Laser absorption of nitric oxide for thermometry in high-enthalpy air
Laser absorption of nitric oxide for thermometry in high-enthalpy air
复制标题
高焓空气中一氧化氮的激光吸收测温
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
R. Hanson
中科院分区：
文献类型：
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作者：
R. Spearrin;I. A. Schultz;J. Jeffries;R. Hanson
介绍了用于高焓空气测温的激光吸收传感器的设计和演示。该传感器利用了化学平衡时空气中一氧化氮浓度对温度高度敏感且很大程度上与压力无关的特性。因此，温度是根据新生一氧化氮的原位测量来推断的。该策略是通过利用量子级联激光源来获得一氧化氮中红外光谱中的强基本吸收带而开发的。高压静态室中的室温测量验证了 Voigt 线形模型对高气体密度下一氧化氮光谱的适用性。激波管实验能够校准 1200–3000 K 温度范围内的碰撞展宽模型。最后，通过测量反射激波后面的温度，在高压激波管中展示传感器性能，用于接种一氧化氮的固定化学实验，以及涉及在 N2 和 O2 的激波加热混合物中形成一氧化氮的实验。结果表明，该传感器在 1100–2950 K 的各种工作条件和高达 140 atm 的压力下均具有出色的性能。
The design and demonstration of a laser absorption sensor for thermometry in high-enthalpy air is presented. The sensor exploits the highly temperature-sensitive and largely pressure-independent concentration of nitric oxide in air at chemical equilibrium. Temperature is thus inferred from an in situ measurement of nascent nitric oxide. The strategy is developed by utilizing a quantum cascade laser source for access to the strong fundamental absorption band in the mid-infrared spectrum of nitric oxide. Room temperature measurements in a high-pressure static cell validate the suitability of the Voigt lineshape model to the nitric oxide spectra at high gas densities. Shock-tube experiments enable calibration of a collision-broadening model for temperatures between 1200–3000 K. Finally, sensor performance is demonstrated in a high-pressure shock tube by measuring temperature behind reflected shock waves for both fixed-chemistry experiments where nitric oxide is seeded, and for experiments involving nitric oxide formation in shock-heated mixtures of N2 and O2. Results show excellent performance of the sensor across a wide range of operating conditions from 1100–2950 K and at pressures up to 140 atm.