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Acousto-optically modulated quantum cascade laser for high-temperature reacting systems thermometry

Abstract

We demonstrate time-resolved temperature measurements in shock-heated mixtures of carbon monoxide over a temperature range of 1000–1800 K for two pressure ranges, 2.0–2.9 atm and 7.6–10.7 atm, at rates up to 250 kHz using a single acousto-optically modulated quantum cascade laser with mid-infrared output spanning from 1975 to 2260cm1. Measured temperatures were in excellent agreement with values determined by ideal shock relations, and the temperature profile after the passage of the reflected shock wave was found to be well-modeled by an isentropic compression assumption. Temperature measurements made with this setup are largely immune to effects of emissions and beam steering, making the diagnostic system well-suited for studying high-temperature gas-phase reactions of energetic materials such as octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine and hexahydro-1,3,5-trinitro-1,3,5-triazine.

© 2019 Optical Society of America

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