Application of a widely electrically tunable diode laser to chemical gas sensing with quartz-enhanced photoacoustic spectroscopy.
Application of a widely electrically tunable diode laser to chemical gas sensing with quartz-enhanced photoacoustic spectroscopy.
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DOI：
10.1364/ol.29.001837
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发表时间：
2004-08
期刊：
影响因子：
3.6
通讯作者：
D. Weidmann;A. Kosterev;F. Tittel;N. Ryan;D. McDonald
中科院分区：
文献类型：
--
作者：
D. Weidmann;A. Kosterev;F. Tittel;N. Ryan;D. McDonald
采用近红外半导体激光器作为可调谐光谱光源，利用样品光栅分布布拉格反射器实现了多组分化学传感。利用石英增强光声光谱在紧凑的气室中获得高的吸收灵敏度。监测CO2、H2O、C2 H2和NH3。实现了用于NH3检测的8 × 10（-9）cm（-1）W（-1）Hz（-1/2）的噪声等效灵敏度，其对应于10（6）体积中4.4份（ppmv）的NH3混合比，具有1-s的时间常数和气室中可用的5.2-mW光功率。
A near-infrared diode laser with sample-grating distributed Bragg reflectors was used as a widely tunable spectroscopic source for multispecies chemical sensing. Quartz-enhanced photoacoustic spectroscopy was utilized to obtain high absorption sensitivity in a compact gas cell. CO2, H2O C2H2, and NH3 were monitored. A noise equivalent sensitivity of 8 x 10(-9) cm(-1) W(-1) Hz(-1/2)for NH3 detection was achieved, which corresponds to a NH3 mixing ratio of 4.4 parts in 10(6) by volume (ppmv) with a 1-s time constant and available 5.2-mW optical power in the gas cell.