Historical perspective of COIL diagnostics

Davis, Steven J.

doi:10.1117/12.465793

Cited by 8 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(a) system, and mapped the functional characteristics of the 1, dissociation process, did so through elegant application of a limited set of diagnostic tools. Since that time advanced techniques for characterizing the key species in COIL systems have been developed, as described in the paper by Davis 35 . Application of the full range of diagnostic techniques in new studies of the dissociation mechanism will lead to a final resolution of this long-standing problem.…”

Section: Resultsmentioning

confidence: 99%

Mechanism and kinetics of iodine dissociation in COIL

Komissarov

Goncharov

2002

Gas and Chemical Lasers and Intense Beam Applications III

View full text Add to dashboard Cite

Dissociation of 12 by 0 2 (a'A), with subsequent excitation of I*, was first observed by Arnold et al.' in 1966. This key discovery led to the eventual development of the chemical oxygen iodine laser (COIL). The mechanism by which 12 is dissociated was not determined by Arnold et al. ' and has remained elusive, despite many experimental attempts to unravel this question. Although the details are not known, it is apparent that a complex interplay between vibrationally and electronically excited states of 1L is involved. Vibrationally excited states of 02 have also been implicated. Characterization of the dissociation process is an important issue for COIL as the efficiency is impacted by the energy cost of dissociating the iodine. In this paper we provide a historical summary of work on the dissociation mechanism, and summarize the current understanding of the problem.

show abstract

Section: Resultsmentioning

confidence: 99%

Mechanism and kinetics of iodine dissociation in COIL

Komissarov

Goncharov

2002

Gas and Chemical Lasers and Intense Beam Applications III

View full text Add to dashboard Cite

show abstract

“…Thus various parameters viz. specie concentration [11][12][13] of the lasing, pumping mediums and other by-products, medium homogeneity [14], individual constituent gas flow rate, pressure and temperature at critical locations and cavity Mach number are very crucial in determining the output of the gas laser system. It is essential to determine these parameters nonintrusively, with necessary precision to be able to optimize these lasers especially in case of large-scale systems.…”

Section: Introductionmentioning

confidence: 99%

Overview of Optical Techniques for Characterization of High-Power Infrared Gas Lasers

et al. 2015

View full text Add to dashboard Cite

High power lasers typically form a multidisciplinary technological area laced with innumerable challenges in its realization as a practical system. The prime amongst them are infrared gas laser sources such as Carbon-di-Oxide Gas Dynamic Laser, Hydrogen Fluoride, Deuterium Fluoride Laser and Chemical Oxygen Iodine Laser etc. Each of these laser systems is associated with a unique as well as complex active medium environment involving intense interaction between lasing and pumping species under specific gas dynamic conditions. The parameters viz. specie concentration of the lasing, pumping mediums and other by-products, medium homogeneity, individual constituent gas flow rate, pressure and temperature at critical locations and cavity Mach number are very crucial in determining the output of the gas laser system. It is essential to determine these parameters non-intrusively, with necessary precision so as to optimize these lasers especially in case of largescale systems. Thus, the focus of this paper is to review and discuss the existing applicable optical detection methodologies ranging from the more established methods such as optical absorption/emission spectroscopy to very contemporary like Raman spectroscopy, cavity ring down spectroscopy, laser induced fluorescence/ planer laser induced fluorescence etc., which are relevant for the diagnostic needs of gas lasers.

show abstract

How many O2(Δ1) molecules are consumed per dissociated I2 in chemical oxygen-iodine lasers?

Rybalkin

Katz

Waichman

et al. 2006

Applied Physics Letters

View full text Add to dashboard Cite

Direct measurements of the dissociation of I2 molecules at the optical axis of a supersonic chemical oxygen-iodine laser (COIL) as a function of I2 flow rate were carried out. This enabled us to determine the number of consumed O2(Δ1) molecules per dissociated I2 molecule. The number depends on the experimental conditions: it is 4.2±0.4 for typical conditions and I2 densities applied for the operation of the COIL, but increases at lower I2 densities. Possible dissociation mechanisms consistent with our results are discussed and the importance of dissociating I2 prior to its mixing with O2(Δ1) is stressed.

show abstract

Historical perspective of COIL diagnostics

Cited by 8 publications

References 25 publications

Mechanism and kinetics of iodine dissociation in COIL

Mechanism and kinetics of iodine dissociation in COIL

Overview of Optical Techniques for Characterization of High-Power Infrared Gas Lasers

How many O2(Δ1) molecules are consumed per dissociated I2 in chemical oxygen-iodine lasers?

Contact Info

Product

Resources

About