公开(公告)号：US6091504A

公开(公告)日：2000-07-18

申请号：US82662

申请日：1998-05-21

申请人： Stephen D. Walker ,  Robert A. Nichols ,  William A. Curnan ,  Sophat Svai ,  James R. Braig ,  Daniel S. Goldberger

发明人： Stephen D. Walker ,  Robert A. Nichols ,  William A. Curnan ,  Sophat Svai ,  James R. Braig ,  Daniel S. Goldberger

IPC分类号： G01N21/39 ,  G01N21/00

CPC分类号： G01N21/39

摘要： A system and method for determining the concentration of an analyte such as oxygen in an unknown gas sample. A Vertical Cavity Surface Emitting Laser (VCSEL) is used as a variable wavelength light source which is "swept" through a wavelength range by varying the drive signal applied thereto. Quantitative spectroscopic analysis of the unknown gas sample is performed without the requirement of feedback circuitry for tuning the light source to the characteristic frequency of an analyte. Instead, the VCSEL is repeatedly "swept" through a range of frequencies determined by the drive signal, and the absorption is measured by the detector. The absorption lines do not always occur at the same place but instead move along around during the sweep based on the temperature and baseline current. The absorption at a particular wavelength may be determined by overlaying the drive signal and its timing information over the detected absorption signal.

摘要翻译： 用于确定未知气体样品中分析物如氧的浓度的系统和方法。 垂直腔面发射激光器（VCSEL）被用作通过改变施加到其上的驱动信号通过波长范围“扫过”的可变波长光源。 进行未知气体样品的定量光谱分析，而不需要用于将光源调谐到分析物的特征频率的反馈电路。 相反，VCSEL在由驱动信号确定的频率范围内被重复扫描，并且由检测器测量吸收。 吸收线并不总是发生在相同的位置，而是基于温度和基线电流在扫描过程中沿着周围移动。 可以通过将驱动信号及其定时信息覆盖在检测到的吸收信号上来确定特定波长处的吸收。