Authors: Johansson, O.¹; Bood, J.¹; Aldén, M.¹; Lindblad, U.²

Source: Applied Spectroscopy, Volume 62, Issue 1, Pages 4A-27A and 1-131 (January 2008) , pp. 66-72(7)

Publisher: Society for Applied Spectroscopy

Abstract:

Photofragmentation laser-induced fluorescence (PF-LIF) is for the first time demonstrated to be a practical diagnostic tool for detection of hydrogen peroxide. Point measurements as well as two-dimensional (2D) measurements in free-flows, with nitrogen as bath gas, are reported. The present application of the PF-LIF technique involves one laser, emitting radiation of 266 nm wavelength, to dissociate hydrogen peroxide molecules into OH radicals, and another laser, emitting at 282.25 nm, to electronically excite OH, whose laser-induced fluorescence is detected. The measurement procedure is explained in detail and a suitable time separation between photolysis and excitation pulse is proposed to be on the order of a few hundred nanoseconds. With a separation time in that regime, recorded OH excitation scans were found to be thermal and the signal was close to maximum. The PF-LIF signal strength was shown to follow the same trend as the vapor pressure corresponding to the hydrogen peroxide liquid concentration. Thus, the PF-LIF signal appeared to increase linearly with hydrogen peroxide vapor-phase concentration. For 2D single shot measurements, a conservatively estimated value of the detection limit is 30 ppm. Experiments verified that for averaged point measurements the detection limit was well below 30 ppm.

Keywords: HYDROGEN PEROXIDE IMAGING; PHOTOFRAGMENTATION; LASER-INDUCED FLUORESCENCE; LIF

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370208783412618

Affiliations: 1: Division of Combustion Physics, Lund University, Box 118, SE-221 00 Lund, Sweden 2: Tetra Pak Packaging Solutions, Ruben Rausings gata, SE-221 86, Lund, Sweden

Publication date: 2008-01-01

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