公开(公告)号：US06172823B2

公开(公告)日：2001-01-09

申请号：US09488353

申请日：2000-01-20

申请人： Kevin K. Lehmann ,  Paul Rabinowitz

发明人： Kevin K. Lehmann ,  Paul Rabinowitz

IPC分类号： G02B504

CPC分类号： G01J3/42 ,  G01N21/39

摘要： A stable resonator for a ring-down cavity spectroscopy cell having an optic axis. The resonator includes two Brewster's angle retroreflector prisms, each having a plurality of total internal reflection surfaces, with one of the total internal reflection surfaces of at least one of the prisms having a curved surface (either a ground curved surface or a surface curved by the addition, through optically contacting or gluing, of a plano-convex lens to the surface). The prisms are disposed in alignment along the optic axis of the resonator. A spherical mirror or lens, tilted from normal incidence to produce a desired degree of astigmatism, mode matches the radiation into the resonator. One or both of the prisms can be rotated so that light rays enter and leave a surface of the prism nearly at Brewster's angle to the normal of the prism surface. This feature maintains alignment between the prisms and allows the resonator to be tuned.

摘要翻译： 用于具有光轴的环形腔光谱单元的稳定谐振器。 谐振器包括两个布鲁斯特角回射棱镜，每个具有多个全内反射表面，其中至少一个棱镜的全内反射表面之一具有弯曲表面（地面曲面或由 此外，通过将平凸透镜光学接触或胶合到表面）。 棱镜沿着谐振器的光轴对准设置。 从正常入射倾斜产生所需程度的散光的球面镜或透镜将辐射与谐振器相匹配。 棱镜中的一个或两个可以旋转，使得光线几乎以布鲁斯特角与棱镜表面的法线几乎进入并离开棱镜的表面。 该特征保持棱镜之间的对准并且允许调谐谐振器。

公开(公告)号：US6097555A

公开(公告)日：2000-08-01

申请号：US412069

申请日：1999-10-04

申请人： Kevin K. Lehmann ,  Paul Rabinowitz

发明人： Kevin K. Lehmann ,  Paul Rabinowitz

IPC分类号： G01N21/03 ,  G01J3/42 ,  G01N21/39 ,  G01N21/61 ,  G02B5/04 ,  G02B5/12 ,  G02B7/18 ,  G01J3/00 ,  G01N21/00 ,  H01S3/08

CPC分类号： G01J3/42 ,  G02B5/04 ,  G02B5/12

摘要： A stable resonator for a ring-down cavity spectroscopy cell having an optic axis. The resonator includes two Brewster's angle retroreflector prisms, each having a plurality of total internal reflection surfaces. The prisms are disposed in alignment along the optic axis of the resonator. One or both of the prisms can be rotated so that light rays enter and leave a surface of the prism nearly at Brewster's angle to the normal of the prism surface. This feature maintains alignment between the prisms and allows the resonator to be tuned. One of the total internal reflection surfaces of at least one of the prisms may be a curved surface (either a ground curved surface or a surface curved by the addition, through optically contacting or gluing, of a plano-convex lens to the surface). Alternatively, an astigmatic lens may be centered in one arm of the resonator and tilted at Brewster's angle with respect to the optic axis of the resonator. In a preferred embodiment, each of the prisms has an apex angle of about 135.degree. minus Brewster's angle, a second angle of about 90.degree., and a third angle of about 135.degree. minus two times Brewster's angle.

摘要翻译： 用于具有光轴的环形腔光谱单元的稳定谐振器。 谐振器包括两个布鲁斯特角回射棱镜，每个具有多个全内反射面。 棱镜沿着谐振器的光轴对准设置。 棱镜中的一个或两个可以旋转，使得光线几乎以布鲁斯特角相对于棱镜表面的法线进入和离开棱镜的表面。 该特征保持棱镜之间的对准并且允许调谐谐振器。 至少一个棱镜的全部内部反射表面中的一个可以是弯曲表面（地面曲面或通过平凸凸透镜通过光学接触或胶合到表面的曲线而弯曲的表面）。 或者，散光透镜可以在谐振器的一个臂中居中并相对于谐振器的光轴以布鲁斯特角倾斜。 在一个优选实施例中，每个棱镜具有大约135度的顶角减去布鲁斯特角，约90度的第二角度和约135度的第三角度减去布鲁斯特角的两倍。

公开(公告)号：US5528040A

公开(公告)日：1996-06-18

申请号：US335052

申请日：1994-11-07

申请人： Kevin K. Lehmann

发明人： Kevin K. Lehmann

IPC分类号： G01J3/42 ,  G01N21/39 ,  G01N21/17

CPC分类号： G01N21/39 ,  G01J3/42 ,  G01N2021/391

摘要： An apparatus for detection and measurement of trace species in a sample gas. A ring down cavity cell is filled with the sample gas. A continuous wave laser emits radiation, which is directed from the continuous wave laser to the ring down cavity cell where it resonates. A photodetector measures radiation levels resonated by the ring down cavity cell and produces a corresponding signal. The decay rate of the ring down cavity cell is calculated from the signal produced by the photodetector and is used to determine the level of trace species in the sample gas.

摘要翻译： 用于检测和测量样品气体中痕量物质的装置。 环形空腔充满样品气体。 连续波激光器发射辐射，其从连续波激光器引导到其共振的环下腔室。 光电检测器测量由环形腔单元谐振的辐射水平并产生相应的信号。 环形腔室的衰减速率由光电检测器产生的信号计算，并用于确定样品气体中微量物质的含量。

公开(公告)号：US07504068B2

公开(公告)日：2009-03-17

申请号：US11390231

申请日：2006-03-27

申请人： Kevin K. Lehmann ,  Peter B. Tarsa ,  Paul Rabinowitz

发明人： Kevin K. Lehmann ,  Peter B. Tarsa ,  Paul Rabinowitz

IPC分类号： G01N33/00

CPC分类号： G01N21/39 ,  G01J3/42 ,  G01N21/552 ,  G01N2021/391 ,  G01N2021/7789

摘要： An apparatus for detection and measurement of trace species in a gas or liquid sample. A sensor of a ring down cell formed from an optical fiber is exposed to the sample gas or liquid. A coherent source emits radiation into the optical fiber loop, which in turn is received at an output coupler. The fiber optic ring is coupled to a sensor which has a portion thereof, between the input and output, exposed to the sample gas or sample liquid. The sensor has an enhanced evanescent region. A processor is coupled to the receiver and determines the level of trace species in the gas or liquid sample based on the rate of decay of the radiation within the fiber optic ring.

摘要翻译： 用于检测和测量气体或液体样品中微量物质的装置。 由光纤形成的环形电池的传感器暴露于样品气体或液体。 相干光源将辐射发射到光纤回路中，光纤回路又在输出耦合器处接收。 光纤环耦合到传感器，该传感器具有在输入和输出之间暴露于样品气体或样品液体中的一部分。 传感器具有增强的渐逝区域。 处理器耦合到接收器，并且基于光纤环内的辐射衰减速率来确定气体或液体样品中痕量物质的水平。