Potential of two-line atomic fluorescence for temperature imaging in turbulent indium-oxide-producing flames
The applicability of two-line atomic fluorescence (TLAF) for temperature imaging in an indium-based flame spray pyrolysis (FSP) process is demonstrated using a single tunable optical parametric oscillator (OPO) to generate the required excitation wavelengths consecutively. Single-shot images of the detected fluorescence signals demonstrate that the signal levels in the flame are suitable for evaluation of temperature and verify the capability and potential of the measurement technique directly during particle formation without additional indium seeding. Qualitative averaged two-dimensional temperature distributions in the FSP flame are presented, showing the influence of varying sheath gas flow rates on the resulting temperature distribution. With the addition of a second OPO and detection system, the two fluorescence signals acquired consecutively in this work could be obtained simultaneously and enable spatio-temporally resolved single-shot temperature measurements in flame synthesis processes of indium-containing nanoparticles.
KeywordsFlame spray pyrolysis Indium(III)-oxide nanoparticles Two-line atomic fluorescence Temperature measurement
- Engel SR, Koegler AF, Gao Y, Kilian D, Voigt M, Seeger T, Peukert W, Leipertz A (2012) Gas phase temperature measurements in the liquid and particle regime of a flame spray pyrolysis process using O2-based pure rotational coherent anti-Stokes Raman scattering. Appl Opt 51:6063–6075CrossRefGoogle Scholar
- Solomon PR, Best PE (1991) Fourier transform infrared emission/transmission spectroscopy in flames. In: Chigier N (ed) Combustion measurements, vol 1. Hemisphere Publishing Corporation, New York, pp 385–444Google Scholar
- Stricker WP (2002) Measurement of temperature in laboratory flames and particle devices. In: Kohse-Höinghaus K, Jeffries JB (eds) Combustion applied diagnostics. Taylor and Francis, New York, pp 155–193Google Scholar