Premixed Methane-Air Flame Spectra Measurements Using UV Raman Scattering

Cheng, T. S.; Yuan, Tony; Chao, Yei-Chin; Lu, C.-C.; Wu, Der-Chyun

doi:10.1080/00102209808924150

Cited by 7 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Temperature determinations with this method are inaccurate because the exponential exp͑−ប v / k B T͒ is very sensitive to small changes in T. Although this method is not the preferred way to measure the temperature of a room, the example highlights the concept of measuring temperatures with a spectroscopic tool. Raman spectroscopy is one of the preferred options for temperature estimations and chemical sensing using a remote optical system and is very important in studying chemical reactions in flames or plasmas 17 and the temperature of mechanical parts that move at high speed ͑such as blades in turbines͒, 18 where it is impossible to attach a thermometer or an electronic sensor.…”

Section: Anti-stokes Raman Scatteringmentioning

confidence: 99%

High performance Raman spectroscopy with simple optical components

Somerville

Northcote

et al. 2010

American Journal of Physics

View full text Add to dashboard Cite

Several simple experimental setups for the observation of Raman scattering in liquids and gases are described. Typically these setups do not involve more than a small ͑portable͒ CCD-based spectrometer ͑without scanning͒, two lenses, and a portable laser. A few extensions include an inexpensive beam-splitter and a color filter. We avoid the use of notch filters in all of the setups. These systems represent some of the simplest but state-of-the-art Raman spectrometers for teaching/ demonstration purposes and produce high quality data in a variety of situations; some of them traditionally considered challenging ͑for example, the simultaneous detection of Stokes/anti-Stokes spectra or Raman scattering from gases͒. We show examples of data obtained with these setups and highlight their value for understanding Raman spectroscopy. We also provide an intuitive and nonmathematical introduction to Raman spectroscopy to motivate the experimental findings.

show abstract

Section: Anti-stokes Raman Scatteringmentioning

confidence: 99%

High performance Raman spectroscopy with simple optical components

Somerville

Northcote

et al. 2010

American Journal of Physics

View full text Add to dashboard Cite

show abstract

“…Therefore, in the present study, the application of a chemiluminescence sensor for multipoint local equivalence ratio measurements in a partially premixed flame is reported. Two Cassegrain mirror systems originally designed for Raman scattering measurements (Cheng et al, 1998b) are used to simultaneously detect C 2 Ã =OH Ã and OH Ã =CH Ã in laminar methane=air flames for calibration purposes. The calibration equations, which express the dependence of OH Ã =CH Ã and C 2 Ã =OH Ã ratios on the equivalence ratio, are then applied for local equivalence ratio measurements in a partially premixed swirling flame.…”

Section: Introductionmentioning

confidence: 99%

Chemiluminescence Measurements of Local Equivalence Ratio in a Partially Premixed Flame

Cheng

et al. 2006

Combustion Science and Technology

Self Cite

View full text Add to dashboard Cite

Spatially resolved, time-averaged, multipoint measurements of flame emission spectra using two Cassegrain mirrors and two spectrometers are performed and the results are used to obtain the correlation of the intensity ratio of OH Ã =CH Ã and C 2 Ã =OH Ã to the equivalence ratio in the laminar flames over an equivalence ratio range of 0.8-1.4. Results show that a strong correlation exists between the intensity ratio and equivalence ratio. The calibration equations obtained from the laminar flame measurements are then applied to obtain the local equivalence ratio in a partially premixed swirling flame. Experimental results demonstrate that multipoint measurement of local equivalence ratio in the partially premixed swirling methane flames is feasible. However, this non-laser based chemiluminescence technique can only be applied to determine the local flame stoichiometry in the reaction zone of the flames. Further improvement of the measurement system and possibility of simultaneous measurements of equivalence ratio and temperature are discussed.

show abstract