A diode laser absorption sensor for rapid measurements of temperature and water vapor in a shock tube
Time-resolved measurements of gas temperature and water vapor concentration are made in a shock tube using a novel diode laser absorption sensor (100 kHz bandwidth). Gas temperature is determined from the ratio of fixed-wavelength laser absorption of two water vapor rovibrational transitions near 1.4 μ m, and H2O concentration is determined from the inferred temperature and the absorption for one of the transitions. Wavelength modulation spectroscopy is employed with second-harmonic detection to improve the sensor sensitivity. The sensor is validated in a static cell and shock tests with H$_2$O-Ar mixtures, yielding an overall accuracy of better than 1.9 % for temperature and 1.4 % for H2O concentration measurements over the range of 500-1700 K. The sensor is then demonstrated in a preliminary study of combustion in H2/O2/Ar and heptane/O2/Ar mixtures in the shock tube.
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- 1.Glassman I.: Combustion, 3rd edition (Academic Press, San Diego, CA 1996Google Scholar
- 4.Li H., Farooq A., Jeffries J.B., Hanson R.K.: In preparation.Google Scholar
- 5.Li H., Farooq A., Jeffries J.B., Hanson R.K.: submitted to J. Quant. Spectrosc. Radiat. Transfer.Google Scholar
- 7.GRI-Mech 3.0 http://www.me.berkeley.edu/gri-mech/, 1999.
- 8.Li H., Owens Z., Davidson D.F., Hanson R.K.: In preparation.Google Scholar