• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >A non-scanning Fourier transform spectrometer utilizing a Wollaston prism array.
【24h】

A non-scanning Fourier transform spectrometer utilizing a Wollaston prism array.

机译：利用Wollaston棱镜阵列的非扫描傅立叶变换光谱仪。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new non-scanning Fourier transform (NSFT) spectrometer design has been demonstrated. It is an improvement over a previous design that employs a single Wollaston prism with a linear detector array. Spectrometers based on this design will have the potential to achieve higher optical throughput than grating spectrometers, superior S/N ratio than infrared grating instruments, shorter measurement times than scanning Fourier transform (SFT) spectrometers, and finer resolution than current Wollaston prism designs. Such spectrometers will find important applications in remote sensing, environmental monitoring, industrial processing control, and medical diagnosis.; The previous design consists of a Wollaston prism placed between two suitably oriented polarizees. Light is collimated and then polarized at 45° with respect to the optical axis of the first birefringent wedge of the prism. The analyzer is oriented at 45° with respect to the optical axis of either birefringent wedge. The Wollaston prism induces a linearly varying optical path difference upon the two orthogonal beams of light across the aperture of the prism forming a spatial interferogram on its output side. This interferogram is then imaged onto a linear detector array. With some data processing and a Fourier transformation of the interferogram, the spectrum of the light that entered the spectrometer can be obtained. Current NSFT spectrometers utilizing Wollaston prisms have poor resolution due to the small path difference range that can be induced across the finite aperture of the Wollaston prism. So far, NSFT spectrometers employing Wollaston prisms are used exclusively as laboratory tools.; The design proposed for the new NSFT spectrometer employs a two-dimensional detector array and a multiple number of Wollaston prisms called sub-prisms. Each sub-prism provides a different range of optical path difference and they are designed in such a way that an optical path difference range from one sub-prism partially overlaps the optical path difference range in the next. The union of these ranges forms an equivalent optical path difference range for one long fictional Wollaston prism. The set of sub-prisms is called the Wollaston prism array (WPA). Each sub-prism in the array must be fabricated separately and cemented together to form the array. In conjunction with the two-dimensional detector array, a superior resolution can be achieved to realize a marketable instrument.; To enable the NSFT spectrometer based upon the proposed design function, four technical issues were solved. These were, (1) manufacturing defects compensation, (2) interferogram fusion, (3) dispersion compensation, and (4) spectral compensation. Camera calibration was not an issue for this study since the imaging lens was highly corrected for geometric and chromatic aberrations and the object and image distances are on the order of meters. (Abstract shortened by UMI.)
机译：已经证明了一种新的非扫描傅立叶变换（NSFT）光谱仪设计。它是对先前设计的一种改进，该设计采用了带有线性检测器阵列的单个沃拉斯顿棱镜。基于这种设计的光谱仪将有可能实现比光栅光谱仪更高的光通量，比红外光栅仪器更高的信噪比，比扫描傅立叶变换（SFT）光谱仪更短的测量时间以及比当前的Wollaston棱镜设计更高的分辨率。这种光谱仪将在遥感，环境监测，工业过程控制和医疗诊断中找到重要的应用。先前的设计由放置在两个适当定向的偏振之间的沃拉斯顿棱镜组成。使光准直，然后相对于棱镜的第一双折射楔的光轴以45°偏振。分析仪相对于任一双折射楔的光轴成45°角。沃拉斯顿棱镜在穿过棱镜孔径的两个正交光束上产生线性变化的光程差，从而在其输出侧形成空间干涉图。然后将该干涉图成像到线性检测器阵列上。通过一些数据处理和干涉图的傅立叶变换，可以获得进入光谱仪的光的光谱。当前的利用沃拉斯顿棱镜的NSFT光谱仪的分辨力差，这是因为在沃拉斯顿棱镜的有限孔径上会产生小的光程差范围。到目前为止，采用沃拉斯顿棱镜的NSFT光谱仪仅用作实验室工具。为新的NSFT光谱仪提出的设计采用了二维检测器阵列和多个称为次棱镜的Wollaston棱镜。每个子棱镜提供不同范围的光程差，并且它们被设计为使得来自一个子棱镜的光程差范围与下一个子棱镜的光程差范围部分重叠。这些范围的并集形成一个虚构的沃拉斯顿棱镜的等效光程差范围。子棱镜的集合称为Wollaston棱镜阵列（WPA）。阵列中的每个子棱镜必须单独制造并粘合在一起以形成阵列。结合二维检测器阵列，可以实现较高的分辨率，从而实现可销售的仪器。为了基于所提出的设计功能启用NSFT光谱仪，解决了四个技术问题。它们是（1）制造缺陷补偿，（2）干涉图融合，（3）色散补偿和（4）光谱补偿。由于对成像镜头的几何和色差进行了高度校正，并且物镜和图像距离在米的数量级上，因此相机校准对于本研究而言不是问题。 （摘要由UMI缩短。）

著录项

  • 作者

    Komisarek, Daniel Phillip.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号