A multiline-multiband absorption spectroscopy strategy is proposed and numerically studied in the present work to address the limited detection range of the conventional two-line thermometry. The new method utilizes the information and spectral characteristics of multiple transitions at multiple bands to derive temperature and species concentration. Various combinations of absorption lines are evaluated when measuring the combustion fields of a standard McKenna flame and a jet-in-hot-coflow flame. Results show that the proposed multiline-multiband absorption spectroscopy with the tomographic algorithm is effective in resolving the high-gradient region of the flames. Wide detection range and high accuracy are achieved simultaneously in the tomographic reconstructions of the thermochemical profiles. Using a 3-line scheme, the temperature and species profiles at the temperature range from 300 K to 2000 K are successfully reconstructed. The present study demonstrates the great potential of multiline-multiband absorption spectroscopy for flames with a high gradient region or a steep boundary layer.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.