发明授权
- 专利标题: Optical quadrature Interferometer
- 专利标题(中): 光学正交干涉仪
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申请号: US985691申请日: 1997-12-05
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公开(公告)号: US6020963A公开(公告)日: 2000-02-01
- 发明人: Charles A. DiMarzio
- 申请人: Charles A. DiMarzio
- 申请人地址: MA Boston
- 专利权人: Northeastern University
- 当前专利权人: Northeastern University
- 当前专利权人地址: MA Boston
- 主分类号: G01B9/02
- IPC分类号: G01B9/02 ; G01N21/47
摘要:
An optical quadrature interferometer is presented. The optical quadrature interferometer uses a different state of polarization in each of two arms of the interferometer. A light beam is split into two beams by a beamsplitter, each beam directed to a respective arm of the interferometer. In one arm, the measurement arm, the light beam is directed through a linear polarizer and a quarter wave plate to produce circularly polarized light, and then to a target being measured. In the other arm, the reference arm, the light beam is not subject to any change in polarization. After the light beams have traversed their respective arms, the light beams are combined by a recombining beamsplitter. As such, upon the beams of each arm being recombined, a polarizing element is used to separate the combined light beam into two separate fields which are in quadrature with each other. An image processing algorithm can then obtain the in-phase and quadrature components of the signal in order to construct an image of the target based on the magnitude and phase of the recombined light beam. The system may further be used for lensless imaging.