公开(公告)号：US4036557A

公开(公告)日：1977-07-19

申请号：US621709

申请日：1975-10-14

申请人： Craig M. Christensen

发明人： Craig M. Christensen

IPC分类号： G01P3/36 ,  G01P5/26 ,  G01S7/481 ,  G01S7/499 ,  G01S7/58 ,  G02B27/10

CPC分类号： G02B27/144 ,  G01P3/366 ,  G01P5/26 ,  G01S7/4812 ,  G01S7/499 ,  G01S7/58

摘要： A laser doppler velocimeter for measuring one or more velocity components of a moving material, fluid or solid, using a single set of optical focusing elements. A unique two component beam splitter provides multiple pairs of parallel beams, one pair from each input radiation beam from a given laser source.Each incident radiation input beam is separated by means of a selectively transmissive coating on one of the roof faces of an Amici prism into a first beam comprising substantially all of the polarized component parallel to the plane of incidence (P polarization) and one-half of the polarization component normal to the plane of incidence (S polarization), and a second beam comprising one-half of the S polarization component alone. At the measuring point, the two beams interfere, with the S components producing a differential doppler frequency superimposed on a non-doppler pedestal, while the P component contains only the non-doppler pedestal. The detector beam splitter directs the P polarization component to one radiation detector and the S polarization component to the remaining detector. The analog electrical equivalent signal to the optical P component signal is electrically subtracted from the electrical analog equivalent to the S component signal, the pedestal is removed, and this signal is divided by the P component signal to yield a signal having the pure doppler differential frequency information.The invention provides dual beam redundancy, extremely simple alignment, and two velocity measuring ranges.

摘要翻译： 激光多普勒测速仪，用于使用单组光学聚焦元件测量移动材料，流体或固体的一个或多个速度分量。 独特的双分量光束分离器提供多对平行光束，一对来自给定激光源的每个输入辐射束。

公开(公告)号：US4101199A

公开(公告)日：1978-07-18

申请号：US761833

申请日：1977-01-24

申请人： Craig M. Christensen

发明人： Craig M. Christensen

IPC分类号： G01P3/36 ,  G01P5/26 ,  G01S7/481 ,  G01S7/499 ,  G01S7/58 ,  G02B27/10 ,  G02B27/28

CPC分类号： G02B27/144 ,  G01P3/366 ,  G01P5/26 ,  G01S7/4812 ,  G01S7/499 ,  G01S7/58

摘要： A unique two component beam splitter for generating multiple pairs of parallel beams of coherent radiation from input beams, one pair from each input radiation beam from a given laser source. The input beam from each different source is incident to a different input face of the beam splitter and the polarization states of each beam in a given pair are related in a unique manner.Each incident radiation input beam is separated by means of a selectively transmissive coating on one of the roof faces of an Amici prism into a first beam comprising substantially all of the polarized component parallel to the plane of incidence (P polarization) and one-half of the polarization component normal to the plane of incidence (S polarization), and a second beam comprising one-half of the S polarization component alone.

摘要翻译： 一种独特的双分量分束器，用于从输入光束产生多对相干辐射的平行光束，一对来自给定激光源的每个输入辐射束。 来自每个不同源的输入光束入射到分束器的不同输入面，并且给定对中的每个光束的偏振状态以独特的方式相关。