Intracavity Laser Absorption Spectroscopy (ICLAS) was used to measure concentration profiles of NH2 in low pressure (30 Torr) methane/oxygen/nitrogen flames doped with small amounts of N2O, NO, NH3. The effective optical length of ICLAS, which dictates the sensitivity of the method, was controlled by the generation time of the quasi cw-laser. The effective optical length of 0.87 km, reached at generation time of 75 μsec, provided very high sensitivity: from 5 × 1010 molec/cc at 500 K in the vicinity of burner ≤ 2 × 1011 molec/cc in the burnt gas zone. The radial profile of NH2, measured using a tomographic technique, indicated that the radical is located mainly inside a cylinder with diameter equal to the burner diameter. In the ammonia doped flame the calculations predicted an additional concentration maximum located close to the burner. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
|Number of pages||1|
|State||Published - 2004|
|Event||30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States|
Duration: 25 Jul 2004 → 30 Jul 2004
|Conference||30th International Symposium on Combustion, Abstracts of Symposium Papers|
|Period||25/07/04 → 30/07/04|
Bibliographical noteFunding Information:
This research was supported by the Israel Science Foundation (Grant No. 574/00) and by the James Franck, German-Israeli Binational Program in Laser Matter Interaction.