公开(公告)号：US20150226665A1

公开(公告)日：2015-08-13

申请号：US14422924

申请日：2013-08-09

申请人： THE SCIENCE AND TECHNOLOGY FACILITIES COUNCIL

发明人： Damien Weidmann ,  Richard Brownsword

IPC分类号： G01N21/39 ,  G01N21/3504

CPC分类号： G01N21/39 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/3504 ,  G01N2021/396 ,  G01N2201/022 ,  G01N2201/06113

摘要： Method and apparatus for external cavity laser absorption spectroscopy There is disclosed an apparatus, and corresponding methods, for determining one or more characteristics of a sample in an absorption cell using laser absorption spectroscopy. For example, the characteristic may be concentration of a species in the sample. The apparatus comprises an external cavity semiconductor laser comprising a semiconductor gain medium within an optical resonator. The absorption cell is located within the optical resonator of the external cavity semiconductor laser so as to be optically coupled with the gain medium. A controller is arranged to provide a varied injection current to the semiconductor gain medium. A photodetector is arranged to detect laser light output by the external cavity semiconductor laser. An analyser is arranged to determine one or more characteristics of the sample from behaviour of the detected laser light output as a function of the varied injection current.

摘要翻译： 用于外腔激光吸收光谱的方法和装置公开了一种用于使用激光吸收光谱确定吸收单元中的样品的一个或多个特性的装置和相应的方法。 例如，特征可以是样品中物种的浓度。 该装置包括在光谐振器内包括半导体增益介质的外腔半导体激光器。 吸收单元位于外腔半导体激光器的光学谐振器内，以便与增益介质光耦合。 控制器被布置成向半导体增益介质提供变化的注入电流。 光检测器被布置成检测由外腔半导体激光器输出的激光。 分析器被布置成根据检测到的激光输出的行为来确定样品的一个或多个特性作为改变的注入电流的函数。

公开(公告)号：US09347878B2

公开(公告)日：2016-05-24

申请号：US14422924

申请日：2013-08-09

申请人： THE SCIENCE AND TECHNOLOGY FACILITIES COUNCIL

发明人： Damien Weidmann ,  Richard Brownsword

IPC分类号： G01N21/00 ,  G01N21/39 ,  G01J3/42 ,  G01N21/3504

CPC分类号： G01N21/39 ,  G01J3/42 ,  G01J2003/423 ,  G01N21/3504 ,  G01N2021/396 ,  G01N2201/022 ,  G01N2201/06113

摘要： Method and apparatus for external cavity laser absorption spectroscopy There is disclosed an apparatus, and corresponding methods, for determining one or more characteristics of a sample in an absorption cell using laser absorption spectroscopy. For example, the characteristic may be concentration of a species in the sample. The apparatus comprises an external cavity semiconductor laser comprising a semiconductor gain medium within an optical resonator. The absorption cell is located within the optical resonator of the external cavity semiconductor laser so as to be optically coupled with the gain medium. A controller is arranged to provide a varied injection current to the semiconductor gain medium. A photodetector is arranged to detect laser light output by the external cavity semiconductor laser. An analyzer is arranged to determine one or more characteristics of the sample from behavior of the detected laser light output as a function of the varied injection current.

摘要翻译： 用于外腔激光吸收光谱的方法和装置公开了一种用于使用激光吸收光谱法确定吸收单元中的样品的一个或多个特性的装置和相应的方法。 例如，特征可以是样品中物种的浓度。 该装置包括在光谐振器内包括半导体增益介质的外腔半导体激光器。 吸收单元位于外腔半导体激光器的光学谐振器内，以便与增益介质光耦合。 控制器被布置成向半导体增益介质提供变化的注入电流。 光检测器被布置成检测由外腔半导体激光器输出的激光。 分析器被布置成根据检测到的激光输出的行为来确定样品的一个或多个特性作为改变的注入电流的函数。