Department of Environmental Science and Technology, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology/4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan.
Sensors (Basel). 2010;10(7):6612-22. doi: 10.3390/s100706612. Epub 2010 Jul 9.
We have developed an efficient and compact 3.4 μm difference-frequency-generation spectrometer using a 1.55 μm distributed feedback (DFB) laser diode, a 1.06 μm DFB laser diode, and a ridge-waveguide periodically poled lithium niobate. It is continuously tunable in the 30 cm(-1) span and is applied to (12)CH(3)D/(12)CH(4) isotope ratio measurements. The suitable pair of (12)CH(3)D ν(4) (p)P(7,6) and (12)CH(4) ν(2)+ν(4) R(6) F(1)((1)) lines enabled us to determine their isotope ratio with a precision repeatability of 0.8‰ using a sample and a working standard of pure methane with an effective signal averaging time of 100 ms.
我们利用 1.55 μm 的分布式反馈（DFB）激光二极管、1.06 μm 的 DFB 激光二极管和脊形波导周期性极化铌酸锂，研制出了一种高效、紧凑的 3.4 μm 差频发生光谱仪。它在 30 cm(-1) 的范围内可以连续调谐，并应用于 (12)CH(3)D/(12)CH(4) 同位素比率测量。合适的 (12)CH(3)D ν(4) (p)P(7,6) 和 (12)CH(4) ν(2)+ν(4) R(6) F(1)((1)) 谱线对使我们能够在有效信号平均时间为 100 ms 的情况下，以 0.8‰的精度重复性，使用纯甲烷的样品和工作标准来确定它们的同位素比。
