Abstract

The development and demonstration of a tunable diode laser (TDL) absorption sensor for temperature measurements in high-pressure and high-temperature gases is presented. This sensor uses a wavelength modulation spectroscopy with second-harmonic detection (WMS-2f) technique with a sensor bandwidth of 10 kHz. Two-color thermometry was performed using water vapor absorption features near 1392 and 1469 nm. Sensor performance was validated with measurements in a heated static cell and shock-heated N2-H2O mixtures in the Stanford High-Pressure Shock Tube (HPST). Experiments were conducted at gas temperatures and pressures between 600-2200 K and 2-22 atm, respectively.

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