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124 results on '"Hernberg, R."'

3. Instrumentation for measuring fluorescence cross sections from airborne microsized particles

Author

Manninen, A., Putkiranta, M., Rostedt, A., Saarela, J., Laurila, T., Marjamaki, M., Keskinen, J., and Hernberg, R.

Subjects
Fluorescence -- Measurement, Particles -- Optical properties, Wavelength -- Influence, Astronomy, Physics
Abstract

An experimental instrument for measuring a laser-induced fluorescence spectrum from a single aerosol particle is described. As a demonstration of instrument capabilities, the results of monodisperse 4.7 [miro]m sodium chloride particles doped with fluorescent riboflavin, produced with an inkjet aerosol generator, are presented. The fluorescence of the aerosol particles is excited in the wide range from 210 to 419 nm using a pulsed, tunable optical parametric oscillator laser. The maximum of the fluorescence emission of separately measured particles is detected at 560 nm. The dependence of the fluorescence on the excitation wavelength is studied and fluorescence cross sections are estimated. Agreement between the measured fluorescence data and the literature data for riboflavin is observed. OCIS codes: 170.6280, 300.2530.

Published
2008

13. Characterization of Burning Char Particles under Pressurized Conditions by Simultaneous in Situ Measurement of Surface Temperature and Size

Author

Reichelt, T., Joutsenoja, T., Spliethoff, H., Hein, K. R. G., and Hernberg, R.

Subjects
otorhinolaryngologic diseases, technology, industry, and agriculture, respiratory system, complex mixtures, respiratory tract diseases, ddc
Abstract

Surface temperature and size of individual burning char particles were measured at elevated temperature and pressure using a two-color pyrometric technique. Experimental results obtained in a pilot-scale pressurized entrained flow reactor are presented. The studies concern two German coals: the Gottelborn high volatile bituminous (hvb) coal and Rhenish brown coal from the opencast mine Garzweiler. The obtained results show considerably different particle behavior due to different coal properties. In the case of the Gottelborn hard coal, typical excess temperatures at oxygen concentration of 12 vol

Published
1997

32. Experimental Determination of SO2, C2H2, and O2UV Absorption Cross Sections at Elevated Temperatures and Pressures

Author

Vattulainen, J., Wallenius, L., Stenberg, J., Hernberg, R., and Linna, V.

Abstract

A heated and pressurized quartz cell with 150.5-mm pathlength was used to experimentally determine UV absorption spectra and further absorption cross sections of SO2, C2H2, and O2in the wavelength range between 200 and 400 nm. Spectra were recorded at room temperature, and at 600 and 800 °C and at absolute pressures between 1 and 6 bar. A 30-W deuterium lamp was used as a light source, and the light was detected with a photomultiplier tube through a 0.4-m Czerny–Turner monochromator. Slit widths of the monochromator were adjusted to achieve a 5 Å measurement bandwidth, and the scan through the wavelength range was made in 5 Å steps. For each individual temperature and pressure level, a reference spectrum was first recorded with the cell filled with nitrogen. After this, the cell was filled with the selected species mixed with nitrogen, and the absorption spectra were recorded in similar conditions. The studied gas mixtures were calibrated to 3% accuracy.

Published
1997
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