed previously and that are now communicated for the first time. The line strengths have been utilized extensively in interpretation of recorded molecular emission spectra and have been well-tested in laser-induced fluorescence applications for the purpose of temperature inferences from recorded data. Moreover, new experiments with Q-switched laser pulses illustrate occurrence of molecular recombination spectra for time delays of the order of several dozen of microseconds after plasma initiation. The OH signals occur due to the natural humidity in laboratory air. Centrifugal stretching of the Franck-Condon factors and r-centroids are included in the process of determining the line strengths that are communicated as a Supplementary File. Laser spectroscopy applications of detailed OH computations include laser-induced plasma and combustion analyses, to name but two applications. This work also includes literature references that address various diagnosis applications.

show abstract

Section: Mini-summary Of Oh Literature and Applicationsmentioning

confidence: 99%

Laser-Plasma Spectroscopy of Hydroxyl with Applications

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, the spatial distribution of this signal does not show a peak in the reaction zone, but rather a profile reflecting the distribution of natural OH in the flame. Given the relatively broad linewidth of the picosecond laser pulse (∼ 5 cm -1 , FWHM), it is possible to excite OH using weak vibronic transitions in the vicinity of 266.0 nm [46], which thus may be the origin of the observed weak OH fluorescence.…”

Section: Discussion Of Differences In Ho 2 Photolysis With Picosecondmentioning

confidence: 99%

Investigation of photochemical effects in flame diagnostics with picosecond photofragmentation laser-induced fluorescence

Jönsson

Larsson

Borggren

et al. 2016

Combustion and Flame

View full text Add to dashboard Cite

“…In this way, this scheme has an inherent capability to examine ultra-lean (φ < 0.6) flames. Although there have been several studies that applied acetone-OH simultaneous PLIF to combustion studies (e.g., Seitzman et al, 1994, Yip et al, 1994, Tamura et al, 1998, and Sick & Wermuth, 2004; note that most past works applied to non-premixed flames), Nakamura et al, was the first to apply this concept to look for the local flame structure in laminar/turbulent premixed flames and successfully achieved clear imaging of local flamelet thickness and curvature (Nakamura et al 2005). For demonstrative purpose, local extinction occurring under an ultra-lean mixture condition (φ < 0.6) in a weakly-disturbed flow field has successfully captured by this scheme (Nakamura et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Strategy to diagnose ultra-lean (ϕ < 0.6) premixed flames by acetone-OH simultaneous PLIF with one-laser and one-detector combination

Nakamura

Yamada

Hirota

et al. 2010

J Vis

View full text Add to dashboard Cite

A strategy to diagnose ultra-lean flames utilizing the "acetone-OH simultaneous PLIF" concept via a one-laser and one-detector combination system is presented. The main of the present work is to overcome difficulties encountered in our previous studies; namely, that the seeding amount of acetone used for visualization purposes must be sufficiently small in order to avoid its effect on flame structure (at least < 5 % of fuel), while clear imaging also must be accomplished under such conditions. For this purpose, several important revisions have been made; 1) the 266 nm excitation line has been added to improve the fluorescence from acetone, 2) a dual-peak band-pass filter has been introduced instead of conventional blue filter and 3) controllability of fine acetone seeding has been improved. The effects of these changes on flame imaging are also investigated. Clear visualization of the flame zone of a very lean premixed flame, of which the limiting equivalence ratio is below 0.6, has been successfully achieved for the first time with one-laser and one-detector system. The time-dependent, near-extinction flame 2 behavior is also clearly imaged, suggesting that this method could utilize to investigate the flame extinction study.

show abstract

Single-shot imaging of OH radicals and simultaneous OH radical/acetone imaging with a tunable Nd : YAG laser

Cited by 13 publications

References 20 publications

Laser-Plasma Spectroscopy of Hydroxyl with Applications

Laser-Plasma Spectroscopy of Hydroxyl with Applications

Investigation of photochemical effects in flame diagnostics with picosecond photofragmentation laser-induced fluorescence

Strategy to diagnose ultra-lean (ϕ < 0.6) premixed flames by acetone-OH simultaneous PLIF with one-laser and one-detector combination

Contact Info

Product

Resources

About