Absorption spectroscopy based high-speed oxygen concentration measurements at elevated gas temperatures

SENSORS AND ACTUATORS B-CHEMICAL

卷:293

Article

Jatana, Gurneesh S.¹  Perfetto, Anthony K.²  Geckler, Samuel C.²  Partridge, William P.¹ 

[1] Oak Ridge Natl Lab, Fuels Engines & Emiss Res Ctr, Oak Ridge, TN 37830 USA

[2] Cummins Inc, Columbus, IN USA

关键词: Oxygen;    Herriott-cell;    Absorption;    High-speed;    Water vapor;    High-temperature;   

DOI  :  10.1016/j.snb.2019.04.143

来源: Elsevier

【 摘 要 】

A sensor based on tunable diode laser absorption spectroscopy (TDLAS) has been developed for concentration measurements in high-temperature (up to 800 K) gas streams; while the sensor measures gas oxygen and water concentration, temperature and pressure, this work focuses on the challenges and solutions to transient oxygen measurement. A 760-nm diode laser was used to probe a pair of oxygen absorption transitions, and a Herriott cell based multi-pass arrangement was utilized to compensate for the extremely weak oxygen absorption as well as the high gas temperature. This mull-pass arrangement provides a 4297.4-mm absorption path length across a 76.2-mm diameter duct, and an O-2 detection limit ([O-2] where SNR =1) of ca. 0.1%. Laboratory validation of the HITRAN spectral parameters of the chosen absorption transitions was performed over a range of high temperatures and oxygen concentrations relevant to engine-exhaust applications. The insensitivity of the Herriott cell arrangement to vibrations and spatial temperature gradients was demonstrated. Results from applications to single- and mull-cylinder engine exhaust are presented and demonstrate the new sensor's ability to measure fast intra-cycle gas-property transients, and provide insights relevant to advancing internal-combustion-engine technology.

【 授权许可】

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