Jágerská Jana, Jouy Pierre, Tuzson Béla, Looser Herbert, Mangold Markus, Soltic Patrik, Hugi Andreas, Brönnimann Rolf, Faist Jérôme, Emmenegger Lukas
Opt Express. 2015 Jan 26;23(2):1512-22. doi: 10.1364/OE.23.001512.
The concept of a multi-wavelength quantum cascade laser emitting at two or more spectrally well-separated wavelengths is highly appealing for applied spectroscopy, as it allows detecting several species with compact and cost-efficient optical setups. Here we present a practical realization of such a dual-wavelength setup, which is based on a room-temperature quantum cascade laser emitting single-mode at 1600 cm and 1900 cm and is thus well-suited for simultaneous NO and NO detection. Operated in a time-division multiplexed mode, our spectrometer reaches detection limits of 0.5 and 1.5 ppb for NO and NO, respectively. The performance of the system is validated against the well-established chemiluminescence detection while measuring the NOx emissions on an automotive test-bench, as well as upon monitoring the pollution at a suburban site.
在两个或多个光谱上充分分离的波长处发射的多波长量子级联激光器的概念，对于应用光谱学极具吸引力，因为它能够使用紧凑且经济高效的光学装置检测多种物质。在此，我们展示了这种双波长装置的实际实现，它基于一台在室温下能在1600厘米和1900厘米处单模发射的量子级联激光器，因此非常适合同时检测一氧化氮（NO）和二氧化氮（NO₂）。以时分复用模式运行时，我们的光谱仪对NO和NO₂的检测限分别达到0.5和1.5 ppb。在汽车测试台上测量氮氧化物排放以及在郊区站点监测污染时，该系统的性能通过成熟的化学发光检测进行了验证。
