Design and performance of a sensor system for detection of multiple chemicals using an external cavity quantum cascade laser
Design and performance of a sensor system for detection of multiple chemicals using an external cavity quantum cascade laser
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使用外腔量子级联激光器检测多种化学品的传感器系统的设计和性能
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. L. Myers
中科院分区：
文献类型：
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作者：
M. Phillips;M. Taubman;B. Bernacki;B. Cannon;John T. Schiffern;T. L. Myers
我们描述了一个传感器系统的性能，该系统设计用于同时检测多种化学物质，具有宽吸收和窄吸收特性。该传感器系统包括一个广泛可调谐的外腔量子级联激光器（ECQCL），多通赫里奥特细胞，和定制的低噪声电子。ECQCL在1150-1270 cm-1（7.87-8.70 μm）范围内具有2265 cm-1/s（15660 nm/s）的快速波长调谐速率，可以检测具有宽吸收特征和动态浓度的分子，而ECQCL系统的0.2 cm-1光谱分辨率可以测量具有大气加宽吸收线的小分子。高速幅度调制和低噪声电子学被用来改善ECQCL性能的直接吸收测量。我们演示了氟利昂-134a（1，1，1，2-二氯乙烷），氨（NH3），一氧化二氮（N2 O）在低ppb浓度的现场测量大气中的化学品释放从点源的同时检测。
We describe the performance of a sensor system designed for simultaneous detection of multiple chemicals with both broad and narrow absorption features. The sensor system consists of a broadly tunable external cavity quantum cascade laser (ECQCL), multi-pass Herriott cell, and custom low-noise electronics. The ECQCL features a fast wavelength tuning rate of 2265 cm-1/s (15660 nm/s) over the range of 1150-1270 cm-1 (7.87-8.70 μm), which permits detection of molecules with broad absorption features and dynamic concentrations, while the 0.2 cm-1 spectral resolution of the ECQCL system allows measurement of small molecules with atmospherically broadened absorption lines. High-speed amplitude modulation and low-noise electronics are used to improve the ECQCL performance for direct absorption measurements. We demonstrate simultaneous detection of Freon-134a (1,1,1,2-tetrafluoroethane), ammonia (NH3), and nitrous oxide (N2O) at low-ppb concentrations in field measurements of atmospheric chemical releases from a point source.