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Spectroscopic properties of a perfluorinated ketone for PLIF applications

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Abstract

This work identifies the fluorescence characteristics of a perfluorinated ketone, 2-trifluoromethyl-1,1,1,2,4,4,5,5,5-nonafluoro-3-pentanone, further referred to as fluoroketone. This compound is suitable for use with the third harmonic of an Nd:YAG laser for quantitative concentration measurements, as it exhibits strong emission even for relatively low excitation and has a near-linear response of fluorescence intensity with concentration. This makes it suitable for a broad range of fluorescence applications. The absorption cross-section of 3.81 × 10−19 cm2 was found to be constant for a temperature range of 293–441 K and a pressure range of 1–18 atm. A calibration line has been generated that relates the concentration of gaseous and liquid fluoroketone with its absorption coefficient.

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Abbreviations

P :

Pressure (atm)

T :

Temperature (K)

P cr :

Critical pressure (atm)

T cr :

Critical temperature (K)

T r :

Reduced temperature

P r :

Reduced pressure

ρ :

Density (kg/m3)

I :

Intensity of the laser sheet (J/m2)

λ :

Wavelength of laser (nm)

σ :

Absorption cross-section (cm2)

σ g :

Absorption cross-section for the ground state (cm2)

σ e :

Absorption cross-section for the excited state (cm2)

N g :

Number of molecules in the ground state

N e :

Number of molecules in the excited state

N :

Total number of molecules

dV :

Collection volume

dl :

Differential length along the laser propagation direction

A :

Area perpendicular to laser propagation direction

N A :

Avogadro’s number

M:

Molecular weight

R :

Universal gas constant

N ph :

Number of incident photons

N fl :

Number of emitted photons due to fluorescence

h :

Planck’s constant

c :

Speed of light (m/s)

φ :

Quantum yield of fluorescence

α:

Absorption coefficient

η optic :

Collection optics efficiency

S :

Fluoroketone vapor fluorescence signal

F, K :

Constants in the fluorescence equation

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Authors and Affiliations

  1. Combustion and Propulsion Laboratory, Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA

    Arnab Roy & Corin Segal

  2. Florida Center for Advanced Aero-Propulsion, 2525 Pottsdamer St, Room A229, Tallahassee, FL, 32310, USA

    Jonas P. R. Gustavsson

Authors
  1. Arnab Roy
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  2. Jonas P. R. Gustavsson
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  3. Corin Segal
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Correspondence to Arnab Roy.

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Roy, A., Gustavsson, J.P.R. & Segal, C. Spectroscopic properties of a perfluorinated ketone for PLIF applications. Exp Fluids 51, 1455–1463 (2011). https://doi.org/10.1007/s00348-011-1163-6

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  • DOI: https://doi.org/10.1007/s00348-011-1163-6

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