School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Nov;74(4):924-7. doi: 10.1016/j.saa.2009.08.033. Epub 2009 Aug 19.
A new wavelength modulated photoacoustic spectrometer based on a near-infrared tunable erbium doped fiber laser (TEDFL) and an erbium doped fiber amplifier (EDFA) is first developed for trace gas detection. This sensor has been applied to the detection of ammonia using a first longitudinal resonant photoacoustic cell with double absorption optical path (L=20cm) and lock-in harmonic detection technique. The minimum detectable limit of 3 parts-per-billion volume (signal-to-noise ratio=1) and response time of approximately 1min is achieved at room temperature and atmospheric pressure with 100ms time constant and 500mW optical power at the 1531.7nm transition line.
首次研制了一种基于近红外可调谐掺铒光纤激光器（TEDFL）和掺铒光纤放大器（EDFA）的新型波长调制光声光谱仪，用于痕量气体检测。该传感器已应用于使用具有双吸收光路（L=20cm）的第一纵向共振光声池和锁相谐波检测技术检测氨。在室温常压下，使用 100ms 时间常数和 500mW 光功率在 1531.7nm 跃迁线处，可实现最小可检测限为 3 部分每十亿体积（信噪比=1）和约 1min 的响应时间。
