Haslam, JK
1996
The Use of Two Pyromethane Dyes in a Single Strokes Dye Laser to Make CARS Temperature and Multiple Species (CO, CO2, O2, N2) Concentration Measurements
Haslam, J.K. and Hedman, P.O.
Proceedings at the Fall Meeting of the Western States Section/Combustion Institute, The University of Southern California, Los Angeles, California, October 28-29, 1996. Funded by ACERC and Morgantown Energy Technology Center (ATS).
New laser dyes allow improvement in existing coherent ant-Strokes Raman spectroscopy (CARS) instruments. In the past, single Strokes, beam CARS instruments have been used to probe one species for temperature and concentration (e.g. N2). In order to probe multiple species simultaneously (CO, CO2, O2, N2), two Strokes beams are often used in what is known as a dual-Strokes CARS instrument. However. The dual-Strokes beam instruments are relatively inefficient, difficult to align and optics intensive. With new Pyromethene dyes, a single Strokes beam can be used to probe the same species as the dual Strokes with enhanced performance. In this experiment, two new CARS system dyes were compared and evaluated for enhanced multi-species detection. The improved CARS instrument uses a mixture of Pyromethene 597 and Pyromethene 650 for a single Strokes laser beam. These two mixed dyes have sufficient spectral band width and improved intensity to replace the traditional Rhodamine 575/601 dye and Rhodamine 640 dyes of an earlier dual-Strokes CARS instrument. The improved Pyromethene single Strokes CARS system has been used to obtain CARS spectra (CO, CO2, O2, N2) that allowed CARS temperature and species concentration measurements in a swirling, turbulent, premixed natural gas/air burner to be obtained.
Haslam, JK
1996
The Use of Two Pyromethane Dyes in a Single Strokes Dye Laser to Make CARS Temperature and Multiple Species (CO, CO2, O2, N2) Concentration Measurements
Haslam, J.K. and Hedman, P.O.
Proceedings at the Fall Meeting of the Western States Section/Combustion Institute, The University of Southern California, Los Angeles, California, October 28-29, 1996. Funded by ACERC and Morgantown Energy Technology Center (ATS).
New laser dyes allow improvement in existing coherent ant-Strokes Raman spectroscopy (CARS) instruments. In the past, single Strokes, beam CARS instruments have been used to probe one species for temperature and concentration (e.g. N2). In order to probe multiple species simultaneously (CO, CO2, O2, N2), two Strokes beams are often used in what is known as a dual-Strokes CARS instrument. However. The dual-Strokes beam instruments are relatively inefficient, difficult to align and optics intensive. With new Pyromethene dyes, a single Strokes beam can be used to probe the same species as the dual Strokes with enhanced performance. In this experiment, two new CARS system dyes were compared and evaluated for enhanced multi-species detection. The improved CARS instrument uses a mixture of Pyromethene 597 and Pyromethene 650 for a single Strokes laser beam. These two mixed dyes have sufficient spectral band width and improved intensity to replace the traditional Rhodamine 575/601 dye and Rhodamine 640 dyes of an earlier dual-Strokes CARS instrument. The improved Pyromethene single Strokes CARS system has been used to obtain CARS spectra (CO, CO2, O2, N2) that allowed CARS temperature and species concentration measurements in a swirling, turbulent, premixed natural gas/air burner to be obtained.