Temperature measurement using ultraviolet laser absorption of carbon dioxide behind shock waves.

A diagnostic for microsecond time-resolved temperature measurements behind shock waves, using ultraviolet laser absorption of vibrationally hot carbon dioxide, is demonstrated. Continuous-wave laser radiation at 244 and 266 nm was employed to probe the spectrally smooth CO2 ultraviolet absorption, and an absorbance ratio technique was used to determine temperature. Measurements behind shock waves in both nonreacting and reacting (ignition) systems were made, and comparisons with isentropic and constant-volume calculations are reported.

[1]  B. Lewis,et al.  Temperature dependence of the carbon dioxide photoabsorption cross section between 1200 and 1970 Å , 1983 .

[2]  Ronald K. Hanson,et al.  Interpreting shock tube ignition data , 2004 .

[3]  R. Hanson,et al.  Temperature measurements in shock tubes using a laser-based absorption technique. , 1987, Applied optics.

[4]  R. Hanson,et al.  Ignition Delay Times of Ram Accelerator CH/O/Diluent Mixtures , 1999 .

[5]  J. Daily,et al.  A versatile modeling tool for nitric oxide LIF spectra , 2003 .

[6]  R. Hanson,et al.  Rapid tuning cw laser technique for measurements of gas velocity, temperature, pressure, density, and mass flux using NO. , 1991, Applied optics.

[7]  Ronald K. Hanson,et al.  Evaluation of pulse detonation engine modeling using laser-based temperature and OH concentration measurements , 2005 .

[8]  Ronald K. Hanson,et al.  Nonideal effects behind reflected shock waves in a high-pressure shock tube , 2001 .

[9]  M. Koshi,et al.  Photodissociation of O2 and CO2 from vibrationally excited states at high temperatures , 1991 .

[10]  J. Lyman,et al.  The ultraviolet absorption spectrum of hot carbon dioxide , 1997 .

[11]  R. Hanson,et al.  Continuous wave laser absorption techniques for gasdynamic measurements in supersonic flows. , 1991, Applied optics.

[12]  R. Hanson,et al.  UV absorption of CO2 for temperature diagnostics of hydrocarbon combustion applications , 2004 .

[13]  R. Hanson,et al.  Ultraviolet absorption spectra of shock-heated carbon dioxide and water between 900 and 3050 K , 2002 .

[14]  A. G. Gaydon,et al.  The shock tube in high-temperature chemical physics , 1963 .

[15]  Ronald K. Hanson,et al.  Laser diode wavelength-modulation spectroscopy for simultaneous measurement of temperature, pressure, and velocity in shock-heated oxygen flows. , 1993, Applied optics.

[16]  R. Hanson,et al.  Ultraviolet absorption cross-sections of hot carbon dioxide , 2004 .

[17]  M. Ogawa.  Absorption cross sections of O2 and CO2 continua in the Schumann and far-uv regions , 1971 .