Simultaneous measurement of OH radical, H2O concentration, and temperature in a premixed CH4/air flame using TDLAS with an improved analysis method

Sunghyun So, Jiyeon Park, Miyeon Yoo, Jungho Hwang, Daehae Kim, Changyeop Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The OH radical concentration was measured by applying tunable diode laser absorption spectroscopy, which is an in situ optical method. An optical absorption region (P7.5ff transition at 1502.7 nm) of the OH radical was selected in the near-infrared range to measure the OH radicals quantitatively in premixed CH4/air flames. An improved direct absorption spectroscopy (DAS) method based on wavelength division multiplexing was proposed to extract the H2O absorption signal that interfered with the OH light absorption signal, and the integral intensity of OH* chemiluminescence was compared to the measured OH radical concentration based on the improved DAS method.

Original languageEnglish
Pages (from-to)32031-32050
Number of pages20
JournalOptics Express
Volume30
Issue number18
DOIs
Publication statusPublished - 2022 Aug 29

Bibliographical note

Publisher Copyright:
© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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