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首页> 外文期刊>Applied optics >ASTIGMATIC MIRROR MULTIPASS ABSORPTION CELLS FOR LONG-PATH-LENGTH SPECTROSCOPY
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ASTIGMATIC MIRROR MULTIPASS ABSORPTION CELLS FOR LONG-PATH-LENGTH SPECTROSCOPY

机译：散光镜多通道吸收细胞，用于长路径光谱

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A multipass absorption cell, based on an astigmatic variant of the off-axis resonator (Herriott) configuration, has been designed to obtain long path lengths in small volumes. Rotation of the mirror axes is used to obtain an effective adjustability in the two mirror radii. This allows one to compensate for errors in mirror radii that are encountered in manufacture, thereby generating the desired reentrant patterns with less-precise mirrors. A combination of mirror rotation and separation changes can be used to reach a variety of reentrant patterns and path lengths with a fixed set of astigmatic mirrors. The accessible patterns can be determined from trajectories, as a function of rotation and separation, through a general map of reentrant solutions. Desirable patterns for long-path spectroscopy can be chosen on the basis of path length, distance of the closest beam spot from the coupling hole, and tilt insensitivity. We describe the mathematics and analysis methods for the astigmatic cell with mirror rotation and then describe the design and test of prototype cells with this concept. Two cell designs are presented, a cell with 100-m path length in a volume of 3 L and a cell with 36-m path length in a volume of 0.3 L. Tests of low-volume absorption cells that use mirror rotation, designed for fast-flow atmospheric sampling, show the validity and the usefulness of the techniques that we have developed. [References: 24]
机译：基于离轴谐振器（Herriott）配置的像散变体的多程吸收池已被设计为以小体积获得长路径长度。镜轴的旋转用于在两个镜半径上获得有效的可调节性。这样就可以补偿制造中遇到的反射镜半径误差，从而用较不精确的反射镜产生所需的凹角图案。可以使用反射镜旋转和间隔更改的组合，通过一组固定的散光镜来达到各种折返模式和光程长度。通过折返解的一般图，可根据轨迹从旋转和分离中确定可访问的模式。可以基于路径长度，离耦合孔最近的光束点的距离以及倾斜不敏感度来选择长距离光谱的理想图案。我们通过镜像旋转描述了散光像元的数学和分析方法，然后用这个概念描述了原型像元的设计和测试。提出了两种电池设计，一个路径长度为100 m的电池（容量为3 L）和一个路径长度为36 m的电池，容量为0.3L。使用镜面旋转的小容量吸收电池测试快速流动大气采样显示了我们开发的技术的有效性和实用性。 [参考：24]

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