A comparison of pulsed and continuous lasers for high-temperature Raman measurements of anhydrite
Abstract
Abstract Oxygen carrier particles (OCPs) serve as fuel oxidant in emerging chemical looping combustion systems. However, chemical looping combustion process optimization is hindered by the lack of online sensors for measurements of OCP oxidation states at temperatures up to 1,000 °C and pressures up to 10 atm. We are investigating Raman spectroscopy as a potential solution, as this technique is known for its ability to provide noninvasive, molecularly specific information in real time in a wide variety of applications. As a case study, Raman spectra from high‐temperature (>1,000 °C) anhydrite, a potential OCP, are presented using pulsed and continuous wave excitation at 532 nm. When pulsed excitation is coupled with time‐gated detection, background signal from thermal radiation can be significantly reduced from single pulse spectra, outperforming results using an ungated detector. Also, laser heating of the sample is not observed but laser‐induced breakdown spectra increasingly appear with increasing temperature and pulse intensity. Compared with pulsed excitation, continuous wave excitation with longer acquisition time, offers higher signal to noise and avoids the risk for laser‐induced breakdown spectra but demonstrates minor sample heating. Finally, the data demonstrate practical utility by (a) providing a calibration of anhydrite's ν 1 (1,017 cm −1 ) Raman temperature‐dependent band position andmore »
- Authors:
-
- Washington State Univ., Spokane, WA (United States)
- Publication Date:
- Research Org.:
- Washington State Univ., Pullman, WA (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1782241
- Alternate Identifier(s):
- OSTI ID: 1422839
- Grant/Contract Number:
- FE0027840
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Raman Spectroscopy
- Additional Journal Information:
- Journal Volume: 49; Journal Issue: 5; Journal ID: ISSN 0377-0486
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 20 FOSSIL-FUELED POWER PLANTS; 47 OTHER INSTRUMENTATION; calcium sulfate; high temperature; laser heating; pulsed laser; time gating
Citation Formats
Kirtley, John, Leichner, Victoria, Anderson, Benjamin R., and Eilers, Hergen. A comparison of pulsed and continuous lasers for high-temperature Raman measurements of anhydrite. United States: N. p., 2018.
Web. doi:10.1002/jrs.5356.
Kirtley, John, Leichner, Victoria, Anderson, Benjamin R., & Eilers, Hergen. A comparison of pulsed and continuous lasers for high-temperature Raman measurements of anhydrite. United States. https://doi.org/10.1002/jrs.5356
Kirtley, John, Leichner, Victoria, Anderson, Benjamin R., and Eilers, Hergen. Tue .
"A comparison of pulsed and continuous lasers for high-temperature Raman measurements of anhydrite". United States. https://doi.org/10.1002/jrs.5356. https://www.osti.gov/servlets/purl/1782241.
@article{osti_1782241,
title = {A comparison of pulsed and continuous lasers for high-temperature Raman measurements of anhydrite},
author = {Kirtley, John and Leichner, Victoria and Anderson, Benjamin R. and Eilers, Hergen},
abstractNote = {Abstract Oxygen carrier particles (OCPs) serve as fuel oxidant in emerging chemical looping combustion systems. However, chemical looping combustion process optimization is hindered by the lack of online sensors for measurements of OCP oxidation states at temperatures up to 1,000 °C and pressures up to 10 atm. We are investigating Raman spectroscopy as a potential solution, as this technique is known for its ability to provide noninvasive, molecularly specific information in real time in a wide variety of applications. As a case study, Raman spectra from high‐temperature (>1,000 °C) anhydrite, a potential OCP, are presented using pulsed and continuous wave excitation at 532 nm. When pulsed excitation is coupled with time‐gated detection, background signal from thermal radiation can be significantly reduced from single pulse spectra, outperforming results using an ungated detector. Also, laser heating of the sample is not observed but laser‐induced breakdown spectra increasingly appear with increasing temperature and pulse intensity. Compared with pulsed excitation, continuous wave excitation with longer acquisition time, offers higher signal to noise and avoids the risk for laser‐induced breakdown spectra but demonstrates minor sample heating. Finally, the data demonstrate practical utility by (a) providing a calibration of anhydrite's ν 1 (1,017 cm −1 ) Raman temperature‐dependent band position and by (b) providing estimates of temperature using the ratios of the Stokes/anti‐Stokes ν 1 integrated intensities. These results demonstrate the first high‐temperature, pulsed Raman spectra from anhydrite while evaluating challenges associated with high‐temperature, Raman measurements of OCP materials in general.},
doi = {10.1002/jrs.5356},
journal = {Journal of Raman Spectroscopy},
number = 5,
volume = 49,
place = {United States},
year = {Tue Feb 27 00:00:00 EST 2018},
month = {Tue Feb 27 00:00:00 EST 2018}
}
Web of Science
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