2-T algorithm for temperature estimation in a non-uniform zone by line-of-site diode laser absorption spectroscopyстатья
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Дата последнего поиска статьи во внешних источниках: 27 февраля 2020 г.
Аннотация:A new two-temperature (2-T) algorithm for an estimation of the temperatures in a non-uniform
hot zone by absorption spectrometry with tunable diode lasers (TDLAS) is demonstrated in
experiments with the Wolfhard–Parker burner. A laminar premixed flame of the burner has
a planar structure with zones of relatively constant temperature and zones with pronounced
temperature gradients. The temperature was evaluated by fitting the experimental absorption
spectra of a H2O molecule by the linear combination of two single temperature spectra
simulated using spectroscopic databases. The radiation of the two diode lasers generating in
7185 cm−1 and 7444 cm−1 spectral ranges crossed the flame in the direction along the slots
at different heights above the burner. Temperature profiles of the flame obtained by fitting the
line-of-sight TDLAS experimental spectra using a 2-T algorithm are compared with the local
temperatures measured by coherent anti-Stokes Raman spectroscopy (CARS). The maximum
and minimum temperatures estimated by the TDLAS and CARS coincide well if the line-ofsight
optical path of the probing diode laser beam consists of a dominantly hot or dominantly
cold layer.