WIDECARS multi-parameter measurements in premixed ethylene–air flames using a wavelength stable ultrabroadband dye laser
Abstract
Width-increased dual-pump enhanced coherent anti-Stokes Raman spectroscopy (WIDECARS) measurements were used to determine the temperature and major species mole fractions in laminar, premixed, ethylene–air flames operating at atmospheric pressure. Conventional ultrabroadband dye lasers for WIDECARS, which use Pyrromethene dyes, have historically suffered from day-to-day wavelength shifting. To overcome this problem, a new ultrabroadband dye laser was developed in this study to provide a stable wavelength and power generation. A new dye laser pumping scheme and a mixture of Sulforhodamine 640, Kiton Red 620, and Rhodamine 640, was used to generate the desired FWHM ∼ 15 n m ( 410 c m − 1 ) bandwidth. The WIDECARS measured mole fraction ratios of C O 2 , CO, and H 2 with N 2 agreed well with chemical equilibrium calculations.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 09, 2020
- Source ID
- 10.1364/ao.386378
Entities
People
- Daniel K. Lauriola
- Jordi Estevadeordal
- Naibo Jiang
- Naveed Rahman
- Nicholas Rock
- Paul S. Hsu
- Paul Wrzesinski
- Sean P. Kearney
- Stephen W. Grib
Organizations
- Air Force Research Laboratory
- National Research Council